The Siemens SENTRON 3VA1150-4EF36-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 121 kA at 240 V and 75.6 kA at 415 V, making it suitable for high-fault-current distribution panels where selectivity with upstream breakers is required.
Breaking capacity and thermal derating
At 440 V the interrupting rating is 52.5 kA; at 690 V it drops to 11.9 kA — the voltage-dependent curve is typical for MCCBs and governs where this breaker can be applied in a 690 V system. The rated continuous current holds at 50 A up to 50 °C ambient, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Panel builders should account for the derating when the breaker is enclosed or mounted near other heat sources.
Physical fit and auxiliary contacts
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. It ships with 2 auxiliary switches (HP type) factory-installed, which provide status feedback to a PLC or indication circuit without needing a separate accessory. The front face carries an IP40 protection rating, adequate for enclosed panel use but not for washdown environments.