The W33 series thermal circuit breaker is a larger product with a rocker actuator, an optional indicator lamp and an optional auxiliary switch. It is offered as a single-pole or a two-pole device in several different configurations. W51 is available in ratings from 5 amps through 20 amps, and can operate up to 50 volts DC or 250 volts AC. It conveniently snaps into a panel from the front and has quick-connect terminals which may also be used as solder tabs. W51 is UL recognized and CSA certified. This is the only thermal breaker that has two-poles and the only thermal breaker with an optional auxiliary switch that Tyco Electronics offers.