What this MCCB delivers
The Siemens SENTRON 3VA1220-6EF42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection. It carries 200 A continuously at 40 °C, with a breaking capacity of 220 kA at 240 V — enough to handle high-fault utility feeds or large transformer secondaries without cascading upstream. The 4-pole design covers three-phase plus neutral, common in North American and European distribution panels where the neutral needs overcurrent protection. Rated insulation voltage is 800 V, so it can be applied on 480 V and 600 V class systems with headroom. The shunt trip release (STL) allows remote tripping from a safety relay or emergency-stop circuit — useful for motor control centers where you need to kill power without walking to the panel.
Breaking capacity across voltages
The interrupting rating drops as system voltage rises: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. For a 480 V distribution board, the 75.6 kA figure is the one to check against the available fault current — if your service entrance can deliver 100 kA, this breaker needs an upstream current-limiting device.
Thermal derating and ambient limits
The breaker holds 200 A from 40 °C up to 50 °C without derating. Above that, current must be reduced: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. In a hot panel near a transformer or drive, factor in the actual ambient — a 200 A load at 60 °C would need the next frame size up.
Physical fit and panel integration
Dimensions: 70 mm deep, 140 mm wide, 158 mm high. It mounts on a DIN rail or bolts directly into a panel — the 4-pole width is standard for a 200 A frame. The auxiliary switch configuration (2 HQ switches) and the shunt trip occupy the accessory slots; verify clearance above and below for the 70 mm depth when wiring.