scope:

This part of IEC 60947 applies to control circuit devices and switching elements intended for controlling, signalling, interlocking, etc., of switchgear and controlgear. It applies to control circuit devices having a rated voltage not exceeding 1 000 V AC (at a frequency not exceeding 1 000 Hz) or 600 V DC. This document applies to specific types of control circuit devices as contained in the following non exhaustive list: - manually operated control switches; - electromagnetically operated control switches, either time-delayed or instantaneous; - contactor relays; - pilot switches; - pressure switches; - temperature sensitive switches (thermostats); - programmers; - position switches; - control switches operated by part of a machine or mechanism; - associated control circuit equipment, for example indicator l ights; - control circuit devices incorporating semiconductor switching elements; - control circuit devices incorporating a built-in single drop digital communication interface. NOTE 1 - Control circuit devices and switching elements are referred to as "equipmen t" or "device" equally in this document.