This document applies to transfer switching equipment (TSE), to be used in power systems for
ensuring the continuity of the supply and allowing the energy management of the installation,
by transferring a load between power supply sources, the rated voltage of which does not
exceed 1 000 V AC or 1 500 V DC.
Specific requirements for bypass/isolation transfer switch equipment are given in Annex C,
ATSE having closed transition capability are given in Annex D, stand-alone ATS controllers are
given in Annex E, and TSE for electric driven fire pump controllers are given in Annex F.
It covers:
– manually operated transfer switching equipment (MTSE);
– remotely operated transfer switching equipment (RTSE);
– automatic transfer switching equipment (ATSE), including the controller;
– stand-alone ATS controllers;
– bypass/isolation transfer switch equipment (BTSE);
– ATSE having closed transition capability;
– fire pump TSE.
It does not cover:
– TSE configurations that are not fully manufacturer type tested or marked according to this
document as a complete transfer switch;
– auxiliary contacts (for guidance, see IEC 60947-5-1);
– transfer switches used in explosive atmospheres (for guidance, see IEC 60079 (all parts));
– embedded software design (for guidance, see IEC TR 63201);
– cybersecurity aspects (for guidance, see IEC 63208);
– TSE rated for direct-on-line starting asynchronous motor of design NE and HE, according
to IEC 60034-12. (for guidance, see AC-3e utilisation category according to IEC 60947-4-1);
– other types of TSE under consideration including overlapping neutral TSE, multi-source TSE
(i.e. TSE with more than two sources of supply), TSE with load-shedding functions, bus-tie
TSE, and hybrid TSE;
– static transfer switches covered by IEC 62310 series.
NOTE TSE used for safety services and for emergency escape lighting systems as described in IEC 60364-5-56
are subject to specific rules and legal requirements.
The object of this document is to state:
a) the required characteristics of the equipment;
b) the conditions with which the equipment is to comply with respect to:
1) operation for which the equipment is intended;
2) operation and behaviour in case of specified abnormal conditions, for example, shortcircuit;
3) dielectric properties;
4) electromagnetic compatibility;
c) the tests intended to confirm that these conditions have been met and the methods for
performing these tests;
d) the product information to be provided by the manufacturer.

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