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Joined: Jan 2005
Posts: 5,445
Likes: 2
Cat Servant
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It has been a while since I put in a shunt-trip ... but if I recall correctly ...

The breaker took up three spaces. Two had large lugs, and were clearly for the panel feed. The third had a much smaller lug, and was for the wire to the 'kill' switch. The other side of the switch went to the neutral buss.

I was under the impression that closing the switch created a dead short, tripping the breaker. It sure sounded that way! I have since been corrected, and that there actually is a mechanism inside that operates ... a 'load,' as it were.

Joined: Dec 2000
Posts: 4,294
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Shunt trip circuit breakers work because of a small magnet coil that operates the magnetic trip mechanism.

Large (not molded case) breakers can be field modified with a kit that contains a coil with leads on it and installation instructions.

It's amusing to see how small a coil it takes to trip a big circuit breaker.




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