MCCB for line protection — 200 A, 4-pole, 187 kA at 240 V
The Siemens SENTRON 3VA1220-5EF42-0BH0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 200 A at 40 °C ambient without derating. The breaking capacity reaches 187 kA at 240 V AC and 121 kA at 415 V AC — figures that cover most industrial distribution fault levels. An undervoltage release (UVR) is built in, and the auxiliary switch complement includes two auxiliary switches plus one trip alarm switch (HQ design). The 800 V rated insulation voltage gives headroom for 690 V line applications.
Current derating and thermal budget
The breaker holds 200 A from 40 °C through 50 °C ambient; above that it derates linearly to 176 A at 70 °C. Maximum power loss is 44.5 W — a figure that matters for enclosure heat rise when multiple breakers share a panel. The operating range spans -25 °C to +70 °C, with storage from -40 °C to +80 °C. Mounting dimensions are 158 mm height × 140 mm width × 70 mm depth, fitting standard SENTRON panel cutouts.