The Siemens 3VM1220-3ED42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous current across a 40 °C to 50 °C ambient band — no derating needed until you cross 55 °C, where it steps down to 194 A, then 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. That thermal curve matters when this breaker sits in a crowded panel next to other heat sources; the TM210 thermal-magnetic release is fixed at 200 A Ir max with an instantaneous pickup adjustable up to 2000 A li max. Four poles, line protection version, no ground-fault monitoring or N-conductor protection built in.
Breaking capacity across voltage levels
This MCCB interrupts 76 kA at 240 V AC, 53 kA at 415 V AC, 32 kA at 440 V AC, and 11.9 kA at 500 V AC. The 415 V figure is the one most panel builders will anchor to for European 400 V three-phase distribution; the 240 V rating covers North American 240/120 V split-phase or 240 V delta feeds. Maximum rated operational voltage for DC applications is 500 V.
Panel footprint and integration
Dimensions are 158 mm high, 140 mm wide, 70 mm deep — a 4-pole MCCB that fits standard enclosure backpan layouts without needing extra gland-plate clearance on the sides. IP40 on the front means it is protected against tools and wires >1 mm entering the front face; the rest of the enclosure must provide the overall IP rating. Maximum power loss is 42 W, so factor that into thermal calculations for sealed cabinets.