PowerPact B-frame circuit breaker, offers proven performance, flexibility, and reliability. PowerPact B-frame circuit breaker, offers proven performance, flexibility, and reliability. PowerPact B-frame circuit breakers provides economical thermal magnetic circuit protection with a breaking capacity of 25kA at 220 / 240 VAC50/60 Hz. PowerPact B-frame circuit breakers come in 1 to 4-pole unit mount construction also 1 to 3-pole I-Line construction.