SIST EN IEC 61851-23-3:2026

• Abstract:

  This part of IEC 61851 applies to the EV supply equipment to provide energy transfer between the supply network and electric vehicles (EVs), with a rated maximum voltage at side A (supply network side) up to 1 000 V AC or up to 1 500 V DC and a rated maximum voltage at side B (EV side) up to 1 250 V DC.; NOTE A rated maximum voltage of the EV supply equipment at side B of up to 1 500 V DC is under consideration.; This document specifies the EV supply equipment of megawatt charging system (MCS) equipped with a coupler according to IEC TS 63379. Systems different to MCS using a coupler specified in IEC TS 63379 are under consideration.; The requirements for bidirectional power flow systems are under consideration.; This document does not cover all safety aspects related to maintenance.; This document specifies systems with protective separation between side A and side B.; The requirements for digital communication between the EV supply equipment and the EV for control of energy transfer are defined in ISO 15118-10 and ISO 15118-20.; EV supply equipment in compliance with this document is not intended to provide energy transfer to a single EV using; – multiple vehicle connectors of the same EV supply equipment, or; – multiple EV supply equipment.; The requirements for such use cases are not specified in this document but are under consideration.; The requirements for EVs mated to EV supply equipment according to this document are specified in ISO 5474-3:2024, Annex B.

• Status: Published
• Public Enquiry End Date: 30-Mar-2025
• Publication Date: 08-Nov-2026
• ICS: 43.120 - Electric road vehicles
• Technical Committee: CEV - Electric passenger and commercial vehicles
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Nov-2026
• Due Date: 08-Jan-2027
• Completion Date: 09-Nov-2026
• Directive: 2014/94/EU - Directive 2014/94/EU of The European Parliament and of The Council of 22 October 2014 on the deployment of alternative fuels infrastructure
• Directive:

  ---

  2023/1804 - Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
• Directive:

  ---

  2023/1804-2 - Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
• Mandate: M/581 - Standardisation Request as regards communication exchange, electricity, and hydrogen supply for road, maritime transport and inland navigation in support of Directive 2014/94/EU and its planned revision under the ‘Fit for 55’package
• Ref Project: EN IEC 61851-23-3:2026 - Electric vehicle conductive charging system - Part 23-3: DC electric vehicle supply equipment - Megawatt charging systems

• Refers: SIST HD 60364-5-54:2011 - Low-voltage electrical installations -- Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
• Effective Date: 29-Sep-2026
• Refers: SIST EN IEC 61851-23:2026 - Electric vehicle conductive charging system - Part 23: DC electric vehicle supply equipment
• Effective Date: 29-Sep-2026
• Refers: SIST HD 60364-4-43:2023 - Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent (IEC 60364-4-43:2023)
• Effective Date: 29-Sep-2026
• Refers: SIST EN ISO 15118-20:2022 - Road vehicles - Vehicle to grid communication interface - Part 20: 2nd generation network layer and application layer requirements (ISO 15118-20:2022)
• Effective Date: 29-Sep-2026
• Refers: SIST EN ISO 15118-10:2025 - Road vehicles - Vehicle to grid communication interface - Part 10: Physical layer and data link layer requirements for single-pair Ethernet (ISO 15118-10:2025)
• Effective Date: 29-Sep-2026
• Refers: SIST EN ISO 15118-20:2022/A1:2026 - Road vehicles - Vehicle to grid communication interface - Part 20: 2nd generation network layer and application layer requirements - Amendment 1: AC DER service, MCS service, and improved security concept (ISO 15118-20:2022/Amd 1:2026)
• Effective Date: 23-Sep-2026

SIST EN IEC 61851-23-3:2026 is the Slovenian standard for DC electric vehicle supply equipment used in megawatt charging systems. It specifies the equipment that transfers energy between the supply network and an electric vehicle, with protective separation between side A and side B, and with digital communication for control of the energy transfer.

This standard is aimed at designers, manufacturers, test laboratories, operators, buyers and conformity teams that need a common technical basis for megawatt DC charging equipment. It focuses on the EV supply equipment side of the system and ties that equipment to the coupler, communication and vehicle-side requirements used with it.

What does SIST EN IEC 61851-23-3:2026 specify?

SIST EN IEC 61851-23-3:2026 specifies DC EV supply equipment for Megawatt Charging System (MCS) applications. It applies to equipment with a rated maximum voltage at side A up to 1 000 V AC or 1 500 V DC, and at side B up to 1 250 V DC.

The document is organized as a part of IEC 61851 and is read together with IEC 61851-1:2017 and IEC 61851-23:2023. It adds or replaces requirements for system MCS, and it also introduces new clauses numbered from 201 and new annexes with triple-letter designations to avoid confusion with earlier parts.

Annex	What it covers
Annex AA	EV supply equipment of System A - marked not applicable
Annex BB	EV supply equipment of System B - marked not applicable
Annex CC	EV supply equipment of system MCS
Annex DD	Bidirectional power transfer control
Annex EE	Test load impedance verification
Annex FF	Multi-side B separated EV supply equipment
Annex GG	Communication and energy transfer process between the EV supply equipment and EV
Annex HH	Touch current and touch impulse current

What are the key requirements of SIST EN IEC 61851-23-3:2026?

SIST EN IEC 61851-23-3:2026 builds on the general EV charging framework and then narrows it to MCS-specific power, communication, protection and test requirements. In practice, the standard tells you what the equipment must do during charging, how it must react to faults, and how compliance is checked.

Power, voltage and system classification

Clause 4 sets the main operating expectations for side B power delivery. For higher-current equipment, the document requires the equipment to supply its rated continuous current or rated continuous power across the stated voltage ranges, so the charger has to be designed for the intended MCS operating window, not just for a nominal voltage.

Clause 5 classifies the equipment as System MCS. This matters because the rest of the document uses that system classification when selecting the correct construction, communication and test requirements.

Mandatory Mode 4 functions

Clause 6.3.1 lists the functions the EV supply equipment shall provide in Mode 4. These include continuity checking of the protective conductor, verification that the EV is properly connected, energization and de-energization of the power supply, current limiting, voltage and current measurement, latching, compatibility check, insulation resistance check, overvoltage protection, short-circuit check, user-initiated shutdown and shutdown of the EV supply equipment.

Clause 6.3.1 also says that if the equipment can supply more than one vehicle at the same time, each connector shall provide these functions independently. That is important for system design because each outlet has to be treated as a full charging path, not as a shared afterthought.

Overvoltage, shutdown and safety reaction times

Clause 6.3.1.106 sets the response to overvoltage between DC+ and DC-. If the present voltage stays above the relevant threshold for the required time, the equipment shall trigger an emergency shutdown within 1 ms or less. The standard gives voltage thresholds by negotiated maximum voltage, so the protection setting must match the actual operating range.

Clause 6.3.1.112 limits the voltage between side B live parts and the protective conductor during normal operation. The document also allows only short, infrequent deviations due to disturbances and points to passive or active balancing techniques to reduce touch impulse current. In practice, this means designers have to control the common-mode behavior of the system, not just the DC output voltage.

Clause 6.3.1.113 covers shutdown of the EV supply equipment and is tied to the safe return of side B to a low-voltage condition. This is central for maintenance, servicing and fault handling because the system must reach a safe state after shutdown.

Communications and control

Clause 7 requires digital communication between the EV supply equipment and the EV, and Annex CC gives the MCS-specific communication requirements. The basic interface uses the charge enable function and insertion detection function, and the MCS communication channel is based on 10BASE-T1S with ISO 15118-10 and ISO 15118-20 as the communication basis.

Annex CC says the EV supply equipment shall use PHY1 and PHY2 contacts for the digital communication line, and it defines the channel as a multidrop network with impedance, insertion loss, return loss and mode-conversion limits. This matters because the power system and the data link must work together reliably during startup, charging, pause, renegotiation and shutdown.

Thermal management and cable heating

Clause 101.2 covers energy transfer with a thermal management system or thermal sensing only. The EV supply equipment shall continuously monitor temperature data from the DC contacts during the communication session, and it shall react if the contacts overheat.

The standard also gives test conditions for thermal stabilization, reference devices and modified reference devices. In practice, this section is about making sure the connector and cable assembly can carry megawatt-level current without overheating or failing to react to a thermal sensor or fuse.

Test methods and compliance checking

Clause 102 gives the test methods, and Annex CC contains the detailed test cases for system MCS. These include startup, shutdown, emergency shutdown, pause, renegotiation, compatibility checking, overvoltage protection, insertion detection fault handling, load dump, inrush current limiting, cable-check and welding-detection related tests.

The practical effect is that compliance is not only about design intent. The document gives a reproducible way to verify the charger behavior on a test setup with an EV simulator, a defined test load and specific timing and measurement points.

What terms does SIST EN IEC 61851-23-3:2026 define?

• Charge enable conductor (CE) - the conductor in the cable assembly that, together with the protective conductor, forms part of the charge enable circuit.
• Insertion detection function (ID) - the means used to indicate whether the vehicle connector or EV plug is inserted.
• System MCS - the MCS charging system used throughout Annex CC and the related performance and test requirements.
• SECC - the supply equipment communication controller, used in the communication diagrams for the EV supply equipment.
• EVCC - the electric vehicle communication controller, used on the vehicle side in the communication sequence.
• Protective conductor - the conductor used for protective earthing and safety-related voltage control.
• EV supply equipment - the charging equipment that transfers energy from the supply network to the EV.
• Vehicle coupler - the connector interface used between the EV supply equipment and the EV, specified for this application by IEC TS 63379.

Who uses SIST EN IEC 61851-23-3:2026?

SIST EN IEC 61851-23-3:2026 is used by manufacturers of megawatt DC charging equipment, system integrators, vehicle and connector engineers, and test laboratories. It is also relevant for safety engineers, certification bodies, infrastructure operators and procurement teams that need to specify or verify high-power charging equipment.

It is particularly useful where the charger, coupler, communication channel and vehicle-side behavior must be designed together. The standard gives those teams a shared technical reference for interoperability, protection and test planning.

Which standards are used with SIST EN IEC 61851-23-3:2026?

Standard	What it contributes
IEC 61851-1:2017	General EV conductive charging requirements that remain applicable unless modified
IEC 61851-23:2023	The base part this document supplements and modifies
IEC TS 63379:202X	Vehicle connector, vehicle inlet and cable assembly for megawatt DC charging
ISO 15118-10:202X	Physical layer and data link layer requirements for wired Ethernet communication
ISO 15118-20:2022	Network layer and application layer requirements for the communication session
ISO 15118-20:2022/AMD1:202X	Amendment used in the MCS communication sequences
IEEE 802.3-2022	Ethernet physical-layer requirements used for the 10BASE-T1S channel
Open Alliance requirements for 10BASE-T1S link segments	Channel, component and compliance checking requirements for the physical communication link
ISO 5474-3:2024, Annex B	Vehicle-side requirements for EVs mated to this type of EV supply equipment

What does the SIST EN IEC 61851-23-3:2026 document contain?

The document contains the full structure needed to define, build and verify an MCS DC charging system. It includes a scope, normative references, terms and definitions, general requirements, classification, charging mode functions, communications, electric shock protection, conductive interface requirements, cable assembly requirements, constructional requirements, overload and short-circuit protection, automatic reclosing, marking, and specific MCS requirements.

Annex CC is the core technical annex. It provides the circuit diagrams, communication states, startup and shutdown sequences, emergency shutdown behavior, pause and restart methods, compatibility checks, safety-related functions, and detailed test cases for MCS.

The document also includes test setups, test loads, operating points, response sequences and measurement-related figures and tables. Those parts are used for design verification, type testing and fault-behavior assessment of the EV supply equipment.

Annex EE supports test-load impedance verification, Annex FF covers multi-side B separated EV supply equipment, and Annex HH gives additional touch current and touch impulse current information. Together, these annexes show how the standard moves from general charging principles to a specific MCS implementation and its verification.

SLOVENSKI STANDARD
01-december-2026
Sistem kabelskega napajanja električnih vozil - 23-3. del: Postaja za kabelsko
napajanje električnega vozila z enosmernim tokom - Megavatni napajalni sistemi
(IEC 61851-23-3:2026)
Electric vehicle conductive charging system - Part 23-3: DC electric vehicle supply
equipment - Megawatt charging systems (IEC 61851-23-3:2026)
Konduktive Ladesysteme für Elektrofahrzeuge - Teil 23-3:
Gleichstromversorgungseinrichtungen für Elektrofahrzeuge - Megawatt-Ladesysteme
(IEC 61851-23-3:2026)
Système de charge par conduction pour véhicules électriques - Partie 23-3: Système
d’alimentation en courant continu pour véhicules électriques - Système de recharge
mégawatt (IEC 61851-23-3:2026)
Ta slovenski standard je istoveten z: EN IEC 61851-23-3:2026
ICS:
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61851-23-3

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2026
ICS 43.120
English Version
Electric vehicle conductive charging system - Part 23-3: DC
electric vehicle supply equipment - Megawatt charging systems
(IEC 61851-23-3:2026)
Système de charge par conduction pour véhicules Konduktive Ladesysteme für Elektrofahrzeuge - Teil 23-3:
électriques - Partie 23-3: Système d'alimentation en courant Gleichstromversorgungseinrichtungen für Elektrofahrzeuge
continu pour véhicules électriques - Système de recharge - Megawatt-Ladesysteme
mégawatt (IEC 61851-23-3:2026)
(IEC 61851-23-3:2026)
This European Standard was approved by CENELEC on 2026-09-25. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61851-23-3:2026 E

European foreword
The text of document 69/1132/FDIS, future edition 1 of IEC 61851-23-3, prepared by TC 69 "Electrical
power/energy transfer systems for electrically propelled road vehicles and industrial trucks" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61851-23-
3:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-10-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 61851-1:2019 and EN IEC 61851-23:2026.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61851-23-3:2026 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60664-1:2020 NOTE Approved as EN IEC 60664-1:2020 (not modified)
Approved as EN IEC 60664-1:2020/A1:2025 (not
IEC 60664-1:2020/AMD1:2025 NOTE
modified)
IEC 61851-23:2014 NOTE Approved as EN 61851-23:2014 (not modified)
IEC 61851-23 NOTE Approved as EN 61851-23
IEC 61851-24 NOTE Approved as EN IEC 61851-24
IEC 62196-3 NOTE Approved as EN IEC 62196-3
IEC 62477-1:2022 NOTE Approved as EN IEC 62477-1:2023 (not modified)
ISO 15118-2:2014 NOTE Approved as EN ISO 15118-2:2016 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60364-4-43 2023 Low-voltage electrical installations - Part 4- HD 60364-4-43 2023
43: Protection for safety - Protection
against overcurrent
IEC 60364-5-54 2011 Low-voltage electrical installations - Part 5- HD 60364-5-54 2011
54: Selection and erection of electrical
equipment - Earthing arrangements and
protective conductors
- - + A11 2017
IEC 61851-23 2023 Electric vehicle conductive charging EN IEC 61851-23 2026
system - Part 23: DC electric vehicle
supply equipment
IEC/TS 63379 2026 Vehicle connector, vehicle inlet and cable - -
assembly for megawatt DC charging
ISO 5474-3 2024 Electrically propelled road vehicles - - -
Functional and safety requirements for
power transfer between vehicle and
external electric circuit - Part 3: DC power
transfer
ISO 15118-10 2025 EN ISO 15118-10 2025
ISO 15118-20 2022 Road vehicles - Vehicle to grid EN ISO 15118-20 2022
communication interface - Part 20: 2nd
generation network layer and application
layer requirements
+ A1 2026 + A1 2026
IEEE 802.3-2022 IEEE Standard for Ethernet - -
10BASE-T1S channel and components - -

requirements for link segments - Electrical
requirements and measurements
specification for 10BASE-T1S channels
and components [online], Open Alliance
Inc. Version 1.1, 2025, [viewed 2026-02-
05]. Available at:
https://opensig.org/wpcontent/uploads/202
5/06/10BASE-T1S-Channel-and-
Component-Requirements-for-Link-
Segments.pdf
IEC 61851-23-3 ®
Edition 1.0 2026-08
INTERNATIONAL
STANDARD
Electric vehicle conductive charging system -
Part 23-3: DC electric vehicle supply equipment - Megawatt charging systems
ICS 43.120  ISBN 978-2-8327-1438-6

IEC 61851-23-3:2026-08(en)
IEC 61851-23-3:2026 © IEC 2026
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General requirements. 9
5 Classification . 9
6 Charging modes and functions . 9
7 Communications . 18
8 Protection against electric shock . 19
9 Conductive electrical interface requirements. 23
10 Requirements for adaptors . 24
11 Cable assembly requirements . 24
12 EV supply equipment constructional requirements and tests . 24
13 Overload and short-circuit protection . 25
14 Automatic reclosing of protective devices . 26
15 Emergency switching or disconnect (optional). 26
16 Marking and instructions. 26
101 Specific requirements for EV supply equipment . 27
102 Test methods . 33
Annexes . 37
Annex AA (normative) EV supply equipment of system A . 38
Annex BB (normative) EV supply equipment of system B . 39
Annex CC (normative) EV supply equipment of system C . 40
Annex EE (normative) Test load impedance verification. 135
Annex FF (normative) Multi-side B separated EV supply equipment . 137
Annex GG (informative) Communication and energy transfer process between the EV
supply equipment and the EV . 139
Annex HH (informative) Touch current and touch impulse current . 140
Annex AAA (informative) Auxiliary power supply through the insertion detection circuit . 144
Bibliography . 147

Figure 201 – Typical voltages between side B live parts (DC+/DC−) and protective
conductor under normal operation . 13
Figure 202 – Measurement of the touch leakage current . 15
Figure 203 – Examples of a fault between the secondary circuit and the protective
conductor . 16
Figure 204 – Example of the voltage range for active and passive voltage balancing
with a system Y-capacitance according to Table 203 . 20
Figure 205 – Insulation barriers . 21
Figure 206 – Test arrangement MCS_0. 30
Figure 207 – General test setup for system MCS . 34
Figure 208 – Test load example . 35
IEC 61851-23-3:2026 © IEC 2026
Figure CC.201 – Circuit diagram for an EV supply equipment of configuration HH . 42
Figure CC.202 – Example of a filtering circuit for the charge enable circuit . 47
Figure CC.203 – Example of a filtering circuit for the insertion detection circuit . 47
Figure CC.204 – Equivalent disabled side B of the EV supply equipment . 49
Figure CC.205 – Sequence diagram for normal start up . 53
Figure CC.206 – Sequence diagram for normal shutdown during energy transfer by EV
or EV supply equipment . 58
Figure CC.207 – Sequence diagram for EV supply equipment and EV initiated error
shutdown . 62
Figure CC.208 – Sequence diagram for an emergency shutdown executed by the EV . 66
Figure CC.209 – Sequence diagram for an emergency shutdown executed by the EV
supply equipment . 68
Figure CC.210 – Sequence diagram for pause before cable-check phase by EV supply
equipment using ISO 15118-20:2022 and ISO 15118-20:2022/AMD1:2026 . 71
Figure CC.211 – Sequence diagram for pause after pre-charge phase and before
energy transfer stage by the EV supply equipment using ISO 15118-20:2022 and
ISO 15118-20:2022/AMD1:2026 . 75
Figure CC.212 – Worst case equivalent circuit during pre-charge . 85
Figure CC.213 – Restart methods sequence for the EV supply equipment . 87
Figure CC.214 – Restart verification method on the EV supply equipment . 88
Figure CC.215 – Example of a CE state B0 – B transition . 88
Figure CC.216 – Restart methods sequence for the EV . 89
Figure CC.217 – Example of a B0 – EC – B0 toggle . 90
Figure CC.218 – Approaching a single test point TP in CCM (example 1) . 95
Figure CC.219 – Approaching multiple test points TP CCM (example 2) . 95
n
Figure CC.26 – Voltage at the vehicle connector. 107
Figure CC.220 – Test setup for IMD measurement connections . 131
Figure EE.201 – Magnitude of the impedance of the test load between DC+ and DC−
for system MCS . 135
Figure HH.201 – C limit: Y-capacitance considering a human body resistance
of 575 Ω . 142

Table 201 – Comparison between IEC 61851-23 and IEC 61851-23-3 . 6
Table 202 – Voltage threshold for emergency shutdown reaction . 11
Table 203 – Maximum Y-capacitance of the EV supply equipment at side B . 19
Table 204 – Minimum protective measures . 22
Table 205 – Current ripple limit of the EV supply equipment. 27
Table 206 – Recommended circuit parameters of the test load . 36
Table CC.201 – EV supply equipment component values and tolerances for
configuration HH . 42
Table CC.202 – EV component values and tolerances for configuration HH . 43
Table CC.203 – System states of configuration HH based on the CE voltage . 44
Table CC.204 – Charge enable states and voltage ranges for the EV supply equipment . 44
Table CC.205 – Charge enable states and voltage ranges for the EV. 45
Table CC.206 – Insertion detection states and voltage ranges for the EV supply
equipment . 45
IEC 61851-23-3:2026 © IEC 2026
Table CC.207 – Insertion detection states and voltage ranges for the EV . 46
Table CC.208 – EV supply equipment components for charge enable and insertion
detection filtering . 48
Table CC.209 – EV components for charge enable and insertion detection filtering . 48
Table CC.210 – Component limits for the disabled side B of the EV supply equipment. 50
Table CC.211 – Message code mapping for sequence diagram . 52
Table CC.212 – Sequence description for normal start up . 54
Table CC.213 – Sequence description for normal shutdown during energy transfer by
EV or EV supply equipment . 59
Table CC.214 – Overview of error and emergency shutdown cases . 61
Table CC.215 – Sequence description for EV supply equipment and EV initiated error
shutdown . 63
Table CC.216 – Sequence diagram for an emergency shutdown executed by the EV . 67
Table CC.217 – Sequence diagram an emergency shutdown executed by the EV
supply equipment . 69
Table CC.218 – Sequence description for pause before cable-check phase by EV
supply equipment using ISO 15118-20:2022 and ISO 15118-20:2022/AMD1:2026 . 72
Table CC.219 – Sequence description for pause after pre-charge phase and before
energy transfer stage by the EV supply equipment using ISO 15118-20:2022 and
ISO 15118-20:2022/AMD1:2026 . 76
Table CC.220 – Insulation states and EV supply equipment reaction based on the
insulation resistance . 82
Table CC.221 – Values to design the EV supply equipment during pre-charge based on
Figure CC.212. 85
Table CC.222 – Current ripple limits . 104
Table CC.223 – Component valued for the inrush current limit test . 109
Table CC.224 – Current ripple limits . 111
Table CC.225 – Test setup values to measure side B voltage regulation in CVM during
pre-charge . 112
Table CC.226 – Current ripple limits . 114
Table CC.227 – EV simulator characteristics . 125
Table EE.201 – Test load parameters for system MCS . 135
Table AAA.1 – Auxiliary voltage source of the EV supply equipment X 1 . 144
S
Table AAA.2 – Auxiliary voltage source of the EV X 2 . 146
v
IEC 61851-23-3:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electric vehicle conductive charging system -
Part 23-3: DC electric vehicle supply equipment -
Megawatt charging systems
FOREWORD
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indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61851-23-3 has been prepared by IEC technical committee 69: Electric power/energy
transfer systems for electrically propelled road vehicles and industrial trucks. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
69/1132/FDIS 69/1147/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
IEC 61851-23-3:2026 © IEC 2026
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This document is to be read in conjunction with IEC 61851-1:2017 and IEC 61851-23:2023.
The clauses of particular requirements in this document supplement or modify the
corresponding clauses in IEC 61851-23:2023 and IEC 61851-1:2017. Where the text of
subsequent clauses indicates an "addition", an "amendment" to or a "replacement" of the
relevant requirement, test specification or explanation of IEC 61851-23:2023 or
IEC 61851-1:2017, these changes are made to the relevant text of IEC 61851-23:2023 or
IEC 61851-1:2017, which then becomes part of this document. Where no change is necessary,
the words "IEC 61851-23:2023, [clause], is applicable" are used, where [clause] indicated the
relevant clause. Replaced tables and figures are numbered starting from 201. Any additional
items (clause, subclause, figure, etc.), which are not included in IEC 61851-23:2023, have a
number starting from 201, for example 3.201, 201.1, etc. The new annexes of this document
are numbered using triple-alphabet, for example Annex AAA to avoid confusion with the
annexes of IEC 61851-23:2023.
In this document, the following print types are used:
– test specifications: italic type.
– notes: smaller roman type.
A list of all parts in the IEC 61851 series, published under the general title Electric vehicle
conductive charging system, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 61851-23-3:2026 © IEC 2026
INTRODUCTION
Responding to the global challenges of CO reduction and energy security, the automobile
industry has started the development and commercialization of heavy-duty electric vehicles
(EV). These heavy duty EVs are equipped with significantly larger batteries than passenger
cars or light commercial vehicles. The charging power provided by standards published before
the publication of this document does not allow recharging of these batteries within the time
needed for a commercial application of heavy duty EVs – especially considering long routes
with limited time for intermediate charging. Consequently, this document allows for superior
charging power up to several megawatts and describes the related safety and interoperability
requirements. Table 201 shows the comparison between IEC 61851-23 and this document.
Table 201 – Comparison between IEC 61851-23 and IEC 61851-23-3
Topic IEC 61851-23:2023 IEC 61851-23-3
Rated maximum voltage of the EV 1 000 V 1 250 V
supply equipment at side B (EV
side)
Rated continuous current of the EV Maximum as defined in As defined in IEC TS 63379
supply equipment at side B (EV IEC 62196-3
side)
Basic signalling CP and PP (Annex CC) CE and ID
Digital communication HomePlug GreenPHY Ethernet 10BASE-T1S
(IEC 61851-24) with ISO 15118-2, (ISO 15118-10) with ISO 15118-20
ISO 15118-20 or DIN SPEC 70121 as application layer
as application layer
Although the system described in this document has been developed for heavy duty EVs, its
application is not limited practically to these.

IEC 61851-23-3:2026 © IEC 2026
1 Scope
This part of IEC 61851 applies to the EV supply equipment to provide energy transfer between
the supply network and electric vehicles (EVs), with a rated maximum voltage at side A (supply
network side) up to 1 000 V AC or up to 1 500 V DC and a rated maximum voltage at side B
(EV side) up to 1 250 V DC.
NOTE A rated maximum voltage of the EV supply equipment at side B of up to 1 500 V DC is under consideration.
This document specifies the EV supply equipment of megawatt charging system (MCS)
equipped with a coupler according to IEC TS 63379. Systems different to MCS using a coupler
specified in IEC TS 63379 are under consideration.
The requirements for bidirectional power flow systems are under consideration.
This document does not cover all safety aspects related to maintenance.
This document specifies systems with protective separation between side A and side B.
The requirements for digital communication between the EV supply equipment and the EV for
control of energy transfer are defined in ISO 15118-10 and ISO 15118-20.
EV supply equipment in compliance with this document is not intended to provide energy
transfer to a single EV using
– multiple vehicle connectors of the same EV supply equipment, or
– multiple EV supply equipment.
The requirements for such use cases are not specified in this document but are under
consideration.
The requirements for EVs mated to EV supply equipment according to this document are
specified in ISO 5474-3:2024, Annex B.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60364-4-43:2023, Low-voltage electrical installations - Part 4-43: Protection for safety -
Protection against overcurrent
IEC 60364-5-54:2011, Low-voltage electrical installations - Part 5-54: Selection and erection of
electrical equipment - Earthing arrangements and protective conductors
IEC 61851-23:2023, Electric vehicle conductive charging system - Part 23: DC electric vehicle
supply equipment
IEC TS 63379:2026, Vehicle connector, vehicle inlet and cable assembly for megawatt DC
charging
ISO 5474-3:2024, Electrically propelled road vehicles - Functional and safety requirements for
power transfer between vehicle and external electric circuit - Part 3: DC power transfer
IEC 61851-23-3:2026 © IEC 2026
ISO 15118-10:2025, Road vehicles - Vehicle-to-grid communication interface - Part 10:
Physical layer and data link layer requirements for single-pair Ethernet
nd
ISO 15118-20:2022, Road vehicles - Vehicle-to-grid communication interface - Part 2: 2
generation network layer and application layer requirements
ISO 15118-20:2022/AMD1:2026
IEEE 802.3-2022, IEEE Standard for Ethernet
10BASE-T1S channel and components requirements for link segments - Electrical requirements
and measurements specification for 10BASE-T1S channels and components [online], Open
Alliance Inc. Version 1.1, 2025, [viewed 2026-02-05]. Available at: https://opensig.org/wp-
content/uploads/2025/06/10BASE-T1S-Channel-and-Component-Requirements-for-Link-
Segments.pdf
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61851-23:2023 apply,
except as follows.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Insulation
Addition:
3.2.201
simple separation
separation between electric circuits or between an electric circuit and local earth by means of
basic insulation
[SOURCE: IEC 60050-826:2021, 195-06-30]
3.3 Functions
3.3.1
control pilot conductor
Replacement:
charge enable conductor
CE
conductor incorporated in a cable assembly, which, together with the protective conductor, is
part of the charge enable circuit
3.3.5
proximity function
Replacement:
insertion detection function
ID
electrical means to indicate the insertion state of the vehicle connector in the vehicle inlet of
the EV
IEC 61851-23-3:2026 © IEC 2026
4 General requirements
IEC 61851-23:2023, Clause 4, is applicable, except as follows.
Addition:
System MCS shall have protective separation between side A and side B. See 8.105.1.
The specific requirements for EV supply equipment with multiple side Bs (EV sides) are
provided in Annex FF.
General information on the touch current and touch impulse current is provided in Annex HH,
unless otherwise specified in this document.
The following applies in addition:
– the requirements and tests for system C in IEC 61851-23:2023 apply for system MCS;
– all references in IEC 61851-23:2023 to "Annex CC" are replaced with "Annex CC of this
document".
EV supply equipment with a rated continuous current at side B ≥ 500 A:
– in the voltage range: 500 V DC ≤ voltage at side B ≤ 1 250 V, the EV supply equipment shall
provide the rated continuous current at side B or rated continuous power at side B;
– in the voltage range: 400 V DC ≤ voltage at side B < 500 V DC, the EV supply equipment
shall be capable of continuously providing a current at side B ≥ 500 A.
EV supply equipment with a rated continuous current at side B < 500 A shall provide the rated
continuous current at side B or rated continuous power at side B in the voltage range: 400 V
DC ≤ voltage at side B ≤ 1 250 V.
5 Classification
IEC 61851-23:2023, Clause 5, is applicable, except as follows.
5.101 Characteristics of EV supply equipment
5.101.3 System
Replacement:
The EV supply equipment shall be classified according to the system:
– system MCS (see Annex CC).
6 Charging modes and functions
IEC 61851-23:2023, Clause 6, is applicable, except as follows.
6.3 Functions provided in Mode 4
6.3.1 Mandatory functions in Mode 4
6.3.1.1 General
Replacement, in the penultimate paragraph, of "ISO 17409" with "ISO 5474-3".
IEC 61851-23-3:2026 © IEC 2026
6.3.1.2 Continuous continuity checking of the protective conductor
Replacement, in the second paragraph, of "Compliance for system C is checked by CC.7.5.5":
Compliance for system MCS is checked by CC.7.5.5 of this document.
6.3.1.3 Verification that the EV is properly connected to the EV supply equipment
Replacement of the second paragraph:
Proper connection is assumed when the continuity of the charge enable circuit is detected.
6.3.1.4 Energization of the power supply to the EV
IEC 61851-1:2017, 6.3.1.4, is applicable, except as follows.
Replacement of the first paragraph:
The vehicle connector shall not be energized unless the charge enable function between EV
supply equipment and EV has been established correctly with signal states allowing
energization.
Amendment:
The third paragraph is not applicable.
IEC 61851-23:2023, 6.3.1.4, is applicable, except as follows.
Replacement of "The test setup for system C is shown in Figure 131" with "The test setup for
system MCS is shown in Figure 207".
6.3.1.5 De-energization of the power supply to the EV
Replacement of the first paragraph:
If the insertion detection signal is interrupted, the EV supply equipment shall perform an
emergency shutdown as indicated by system MCS.
6.3.1.101 DC supply for the EV
Replacement, in the first paragraph, of the first sentence:
The EV supply equipment shall provide a DC current and voltage to side B according to an
EVCC request.
Replacement, in the first paragraph, of "101.1.1, 101.1.2, 101.1.3, 101.1.4, 101.1.5, and
101.1.6." with "101.1.1, 101.1.2, 101.1.3, 101.1.4 and 101.1.5 of this document, and 101.1.6 of
IEC 61851-23:2023".
Replacement of the third paragraph:
Compliance is checked by the applicable tests in 101.1.1 through 101.1.5 of this document, and
101.1.6 of IEC 61851-23:2023.
IEC 61851-23-3:2026 © IEC 2026
6.3.1.103 Latching of the vehicle connector
Replacement of the last paragraph:
Vehicle connectors and vehicle inlets shall comply with the requirements of IEC TS 63379. See
also 9.101 of this document.
6.3.1.106 Protection against overvoltage at side B between DC+ and DC–
6.3.1.106.1 General
Replacement of the third paragraph:
According to ISO 5474-1:2024, 6.2.8, when unmated, the EV can have a voltage > 60 V DC
and > 30 V AC between DC+ and PE, and between DC− and PE. It is recommended that the
EV does not have a common mode voltage > 60 V, as unbalanced insulation faults can generate
differential voltages at side B > 60 V. For system MCS, the EV may try to use R 6 and R 7 in
S S
Figure CC.204 of the disabled side B circuit to limit this common mode voltage.
6.3.1.106.2 Protection against overvoltage at side B between DC+ and DC− by
emergency shutdown
Replacement:
The EV supply equipment shall trigger an emergency shutdown in 1 ms or less if, during the
energy transfer stage, the present voltage at side B between DC+ and DC− is more than the
voltage thresholds specified in Table 202 for more than 9 consecutive ms.
Table 202 – Voltage threshold for emergency shutdown reaction
Negotiated maximum voltage at Voltage threshold
side B (U)
V
V
U ≤ 500 550
500 < U ≤ 750 825
750 < U ≤ 850 935
850 < U ≤ 1 000 1 100
1 000 < U ≤ 1250 1 375
Compliance is checked by CC.7.5.7.1.
6.3.1.107 Verification of vehicle connector latching
IEC 61851-23:2023, 6.3.1.107, is not applicable.
6.3.1.112 Voltage limitation between side B live parts (DC+ and DC−) and protective
conductor
6.3.1.112.1 Maximum voltage between side B live parts (DC+ and DC−) and protective
conductor under normal operation
Replacement:
Under normal operation, the EV supply equipment shall limit the present voltage between side
B live parts (DC+/DC−) and the protective conductor to U (see Formula (201)). The voltage
limit U includes the additional voltage from an IMD (see Figure 201).
IEC 61851-23-3:2026 © IEC 2026
U ≤ min(U ;max (614;0,5 × U + 75))
(201)
2 1 1
where
U is the present voltage at side B between DC+ and DC−, expressed in volts;
U is the present voltage between side B live parts (DC+/DC−) and the protective conductor,
expressed in volts.
NOTE 1 Transient overvoltages are not limited by voltage balancing.
NOTE 2 According to ISO 5474-3:2024, Annex B, the vehicle deactivates any means that actively impact the
balance between DC+ and the protective conductor and between DC− and the protective conductor before closing
its disconnection device.
NOTE 3 A balanced voltage between side B live parts (DC+/DC−) and the protective conductor minimizes the touch
impulse current.
Infrequent short-term (< 10 s) voltages above the limit U due to disturbances are permitted,
for example at startup or due to load/source switching.
When the absolute value of the present voltage between side B live parts (DC+/DC–) and the
protective conductor exceeds the limit U Formula (201), the EV supply equipment shall reduce
within 10 s, and energy transfer
the absolute value of the present voltage below the limit U
shall not stop.
The EV supply equipment may employ passive or active techniques to minimize the touch
impulse current, possibly in coordination with the IMD or earth fault monitor of the EV supply
equipment.
The steady-state touch current limits of 8.101.4 apply also under single fault conditions in the
circuit that facilitates the voltage balancing.
Compliance is checked with design review.
Figure 201 a) and b) show an example of a correct implementation.
IEC 61851-23-3:2026 © IEC 2026

a) Typical IMD implementation
b) Waveform of an IMD implementation with a pulsed signal
Key
V V
voltage at side B between DC+ and DC− upper voltage limit for DC+ and DC−
1 max
maximum common mode voltage including
V V
lower voltage limit for DC+ and DC−
2 min
IMD
, the touch current limitation to the c1
NOTE If the voltage between DC+/DC− and protective conductor exceeds U
curve specified as special protection in 8.105.1 cannot be met.
Figure 201 – Typical voltages between side B live parts (DC+/DC−)
and protective conductor under normal operation
IEC 61851-23-3:2026 © IEC 2026
Compliance is checked by the following tests.
Test 1:
The test setup for system MCS is shown in Figure 207.
1) Preconditions for the test
i) The EV simulator shall use the following limits: V = V
EV_rated_max EVSE_rated_max_sideB
and I = I during the compatibility check (see
EV_rated_max EVSE_rated_boost_sideB
6.3.1.104) in order to not limit the operating range.
ii) The EV simulator shall draw current during this test, in order to reach and maintain
power transfer.
2) The following voltage and current values shall be applied:
i) V = 0,8 × V ;
EV_simulator EVSE_rated_max_sideB
ii) I = I = I / 2.
EVSE_intended EV_trg EVSE_rated_boost_sideB
3) Perform the following actions.
i) The FPT sequence is to be successfully done until t = t according to Figure CC.205,
including the message "PowerDeliveryReq".
ii) Wait until A 1 ≥ 80 % of I for 5 s.
T EV_trg
iii) Measure V 3, V 4 and V 5 continuously for 100 s.
T T T
Low pass filter should be applied, in order to filter out transients. Recommended cut-off
frequency: 10 Hz to 200 Hz.
4) Check the expected results.
V 3 and V 4 shall be less than or equal to the following limit: |V 3| ≤ V 5 + 50 V DC and
T T T T
|V 4| ≤ V 5 + 50 V DC.
T T
Test 2:
The test setup for system MCS is shown in Figure 207.
Pre-conditions for the test:
a) The EV supply equipment manufacturer shall specify the operating point at which the EV
supply equipment has the maximum energy stored in the Y-capacitance between DC+/DC–
and the protective conductor.
b) The test setup shall have the maximum EV Y-capacitance (C 7/ C 8) for the operating point
T T
specified in step a), as specified in ISO 5474-3:2023, Annex B.
NOTE 4 The EV supply equipment can switch in more PECs depending on the current demand, as well as put
modules in series or parallel due to the voltage demand. This can influence the total Y-capacitance and leakage
current.
c) Approach the test point as specified in step a) according to CC.7.4.
d) Adjust the measu
...