400 A MCCB with TM220 release — line protection for high-fault panels
The Siemens SENTRON 3VA1340-6GE42-0AA0 is a 4-pole molded case circuit breaker rated 400 A continuous, designed for line protection in distribution panels. The TM220 thermal-magnetic release provides fixed overload and short-circuit curves — no electronic adjustment, which simplifies coordination in fixed-design switchboards. Breaking capacity reaches 154 kA at 415 V and 220 kA at 240 V, so it handles high available fault current without cascading upstream — a key spec for main or tie-breaker positions in industrial and commercial services. The 400 A rating holds across ambient temperatures from 40 °C to 50 °C; above that it derates linearly to 367 A at 70 °C. That matters when the breaker sits in a warm enclosure or near other heat sources.
Dimensions and mounting — fits standard MCCB footprints
At 184 mm wide, 248 mm tall, and 110 mm deep, this breaker occupies a standard 4-pole MCCB slot in a SENTRON panelboard or separate enclosure. The IP40 front protection suits indoor panel installations where tools or fingers might contact the front face. Maximum power loss of 92.1 W must be factored into the enclosure thermal budget — not a concern in a ventilated switchboard, but worth checking in a sealed stainless-steel box.