The W57 series thermal circuit breaker is a compact single-pole, push-to-reset circuit breaker. This newer design breaker is roughly a third smaller than the W54 series breaker. W57 is available in ratings from 4 amps through 20 amps, and can operate up to 50 volts DC or 250 volts AC. It mounts via threaded bushing or a special-order snap-in bezel. It is offered with quick-connect terminals or special order PC terminals. W57 breakers are UL recognized for the U.S.A. and Canada, VDE approved, and CCC certified.