IEC 60255-27:2023 Measuring relays and protection equipment—Part 27: Product safety requirements

IEC 60255-27:2023 specifies product safety requirements for measuring relays and protection equipment, as well as associated accessories such as shunts and instrument transformers. It applies to products with rated voltages up to 1000 V a.c. and 1500 V d.c., intended for indoor use at altitudes not exceeding 2000 m. This standard addresses hazards including electric shock and fire risks, and it does not cover functional performance, EMC requirements or installation safety on site.

This standard sets out safety criteria covering insulation, clearances, creepage distances, thermal overload, mechanical robustness, enclosure protection, marking and documentation. It also defines the relevant type tests and routine tests for compliance verification. It incorporates updates on risk assessment, short-time thermal overload and safety provisions for low-power transformer ports, to support safety validation and international acceptance of protection relay products.

LISUN supplies the fully test solutions for the following IEC 60255-27:2023, please see the below excel table:

IEC 60255-27:2023 Clause and Subject	LISUN MODEL
4.1.3 Equipment enclosure and barriers （IP Code）	SMT-529T
4.2 Protective impedance	LS9923
4.7 High leakage current	WB2675D
4.9 Clearances and creepage distances	CK-1
9.6.3 Clearances and creepage distances	CK-1
6.6 Flammability of materials and components	HVR-LS
6.9 Fire enclosures and flame barriers	HVR-LS
6.8 Conditions for a fire enclosure	ZRS-3H
9.6.1 Climatic environmental tests	GDJS-015B
9.6.2 Mechanical tests	LVD-100KG
9.6.4.2 Impulse voltage test	SUG255
Annex B Rated impulse voltages	SUG255
9.6.4.4 Insulation resistance	WB2681A
9.6.7.3 Impact test	IK07-10