International Electrotechnical Commission

Low-voltage switchgear and controlgear – Part 5-8: Control circuit devices and switching elements – Three-position enabling switches - Edition 1.0
 N 60947-5-8

Annotation

This part of IEC 60947 specifies requirements for three-position enabling switches.

These switches are used as components of enabling devices described in 10.9 of IEC 60204-1 to provide signals that,

a) when activated, allow machine operation to be initiated by a separate start control, and

b) when de-activated,

i) initiate a stop function, and

ii) prevent initiation of machine operation.

NOTE 1 The enabling control function is described in 9.2.6.3 of IEC 60204-1.

NOTE 2 This standard does not deal with enabling devices.

This standard does not apply to:

three-position enabling switches for non-electrical control circuits, for example hydraulic, pneumatic;

enabling switches without three-position mechanism;

emergency stop devices (see IEC 60947-5-5).

Автоматический перевод:

Низковольтная коммутационная аппаратура и controlgear – Часть 5-8: Устройства цепи управления и переключающиеся элементы – Трехпозиционные переключатели предоставления возможности - Издание 1.0