IEC 60755-1:2022

IEC 60755-1 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
GROUP SAFETY PUBLICATION
General safety requirements for residual current operated protected devices –
Part 1: Residual current operated protective devices for DC systems

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IEC 60755-1 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
GROUP SAFETY PUBLICATION
General safety requirements for residual current operated protected devices –

Part 1: Residual current operated protective devices for DC systems

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-5867-5

– 2 – IEC 60755-1:2022 © IEC 2022
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 Classification . 9
5 Characteristics of residual current devices . 9
6 Marking and other product information . 12
7 Conditions for operation in service and for installation . 12
8 Requirements for construction and operation . 12
9 Tests . 15
Annex A (informative) Recommended diagram for short-circuit tests . 29
Bibliography . 32

Figure 118 – Example of test circuit for verification of ageing of electronic components . 27
Figure 200 – Examples of installation. 28
Figure A.101 – Diagram for all the short-circuit tests . 30

Table 100 – Example for values of rated operational voltage (U ) . 22
e
Table 101 – Values of influencing quantities . 22
Table 102 – Marking for DC-RCDs according to 4.15.1 . 23
Table 103 – Marking for DC-RCDs according to 4.15.2 and 4.15.3 . 24
Table 104 – Standard values of maximum break time for non-time-delay DC-RCDs . 24
Table 108 – Standard values of break time and non-actuating time for time-delay
DC‑RCDs . 25
Table 113 – Tripping current limits . 25
Table 130 – Withstand values and duration of temporary overvoltages . 25
Table 145 – Immunity tests . 26
Table 146 – Voltage dips and short interruptions levels . 26

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GENERAL SAFETY REQUIREMENTS FOR RESIDUAL
CURRENT OPERATED PROTECTED DEVICES –

Part 1: Residual current operated protective devices for DC systems

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
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IEC 60755-1 has been prepared by subcommittee 23E: Circuit breakers and similar equipment
for household use, of IEC technical committee 23: Electrical accessories. It is an International
Standard.
This document is intended to be used in conjunction with IEC 60755.
The text of this International Standard is based on the following documents:
Draft Report on voting
23E/1273/FDIS 23E/1299/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.

– 4 – IEC 60755-1:2022 © IEC 2022
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/standardsdev/publications.
A list of all parts in the IEC 60755 series, published under the general title General safety
requirements for residual current operated protected devices, can be found on the IEC website.
This International Standard is to be used in conjunction with IEC 60755:2017.
The following differing practices of a less permanent nature exist in the countries indicated
below:
– IEC 60755:2017, IEC 60755:2017, 5.3.1.12: 1 000 A, 2 000 A, 2 500 A, 7 500 A and 9 000 A
are also considered preferred values (Korea and Japan);
– IEC 60755:2017, IEC 60755:2017, 8.1.1: multiple settings are not allowed (Australia,
Germany, Denmark, the UK and Switzerland);
– IEC 60755:2017, IEC 60755:2017, 8.1.2: the colours red and green are not used for contact
position indication (US).
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,
• replaced by a revised edition, or
• amended.
INTRODUCTION
Residual current devices are used for protection against electric shocks.
In IEC 60364 (all parts), residual current devices are used for automatic disconnection of supply
in case of fault (see Clause 411 of IEC 60364-4-41:2005+AMD1:2017) and residual current
devices with rated residual operating current not exceeding 30 mA are used as additional
protection (see Clause 415 of IEC 60364-4-41:2005+AMD1:2017). The IEC has developed a
set of standards for residual current operated protective devices intended to be used in AC
systems.
DC systems are used for applications such as photovoltaic installations, data and telecom
centres and electric vehicle charging systems. In addition, standards for plugs and socket-
outlets for ICT equipment installed in data centres and telecom centres have been published.
Residual current devices for DC systems are used to provide fault protection and/or additional
protection (according to IEC 60364-4-41:2005 and IEC 60364-4-41:2005/AMD1:2017).
This document defines the operating characteristics for residual current operated protective
devices for DC systems. Details of how they should be installed to provide the desired level of
protection are specified in the various parts of the IEC 60364 series. The operating
characteristics given in this document are based on the information contained in IEC 60479 (all
parts).
This document has been prepared as a Group Safety Publication by subcommittee 23E in
accordance with its Group Safety Function for residual current devices. It is intended for use by
technical committees in the preparation of standards for residual current unit, function or
devices when it is intended to provide protective measures according to IEC 60364 (all parts).
It is not intended for use as a stand-alone document, for example, for certification.
This document is intended for use in conjunction with IEC 60755. Where a particular subclause
of IEC 60755 is not mentioned in this Part 1, that subclause applies as far as is reasonable.
Where this Part 1 states "addition", "deletion" or "replacement", the corresponding requirement,
test specification or explanatory material in IEC 60755 should be adapted accordingly.

– 6 – IEC 60755-1:2022 © IEC 2022
GENERAL SAFETY REQUIREMENTS FOR RESIDUAL
CURRENT OPERATED PROTECTED DEVICES –

Part 1: Residual current operated protective devices for DC systems

Replacement of Clau
...