Relays

This standard is applicable to measuring relays and protection equipment for power system protection, including the control, monitoring and process interface equipment used with those systems (hereinafter named apparatus). (Published Document (JS))

This part of IEC 1812 applies to specified time relays, such as time delay relays, in accordance with definitions as laid down in IEC 50(446), for use in industrial applications (e.g. control, automation, signal and industrial equipment). The term “relay” as used in this standard comprises all types of relays, other than measuring relays, with specified time function. (Published Document (JS))

This International Standard describes the product safety requirements for measuring relays and protection equipment having a rated a.c. voltage up to 1 000 V with a rated frequency up to 65 Hz, or a rated d.c. voltage up to 1 500 V. Above these limits, IEC 60664-1 should be used for the determination of clearance, creepage distance and withstand test voltage. (Published Document (JS))

This standard gives general requirements for the insulation coordination of measuring relays and protection equipment (Published Document (JS))