MCCB for line protection — 200 A, 4-pole, TM240 release
The Siemens 3VA1220-5GF42-0JA0 is a SENTRON molded case circuit breaker configured for line protection. It carries a rated continuous current Iu of 200 A across four poles, with a TM240 thermal-magnetic overcurrent release — meaning the thermal element tracks sustained overloads while the magnetic instantaneous element handles short-circuit trips. The breaker is fitted with a shunt trip (STL) auxiliary release (order code 3VA9688-0BL32) for remote tripping, but has no undervoltage release, no auxiliary contact, no ground-fault monitoring, and no communication function — this is a pure power distribution breaker, not a multifunction device. Short-circuit breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V — these figures are the SCCR values the breaker can safely interrupt at each voltage level, so selectivity studies should use the voltage closest to your system's fault point. The 187 kA at 240 V is exceptionally high for a 200 A frame; it handles high-fault utility feeds without cascading upstream.
Thermal derating and panel fit
Rated 200 A continuous at 40 °C ambient, the breaker holds 200 A through 50 °C, then derates to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. If the panel ambient stays under 50 °C, no derating is needed — above that, the TM240 release's thermal element will trip earlier, so size your load to the derated curve. Dimensions: 140 mm wide, 158 mm high, 70 mm deep — the 70 mm depth is shallow enough for standard 600 mm deep enclosures with room for gland plates and wiring gutters. IP40 on the front face means it's protected against tools and wires >1 mm, but not against water ingress; keep it in a dry indoor panel.