What this MCCB carries and where it fits
The Siemens 3VA1220-5EF42-0KC0 is a SENTRON molded case circuit breaker (MCCB) rated at 200 A continuous current across the 40 °C to 50 °C band — it holds full rating up to 50 °C, then derates to 176 A at 70 °C. Four poles, line-protection design, with a shunt trip release (STL) and two auxiliary switches HQ built in. Interrupting capacity runs 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — so it handles high-fault utility feeds and large motor branch circuits without cascading upstream.
Panel fit and thermal planning
Footprint is 70 mm deep, 140 mm wide, 158 mm tall — a standard SENTRON 3VA frame size that drops into existing panel layouts without re-drilling. Maximum power loss is 42 W, so factor that into enclosure thermal rise calculations, especially if the panel is densely packed or installed in a warm machine cabinet.
What the interrupting ratings mean for coordination
The 187 kA at 240 V is the peak short-circuit current this breaker can safely interrupt — useful for main service entrance panels where fault current is high. At 690 V the rating drops to 17 kA, still enough for most 690 V motor drives and industrial loads. The 800 V rated insulation voltage gives headroom for 690 V systems plus a safety margin.