3P Shunt Trip Bolt On Circuit Breaker 50A 240VAC QO load centers are the

QO load centers are the "World's Finest" designed with industry leading features for flexible application

As far as size goes

CSA CertifiedMax

: TEYL1045B / Product Name: GE TEYL1045B N 45A 480V 1P NEW / Amps: 45 / Volts: 480 / Poles: 1

3P Shunt Trip Bolt On Circuit Breaker 50A 240VAC QO load centers are the'Bolt On Circuit Breaker, 50 Amps, Number of Poles 3, Circuit Breaker Type Shunt Trip, AC Voltage Rating 240VAC, DC Voltage Rating 48VDC, For Use With Square D NQOD Panelboards, Series QOB, Terminal Connection Lug, Max. AIR Rating 10 kA, Frame Size 100A QO, Min. Wire Size 8 AWG, Max. Wire Size 2 AWG, Length 3. 00 In., Width 3. 00 In., Depth 2. 91 In., Standards UL Listed, CSA Certified'