EN IEC 63341-3:2026

SLOVENSKI STANDARD
01-marec-2026
Železniške naprave - Sistemi gorivnih celic za vozna sredstva - 3. del: Metode za
preskušanje zmogljivosti elektroenergetskih napajalnih sistemov z gorivnimi
celicami
Railway applications - Fuel cell systems for rolling stock - Part 3: Performance test
methods for fuel cell power systems
Bahnanwendungen - Wasserstoff- und Brennstoffzellen-Energiesysteme für
Bahnfahrzeuge - Teil 3: Leistungsprüfverfahren für Brennstoffzellen-Energiesysteme
Systèmes à pile à combustible pour matériel roulant - Partie 3: Méthodes d’essai des
performances pour système à pile à combustible
Ta slovenski standard je istoveten z: EN IEC 63341-3:2026
ICS:
27.070 Gorilne celice Fuel cells
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 EN IEC 63341-3

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2026
ICS 27.070; 03.220.30
English Version
Railway applications - Hydrogen and fuel cell systems for rolling
stock - Part 3: Performance test methods for fuel cell power
system
(IEC 63341-3:2025)
Applications ferroviaires - Systèmes à hydrogène et à pile à Bahnanwendungen - Wasserstoff- und Brennstoffzellen-
combustible pour matériel roulant - Partie 3 : Méthodes Energiesysteme für Bahnfahrzeuge - Teil 3:
d'essai des performances pour système à pile à Leistungsprüfverfahren für Brennstoffzellen-
combustible Energiesysteme
(IEC 63341-3:2025) (IEC 63341-3:2025)
This European Standard was approved by CENELEC on 2025-12-26. 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 63341-3:2026 E

European foreword
The text of document 105/1113/FDIS, future edition 1 of IEC 63341-3, prepared by TC 105 "Fuel cell
technologies" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-01-31
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.
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 63341-3:2025 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 60349 (series) NOTE Approved as EN 60349 (series)
IEC 61133 NOTE Approved as EN IEC 61133
IEC 61377 NOTE Approved as EN 61377
IEC 61881-3 NOTE Approved as EN 61881-3
IEC 62864-1 NOTE Approved as EN 62864-1
IEC 62928:2017 NOTE Approved as EN IEC 62928:2018 (not modified)
Approved as prEN IEC 62973-1:2025 (not modified) to be
IEC 62973-1:2018 NOTE
published
IEC 63341-1:2025 NOTE Approved as EN IEC 63341-1:2025 (not modified)
IEC 63341-2 NOTE Approved as FprEN IEC 63341-2 to be published
IEC 62282-3-200:2015 NOTE Approved as EN 62282-3-200:2016 (not modified)
ISO 5815 (series) NOTE Approved as EN ISO 5815 (series)
ISO 10523 NOTE Approved as EN ISO 10523
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 60571 - Railway applications - Electronic equipment - -
used on rolling stock
IEC 61287-1 - Railway applications - Power converters EN 61287-1 -
installed on board rolling stock - Part 1:
Characteristics and test methods
IEC 62236-3-1 - Railway applications - Electromagnetic - -
compatibility - Part 3-1: Rolling stock - Train
and complete vehicle
IEC 62236-3-2 - Railway applications - Electromagnetic - -
compatibility - Part 3-2: Rolling stock -
Apparatus
IEC 62498-1 - Railway applications - Environmental - -
conditions for equipment - Part 1: Equipment
on board rolling stock
ISO 3744 - Acoustics - Determination of sound power EN ISO 3744 -
levels and sound energy levels of noise
sources using sound pressure - Engineering
methods for an essentially free field over a
reflecting plane
ISO 3746 - Acoustics - Determination of sound power EN ISO 3746 -
levels and sound energy levels of noise
sources using sound pressure - Survey
method using an enveloping measurement
surface over a reflecting plane
ISO 9614-1 - Acoustics - Determination of sound power EN ISO 9614-1 -
levels of noise sources using sound intensity
- Part 1: Measurement at discrete points
ISO 9614-2 - Acoustics - Determination of sound power EN ISO 9614-2 -
levels of noise sources using sound intensity
- Part 2: Measurement by scanning
ISO 14687 2019 Hydrogen fuel quality - Product specification - -

IEC 63341-3 ®
Edition 1.0 2025-11
INTERNATIONAL
STANDARD
Railway applications - Hydrogen and fuel cell systems for rolling stock -
Part 3: Performance test methods for fuel cell power system
ICS 27.070; 03.220.30 ISBN 978-2-8327-0817-0

IEC 63341-3:2025-11(en)
IEC 63341-3:2025 © IEC 2025
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated term . 9
3.1 Terms and definition . 9
3.2 Abbreviated terms. 15
4 Configuration of the fuel cell power system . 15
4.1 FCPS power distribution . 15
4.2 Typical state of a fuel cell power system . 15
5 Symbols . 16
6 Test preparation . 19
6.1 General . 19
6.2 Test station setup . 19
6.3 Instruments and measurement methods . 20
6.3.1 General. 20
6.3.2 Measurement instruments . 21
6.3.3 Measurement points . 21
6.3.4 Minimum required measurement systematic uncertainty . 22
6.4 Test conditions . 22
6.4.1 Laboratory conditions . 22
6.4.2 Installation and operating conditions of the system . 23
6.4.3 Quality of hydrogen . 23
6.4.4 Quality of power input. 23
7 Test method . 23
7.1 General . 23
7.2 Operating tests for stabilized operation . 23
7.2.1 General. 23
7.2.2 Test method . 24
7.2.3 Processing of results . 25
7.3 Operating test for dynamic operation . 28
7.3.1 Start-up and go operational test . 28
7.3.2 Power ramp up test . 32
7.3.3 Power ramp down, go standby and shutdown test . 34
7.4 Polarization curve test . 38
7.4.1 General. 38
7.4.2 Test method . 38
7.4.3 Processing of results . 39
7.5 Load profile test . 39
7.5.1 General. 39
7.5.2 Test method . 40
7.6 Environmental tests . 40
7.6.1 General. 40
7.6.2 Altitude test . 40
7.6.3 Power generation test at low and high temperatures . 41
7.6.4 Power generation test under low and high humidity conditions . 43
IEC 63341-3:2025 © IEC 2025
7.7 Acoustic noise emissions . 44
7.8 EMC . 44
8 Test reports . 44
8.1 General . 44
8.2 Title page . 44
8.3 Table of contents . 45
8.4 Summary report . 45
Annex A (normative) Net power correction methods . 46
A.1 General . 46
A.2 FCPS without power converter . 46
A.2.1 Electrical system configuration 1 . 46
A.2.2 Electrical system configuration 2 . 47
A.2.3 Electrical system configuration 3 . 47
A.2.4 Electrical system configuration 4 . 48
A.3 FCPS with power converter . 49
A.3.1 Electrical system configuration 1 . 49
A.3.2 Electrical system configuration 2 . 49
Annex B (informative) The enthalpy drop converting electrical power . 51
B.1 General . 51
B.2 Converting way. 51
Annex C (normative) Specific load profiles verification. 52
C.1 General . 52
C.2 General methodology . 52
C.3 FCPS sizing documentation . 53
C.4 Operational verification . 53
C.5 Test report . 53
Annex D (normative) Standard load profiles verification . 54
D.1 General . 54
D.2 General methodology . 54
D.3 Test method . 57
D.4 Test report . 57
Annex E (informative) Guidelines for the contents of detailed and full reports . 58
E.1 General . 58
E.2 Detailed report . 58
E.3 Full report . 58
Bibliography . 59

Figure 1 – Hierarchy of standards related to IEC 63341 . 6
Figure 2 – FCPS power distribution . 15
Figure 3 – Typical state diagram for the FCPS . 16
Figure 4 – Example of a test station setup for FCPS . 20
Figure 5 – Examples of a start-up and go operational test. 30
Figure 6 – Examples of a power ramp up test . 33
Figure 7 – Examples of a power ramp down, go standby and shutdown test . 35
Figure 8 – Example of a load profile cycle . 40
Figure A.1 – Electrical system configuration 1 of FCPS without power converter . 46
Figure A.2 – Electrical system configuration 2 of FCPS without power converter . 47
IEC 63341-3:2025 © IEC 2025
Figure A.3 – Electrical system configuration 3 of FCPS without power converter . 48
Figure A.4 – Electrical system configuration 4 of FCPS without power converter . 49
Figure A.5 – Electrical system configuration 1 of FCPS with power converter . 49
Figure A.6 – Electrical system configuration 2 of FCPS with power converter . 50
Figure D.1 – High dynamic standard load profile . 56
Figure D.2 – Low dynamic standard load profile . 57

Table 1 – Symbols and definitions . 16
Table 2 – Subsystem parameters of the FCPS for recording . 24
Table 3 – Polarization curve test points . 38
Table 4 – Example of a load profile cycle . 39
Table D.1 – High dynamic standard load profile . 54
Table D.2 – Low dynamic standard load profile . 56

IEC 63341-3:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Railway applications -
Hydrogen and fuel cell systems for rolling stock -
Part 3: Performance test methods for fuel cell power system

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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 63341-3 has been prepared by IEC Technical Committee 105: Fuel cell technologies. It is
an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
105/1113/FDIS 105/1145/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 63341-3:2025 © IEC 2025
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.
A list of all parts in the IEC 63341 series, published under the general title Railway applications
– Fuel cell systems for rolling stock, 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 63341-3:2025 © IEC 2025
INTRODUCTION
The scope of the IEC 63341 series encompasses categories such as fuel cell power systems,
hydrogen fuel systems, and performance test methods for fuel cell power systems.
This part of IEC 63341 establishes uniform and replicable testing methodologies for the
electrical and environmental performance of fuel cell power systems employed in rolling stock.
It is important to note that this document does not specify or categorise the tests in any
particular way, nor does it establish performance targets.
Fuel cells utilised in rolling stock, including light rail vehicles, trams, streetcars, metros,
commuter trains, regional trains, high-speed trains, and locomotives, are classified as hybrid
systems, thereby operating in multiple modes. A similar observation can be made about rolling
stock, which also operates in different modes. The purpose of this document is to evaluate the
fuel cell system in the different combinations of fuel cell modes and rolling stock operating
modes.
It is anticipated that this document will be utilised by manufacturers of fuel cell power systems
employed in rolling stock, as well as those engaged in the evaluation of the performance of
their systems.
Users of this document are at liberty to select test items from those described herein that are
appropriate for their purposes. It is important to note that the present document does not seek
to exclude the utilisation of alternative methods.
The hierarchical structure of standards is illustrated in Figure 1. It should be noted that the
standards enumerated in Figure 1 are not exhaustive.

Figure 1 – Hierarchy of standards related to IEC 63341
IEC 63341-3:2025 © IEC 2025
The decision was taken by TC 105 to initiate a project on generic fuel cell technologies, with a
view to covering different industrial sectors:
• IEC 62282 (all parts): Fuel cell technologies:
– IEC 62282-2-100: Fuel cell modules
– IEC 62282-3-100: Stationary fuel cell power systems – Safety
– IEC 62282-4-101: Fuel cell power systems for electrically powered industrial trucks –
Safety
It is evident that these standards are frequently generic in nature and therefore not specific to
the requirements of railway applications.
The IEC 63341 series Railway applications – Fuel cell systems for rolling stock is divided into
several parts as outlined below:
• IEC 63341-1: Fuel cell power system
• IEC 63341-2: Hydrogen fuel system
• IEC 63341-3: Performance tests methods for fuel cell power system

IEC 63341-3:2025 © IEC 2025
1 Scope
This part of IEC 63341 specifies the performance evaluation methodologies for fuel cell power
systems that are designed for utilisation in electrically propelled rolling stock.
The scope of this document concerns itself exclusively with electrically powered rolling stock.
Internal combustion engines utilising hydrogen are not encompassed within the scope of this
document.
This document is applicable to hydrogen fuel cell power systems for electrically propelled rolling
stock.
This document does not apply to reformer-equipped fuel cell power systems.
This document does not cover the hydrogen fuel systems that are permanently or separately
attached to either the rolling stock or the fuel cell power system. These systems are addressed
in IEC 63341-2.
The fundamental system overview, incorporating the interrelationships between the primary
functions and the connections to the external system, is delineated in IEC 63341-1:2025,
Figure 4.
The relevant standards are comprehensively delineated in IEC 63341-1. The performance
targets for fuel cell power systems are agreed upon between the user and the manufacturer.
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 60571, Railway applications - Electronic equipment used on rolling stock
IEC 61287-1, Railway applications - Power converters installed on board rolling stock - Part 1:
Characteristics and test methods
IEC 62236-3-1, Railway applications - Electromagnetic compatibility - Part 3-1: Rolling stock -
Train and complete vehicle
IEC 62236-3-2, Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock -
Apparatus
IEC 62498-1, Railway applications - Environmental conditions for equipment - Part 1:
Equipment on board rolling stock
ISO 3744, Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Engineering methods for an essentially free field over a
reflecting plane
ISO 3746, Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Survey method using an enveloping measurement surface over
a reflecting plane
ISO 9614-1, Acoustics - Determination of sound power levels of noise sources using sound
intensity - Part 1: Measurement at discrete points
IEC 63341-3:2025 © IEC 2025
ISO 9614-2, Acoustics - Determination of sound power levels of noise sources using sound
intensity - part 2: Measurement by scanning
ISO 14687:2019, Hydrogen fuel quality - Product specification
3 Terms, definitions and abbreviated term
3.1 Terms and definition
For the purpose of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
3.1.1
fuel cell power system
FCPS
generator system that uses one or more fuel cell power modules to generate electric power and
heat
Note 1 to entry: This system typically includes the following subsystems: fuel cell power module, oxidant
management system, fuel management system, thermal management system, exhaust management system,
electrical and power management system, and their monitoring and control system.
[SOURCE: IEC 60050-485:2020, 485-09-01, modified – "fuel cell modules" has been replaced
with "fuel cell power modules"; Note 1 to entry has been added.]
3.1.2
fuel cell stack
FCS
equipment assembly of two or more cells, separators, cooling plates, manifolds and a support
structure that electrochemically converts, typically, hydrogen rich gas and air reactants to
electric power, heat and other reactant bi-products
[SOURCE: IEC 60050-485:2020 485-06-01, modified – "equipment", "two or more", and "bi-"
have been added; "supporting" has been replaced with "support"; "hydrogen-rich" has been
replaced with "hydrogen rich"; "DC" has been replaced with "electric" and "reaction" has been
replaced with "reactant".]
3.1.3
fuel cell power module
fuel cell module
FCPM
assembly incorporating one or more fuel cell stacks and other main and, if applicable, additional
components, which is intended to be integrated into a power system
Note 1 to entry: A fuel cell module can contain the following equipment: its control system and, optionally, the cell
voltage monitoring device, the fuel recirculation device, the humidification device for reactants, sensors, valves and
actuators. This subsystem is a part of the fuel cell power system.
[SOURCE: IEC 60050-485:2020, 485-09-03, modified – "fuel cell power module" has been
added as the first preferred term. In the definition, "other main and" has been added, "that" has
been replaced with "which", and "or a vehicle" has been deleted. Note 1 to entry has been
modified.]
IEC 63341-3:2025 © IEC 2025
3.1.4
oxidant management system
OMS
system including filtering and pressuring equipment (and optionally humidifying equipment),
sensors and valves, able to manage the incoming oxidant to supply the FCPM (or fuel cell stack)
Note 1 to entry: This subsystem is a part of the fuel cell power system.
Note 2 to entry: Air from the environment is one example as incoming oxidant.
3.1.5
thermal management system
TMS
thermal loop including pump, heat exchanger, fan, heater, sensors and valves (and optionally
ion removal device), able to manage the temperature of the fuel cell power system and coolant
for cooling purpose and heating purpose
Note 1 to entry: This subsystem is a part of the fuel cell power system.
3.1.6
exhaust management system
ExMS
fluidic circuit able to manage the gas exhaust from the fuel cell power system to the environment
Note 1 to entry: This subsystem is a part of the fuel cell power system.
3.1.7
electronic power converter
power converter
operative unit for electronic power conversion, comprising one or more electronic valve devices,
transformers and filters if necessary and auxiliaries if any
Note 1 to entry: A power converter can be a DC/DC converter (insulated type) or chopper (non-insulated type).
[SOURCE: IEC 60050-551:1998, 551-12-01, modified – The note has been replaced with a new
note to entry and the figure has been deleted.]
3.1.8
gross power
DC outlet power of operational fuel cell stack(s)
Note 1 to entry: The gross power is expressed in watts (W).
Note 2 to entry: See Figure 2.
[SOURCE: IEC 60050-485:2020, 485-14-01, modified – "of a fuel cell stack" has been replaced
with "of operational fuel cell stack(s)".]
3.1.9
output power
power generated by the fuel cell power system and available for external use
Note 1 to entry: Output power is equal to gross power minus internal consumed power.
Note 2 to entry: See Figure 3.
IEC 63341-3:2025 © IEC 2025
3.1.10
input power
power from outside needed for the operation of the fuel cell power system, consumed by the
auxiliaries which are not internally supplied at fuel cell power system level
Note 1 to entry: The consumption of the auxiliaries is partially or entirely provided by the input power.
Note 2 to entry: See Figure 3.
3.1.11
net electric power
net power
remaining power generated by the fuel cell power system usable in totality for external use
Note 1 to entry: Net power is equal to output power minus input power.
[SOURCE: IEC 60050-485:2020, 485-14-03, modified – "remaining" has been added; "and
available" has been replaced with "usable in totality"; Note 1 to entry has been been deleted
and Note 2 to entry has been modified.]
3.1.12
auxiliary consumption
power consumed by all the fuel cell power system auxiliaries necessary for the fuel cell power
system operation, which is the sum of the input power and the internally consumed power
Note 1 to entry: Auxiliary consumption is equal to gross power minus output power plus input power.
Note 2 to entry: See Figure 3.
3.1.13
internally consumed power
power consumed internally by the fuel cell power system auxiliaries
Note 1 to entry: Internally consumed power could be 0.
Note 2 to entry: See Figure 3.
3.1.14
minimum power
minimum output power at which the fuel cell power system can operate
3.1.15
idle power
minimum output power at which the fuel cell power system can operate continuously in a stable
manner
Note 1 to entry: Idle power can be identical or higher than minimum power.
3.1.16
rated power
maximum continuous output power that the fuel cell power system is designed to generate,
established for a specific set of operating conditions specified by the manufacturer
[SOURCE: IEC 60050-485:2020, 485-14-04, modified – "electric power output" has been
replaced with "output power"; "achieve under normal" has been replaced with "generate,
established for a specific set of". The note to entry has been deleted.]
IEC 63341-3:2025 © IEC 2025
3.1.17
maximum power
maximum output power at which the fuel cell power system can operate
Note 1 to entry: Maximum power can be higher than rated power.
3.1.18
maximum system efficiency power
output power level at which the fuel cell power system is most efficient and which is specified by
the manufacturer
3.1.19
off state
state of a fuel cell power system with no power input or output
Note 1 to entry: See Figure 3.
3.1.20
cold state
state of a fuel cell power system at ambient temperature with no power input or output
Note 1 to entry: Cold state is a sub-state of the off state
Note 2 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-21-01, modified – The notes to entry have been added.]
3.1.21
hot state
state of the fuel cell power system at normal operating temperature range with no power input
or output
Note 1 to entry: Hot state is a sub-state of the off state.
Note 2 to entry: See Figure 3.
3.1.22
cold start
start-up when the fuel cell power system is below the operating temperature range from cold
state to standby state
Note 1 to entry: The fuel cell power system can be pre-heated during this phase.
Note 2 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-18-02, modified – "at ambient temperature" has been
replaced with "below the operating temperature range from cold state to standby state"; the
notes to entry" have been added.]
3.1.23
hot start
start-up when the fuel cell power system is within its operating temperature range from hot state
to standby state
Note 1 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-18-03 – modified – "normal operating temperature range"
has been replaced with "operating temperature range from hot state to standby state". Note 1
to entry has been added.]
IEC 63341-3:2025 © IEC 2025
3.1.24
standby state
pre-generation state
state of a fuel cell power system at a sufficient operating temperature and in such an operational
mode, with zero electric power output, that the fuel cell power system is capable of being
promptly switched to an operational state with a substantial electric power output
Note 1 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-21-04, modified – "standby state" has been added as the
first preferred term and the term "pre-generation operation" has been deleted. Note 1 to entry
has been added.]
3.1.25
operational state
state of a fuel cell power system with a substantial electric active power output available
Note 1 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-21-02, modified – Note 1 to entry has been added.]
3.1.26
steady state
state of a physical system in which the relevant characteristics remain constant
with time
Note 1 to entry: Steady state is the state of the fuel cell power system with constant output power from idle power
to rated power.
Note 2 to entry: See Figure 3.
[SOURCE: IEC 60050-485:2020, 485-21-05, modified – The note to entry have been added.]
3.1.27
power ramp up
transient phase in operational state to go from idle power to rated power
Note 1 to entry: See Figure 3.
3.1.28
power ramp down
transient phase in operational state to go from rated power to idle power
Note 1 to entry: See Figure 3.
3.1.29
shutdown
sequence of operations that occurs to transition a fuel cell power system from the standby state
to the off state(see Figure 3)
[SOURCE IEC 60050-485:2020, 485-19-01, modified – "from the operational state to the
passive state, the pre-generation state, or the cold state" has been replaced with "from the
standby state to the off state"; Note 1 to entry has been omitted.]
3.1.30
go operational
transient phase from standby state to operational state
Note 1 to entry: See Figure 3.
IEC 63341-3:2025 © IEC 2025
3.1.31
go standby
transient phase from operational state to standby state
Note 1 to entry: See Figure 3.
3.1.32
electric efficiency
ratio of the net electric power produced by a fuel cell power system to the total enthalpy flow
supplied to the fuel cell power system
Note 1 to entry: The lower heating value (LHV) is assumed unless otherwise stated.
Note 2 to entry: The total enthalpy flow is equal to the lower heating value (LHV) multiplied by the hydrogen
consumption.
[SOURCE: IEC 60050-485:2020, 485-10-02, modified – Note 2 to entry has been added.]
3.1.33
conditioning
preliminary step that is required to properly operate a fuel cell to achieve a desired performance
following a protocol specified by the manufacturer
Note 1 to entry: The conditioning can include reversible processes, or irreversible processes, or both depending on
the cell technology.
[SOURCE: IEC 60050-485:2020, 485-11-08]
3.1.34
waste water
excess water that is removed from the fuel cell power system and that does not constitute part
of the thermal recovery system
[SOURCE: IEC 60050-485:2020, 485-09-13]
3.1.35
polarization curve
plot of the output voltage as a function of output current at defined operating condition for fuel
cell stack, fuel cell module or fuel cell power system
Note 1 to entry: The polarization curve is expressed in volts (V) versus amperes (A).
[SOURCE: IEC 60050-485:2020, 485-15-06, modified – “of a fuel cell” has been removed,
"current density" has been replaced with "output current"; "reaction" has been replaced with
"operating"; the end of the definition starting with “for fuel cell stack” has been added; "Note 1
to entry" has been modified.]
3.1.36
efficiency curve
plot of the system efficiency of the fuel cell power system as a function of net power at defined
operating condition
Note 1 to entry: The efficiency curve is plotted in % versus kW.
3.1.37
load profile
electric power against time of occurrence to illustrate the variance in a load during a given time
interval
[SOURCE: IEC 60050-617:2009, 617-04-05, modified – "curve representing supplied" has been
removed.]"
IEC 63341-3:2025 © IEC 2025
3.1.38
manufacturer
organization which has the technical and
commercial responsibility for its scope of supply
[SOURCE: IEC 62973-1: 2018, 3.1.13, modified – The specific use " or hydrogen fuel system>" has been added; "and commercial" has been added; "Note 1 to entry"
has been omitted.]
3.1.39
user
organization which will integrate or use
the fuel cell power system
Note 1 to entry: This can be the train integrator, or manufacturer, or also the train operator or railway undertaking.
3.2 Abbreviated terms
AC alternating current
DC direct current
ExMS exhaust management system
EMC electromagnetic compatibility
FCPM fuel cell power module
FCPS fuel
...