This part of the scope and purpose "Low voltage switchgear and control equipment" applies to control circuit appliances and switch components used for control, signal indication, interlocking, and other purposes in switchgear and control equipment. This section is applicable to control circuit appliances with rated voltage AC not exceeding 1000 V (frequency not exceeding 1000 Hz) or DC not exceeding 600 V. For control circuit appliances with a working voltage below 100 V AC or DC, see 4.3.2.2. This section applies to the following types of control circuit appliances: manual operated control switches, such as buttons, rotary switches, foot switches, etc—— Electromagnetic operated control switch with delayed or instantaneous action, such as contactor type relay—— Indicating switches, such as pressure switches, temperature sensitive switches (thermal switches), programmable controllers, etc—— Position switch. For example, a control switch operated by a machine or a part of a machine—— Relevant control circuit appliances, such as indicator lights, etc. Note 1: Control circuit appliances include control switches and related appliances, such as indicator lights. Note 2: Control switches include switch components and operating systems. Note 3: Switching elements can be contact elements or semiconductor components. This section also applies to specified types of switching components associated with other electrical appliances (whose main circuit meets other standards), such as auxiliary contacts for switching appliances (such as contactors, circuit breakers, etc.), which are not only used for controlling the coils of switching appliances—— Interlocking contacts on the shell door—— Control circuit contacts for rotary switches—— Control circuit contacts for overload relays. Contactor type relays should not only comply with the usage categories specified in this section, but also comply with the relevant requirements and tests of IEC 60947-4-1:2009+A1:2012. This section does not include relays or automatic electrical control devices for household and similar purposes mentioned in the GB/T 14598 or IEC 61810 series standards. The color requirements for indicator lights, buttons, etc. can be found in GB/T 4025-2010, and can also be found in CIEs 0004/E-2001 published by the International Commission on Lighting (CIE)
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