A ground fault circuit breaker in which both the fixed and movable contacts of the ground fault test switch are directly secured to the printed circuit board on which the ground fault detection circuit is implemented, with the movable contact also providing the spring bias for the test button....http://www.google.es/patents/US5293522?utm_source=gb-gplus-sharePatente US5293522 - Ground fault circuit breaker with test spring/contacts directly mounted to test circuit of printed circuit board
Ground fault circuit breaker with test spring/contacts directly mounted to ...
