Several incidents in industry indicated that switching devices (switching devices utilizing contactors) were being improperly designed, applied, and installed in low-voltage power circuit breaker switchgear. The Working Group (WG) for C37.13.1 will provide guidance in evaluating switching devices, other than low-voltage power circuit breakers conforming to IEEE Std C37.13, that are intended to be applied in metal-enclosed low-voltage power circuit breaker switchgear. These switching devices may be used in motor control or other repetitive duty applications and have the following characteristics: a) Drawout type, three-pole construction; b) Integral current limiting fuses for short-circuit protection; c)Power operated, with integral or separately mounted overcurrent protective device.
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