prEN 50121-3-2:2025
(Main)Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock - Apparatus
Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock - Apparatus
This European Standard applies to emission and immunity aspects of EMC for electrical and electronic apparatus intended for use on railway rolling stock. EN 50121-3-2 applies for the integration of apparatus on rolling stock. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. This standard takes into account the internal environment of the railway rolling stock and the external environment of the railway, and interference to the apparatus from equipment such as hand-held radiotransmitters. The objective of this standard is to define limits and test methods for electromagnetic emissions and immunity test requirements in relation to conducted and radiated disturbances. These limits and tests represent essential electromagnetic compatibility requirements. Emission requirements have been selected so as to ensure that disturbances generated by the apparatus operated normally on railway rolling stock do not exceed a level which could prevent other apparatus from operating as intended. The emission limits given in this document take precedence over emission requirements for individual apparatus on board the rolling stock given in other documents. Test requirements are specified for each port considered. The specific provisions in this document are complementary to the general provisions in EN 50121-1:2017
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 3-2: Bahnfahrzeuge - Geräte
Applications ferroviaires - Compatibilité électromagnétique - Partie 3-2: Matériel roulant - Appareils
Železniške naprave - Elektromagnetna združljivost - 3-2. del: Vozna sredstva - Naprave
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Železniške naprave - Elektromagnetna združljivost - 3-2. del: Vozna sredstva -
Naprave
Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock - Apparatus
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 3-2: Bahnfahrzeuge -
Geräte
Applications ferroviaires - Compatibilité électromagnétique - Partie 3-2: Matériel roulant -
Appareils
Ta slovenski standard je istoveten z: prEN 50121-3-2:2025
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD DRAFT
prEN 50121-3-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 29.280; 33.100.01; 45.020 Will supersede EN 50121-3-2:2016; EN 50121-3-
2:2016/A1:2019
English Version
Railway applications - Electromagnetic compatibility - Part 3-2:
Rolling stock - Apparatus
Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -
Partie 3-2: Matériel roulant - Appareils Teil 3-2: Bahnfahrzeuge - Geräte
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2025-10-24.
It has been drawn up by CLC/TC 9X.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79752 Ref. No. prEN 50121-3-2:2025 E
1 Contents Page
2 European foreword . 3
3 1 Scope . 5
4 2 Normative references . 5
5 3 Terms definitions and abbreviations . 6
6 3.1 Terms and definitions . 6
7 3.2 Abbreviations . 8
8 4 Overall aspects . 8
9 4.1 Conditions during testing . 8
10 4.2 Applicability . 9
11 5 Emission . 9
12 6 Immunity .15
13 6.1 Performance Criteria .15
14 6.2 Immunity requirements .15
15 Annex A (informative) Examples of apparatus and ports .20
16 Annex B (informative) Disturbances generated by power converters .29
17 Annex C (informative) Reasons for changes in immunity requirements and additional
18 information about railway specific influences .30
19 C.1 Justification for changed surge requirements for battery supply input referenced ports
20 and auxiliary AC / DC supply input ports.30
21 C.2 Justification for changed fast transients requirements .30
22 C.3 Justification for added surge requirements for DC or AC input ports and DC or AC output
23 ports of specific supply systems .30
24 C.4 Justification for changed radio-frequency electromagnetic field tests .31
25 C.5 Justification for added Power frequency magnetic field test .31
26 Bibliography .33
28 European foreword
29 This document (prEN 50121-3-2:2025) has been prepared by CLC/TC 9X “Electrical and electronic
30 applications for railways”.
31 This document is currently submitted to the Enquiry.
32 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
33 This document has been prepared according to Decision 69/09 taken during the TC 9X meeting.
34 This document will supersede EN 50121-3-2:2016.
35 prEN 50121-3-2:2025 includes the following significant technical changes with respect to
36 EN 50121-3-2:2016:
37 — clarification added in scope, last paragraph;
38 — update of normative references;
39 — update of terms and definitions and abbreviations;
40 — new structure with Clause 4: Overall aspects, Clause 5: Emission and Clause 6: Immunity;
41 — conditions during testing summarized in new Clause 4.1;
42 — applicability summarized in new Clause 4.2;
43 — clarification of Clause 5, Emission;
44 — update of Tables 1 and 2, introduction of new Table 3 in Clause 5, Emission;
45 — update of Tables 4 to 6 in Clause 6, Immunity;
46 — update of informative Annex A, clarification in last sentence of first paragraph, new Figures A.6 and
47 A.7 included, new ports 23 and 24 added in Table A.2 and following figures;
48 — new informative Annex C with reasons for new immunity requirements and additional information
49 about railway specific influences included;
50 — deletion of Annex ZZ.
51 This European Standard is read in conjunction with prEN 50121-1:2025.
52 This standard forms Part 3-2 of the European Standard series EN 50121, published under the general
53 title “Railway applications - Electromagnetic compatibility”. The series consists of:
54 — Part 1: General;
55 — Part 2: Emission of the whole railway system to the outside world;
56 — Part 3-1: Rolling stock - Train and complete vehicle;
57 — Part 3-2: Rolling stock – Apparatus;
58 — Part 4: Emission and immunity of the signalling and telecommunications apparatus;
59 — Part 5: Emission and immunity of fixed power supply installations and apparatus.
60 1 Scope
61 This document applies to emission and immunity aspects of EMC for electrical and electronic apparatus
62 intended for use on railway rolling stock. prEN 50121-3-2:2025 applies for the integration of apparatus
63 on rolling stock.
64 The test frequency range defined in this document is considered to ensure the electromagnetic
65 compatibility of the apparatus in the whole frequency range from 0 Hz (DC) to 400 GHz.
66 The application of tests depends on the particular apparatus, its configuration, its ports, its technology
67 and its operating conditions.
68 This document takes into account the internal environment of the railway rolling stock and the external
69 environment of the railway, and interference to the apparatus from equipment such as hand-held radio-
70 transmitters.
71 This document does not apply to transient emissions when starting or stopping the apparatus.
72 The objective of this document is to define limits and test methods for electromagnetic emissions and
73 immunity test requirements in relation to conducted and radiated disturbances.
74 These limits and tests represent essential electromagnetic compatibility requirements.
75 Emission requirements have been selected so as to ensure that disturbances generated by the
76 apparatus operated normally on railway rolling stock do not exceed a level which could prevent other
77 apparatus from operating as intended.
78 Likewise, the immunity requirements have been selected so as to ensure an adequate level of immunity
79 for rolling stock apparatus.
80 Test requirements are specified for each port considered.
81 AC and DC traction power ports (see Table A.2) are not covered in this document.
82 2 Normative references
83 The following documents are referred to in the text in such a way that some or all of their content
84 constitutes requirements of this document. For dated references, only the edition cited applies. For
85 undated references, the latest edition of the referenced document (including any amendments) applies.
86 prEN 50121-1:2025, Railway applications - Electromagnetic compatibility - Part 1: General
87 EN 50155:2021, Railway applications - Rolling stock - Electronic equipment
88 EN 55016-1-1:2019, Specification for radio disturbance and immunity measuring apparatus and
89 methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus
90 (CISPR 16-1-1:2019)
91 EN 55016-1-2:2014, Specification for radio disturbance and immunity measuring apparatus and
92 methods - Part 1-2: Radio disturbance and immunity measuring apparatus - Coupling devices for
93 conducted disturbance measurements
94 EN 55016-1-4:2019, Specification for radio disturbance and immunity measuring apparatus and
95 methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for
96 radiated disturbance measurements (CISPR 16-1-4:2019)
97 EN 55016-1-6:2015 , Specification for radio disturbance and immunity measuring apparatus and
98 methods - Part 1-6: Radio disturbance and immunity measuring apparatus - EMC antenna calibration
99 (CISPR 16-1-6:2014)
As impacted by EN 55016-1-2:2014/A1:2018.
As impacted by EN 55016-1-6:2015/A1:2017 and EN 55016-1-6:2015/A2:2022.
100 EN 55016-2-1:2014, Specification for radio disturbance and immunity measuring apparatus and
101 methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance
102 measurements (CISPR 16-2-1:2014)
103 EN 55016-2-3:2017, Specification for radio disturbance and immunity measuring apparatus and
104 methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance
105 measurements (CISPR 16-2-3:2016)
106 EN 61000-4-2:2009, Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement
107 techniques - Electrostatic discharge immunity test (IEC 61000-4-2:2008)
108 EN IEC 61000-4-3:2020, Electromagnetic compatibility (EMC) - Part 4-3 : Testing and measurement
109 techniques - Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2020)
110 EN 61000-4-4:2012, Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement
111 techniques - Electrical fast transient/burst immunity test (IEC 61000-4-4:2012)
112 EN 61000-4-5:2014, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement
113 techniques - Surge immunity test (IEC 61000-4-5:2014)
114 EN IEC 61000-4-6:2023, Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement
115 techniques - Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-
116 6:2023)
117 EN 61000-4-8:2010, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement
118 techniques - Power frequency magnetic field immunity test (IEC 61000-4-8:2009)
119 EN IEC 61000-4-20:2022, Electromagnetic compatibility (EMC) - Part 4-20: Testing and measurement
120 techniques - Emission and immunity testing in transverse electromagnetic (TEM) waveguides (IEC
121 61000-4-20:2022)
122 EN 61000-4-30:2015, Electromagnetic compatibility (EMC) - Part 4-30: Testing and me
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