The W9 series circuit breaker is our standard size, magnetic circuit breaker. It is offered in one-, two, three- and four-pole models with a toggle actuator. W9 breakers are available in ratings from 250 milliamps through 50 amps, and can operate up to 65 volts DC, 277 volts AC or 480 volts AC when connected in a 3 phase-wye application. It is mounted with either U.S. or metric screws and is offered with stud terminals. Several different trip time delay curves may be specified. W9 series breakers are UL recognized and CSA certified. VDE approved types are also available.