September 13th, 2013, Published in Articles: Vector

The ABB fireman’s switch range comprises two, three and four pole options with a maximum operational current rating of 32 A. A feature not often discussed is the range’s ability to operate the under-voltage release or shunt trip in the main incoming circuit breaker. In the event of fire, emergency services can isolate the utility supply to the building simply by opening the switch. The under-voltage release is fed through one of the main contacts of the fireman’s switch, when the voltage is removed the breaker trips. Flexible wiring allows for the shunt trip to be fed through the N/C auxiliary contact, when the switch closes the auxiliary contact opens, powering the shunt trip and trips the breaker. Versatile design allows the ‘0’ position to be configured either vertically up or down, to meet local regulations.

Contact Paul Louw, ABB, Tel 010 202-5916,

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