The Siemens SENTRON 3VA1220-4EF42-0AB0 is a 4-pole molded case circuit breaker (MCCB) rated 200 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release. It delivers 121 kA breaking capacity at 240 V, derating to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that govern fault-clearing capability across common distribution voltages. This is a line-protection design — meaning it's intended for feeder and main breaker duty, not motor branch circuit protection where a motor-circuit protector or combination starter would be the right call. The 42 W maximum power loss is a heat budget number for enclosure thermal calculations.
Dimensions are 140 mm wide, 158 mm high, 70 mm deep — a standard SENTRON 3VA footprint for 4-pole frames in this current class.