3VA1150-6EF32-0JC0 — 50 A SENTRON MCCB with TM240 Release and Shunt Trip
The Siemens SENTRON 3VA1150-6EF32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 50 A and a rated insulation voltage Ui of 800 V. Its TM240 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings for standard feeder and distribution protection. Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. That 220 kA figure at 240 V means this breaker can safely interrupt a fault current up to 220,000 A at that voltage without rupturing — essential for high-fault installations like transformer secondaries or large busway feeds where available short-circuit current is extreme. The breaker includes a shunt trip (STL) auxiliary release (order code 3VA9688-0BL32 for the integrated auxiliary trip) and two HQ auxiliary switches, giving remote trip capability and status feedback without needing an external undervoltage module. No undervoltage release, no ground fault monitoring, and no communication function are fitted on this variant.
Current Derating and Thermal Limits
The 50 A rating holds flat from 40 °C through 50 °C ambient, then steps down: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. That 5 A drop from 50 °C to 70 °C is modest — the TM240 release runs cool enough that a panel hitting 60 °C ambient still delivers 47 A continuous. Operating range spans -25 °C to 70 °C; storage range -40 °C to 80 °C.
Panel Integration and Dimensions
The 3VA frame measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without oversizing the backpan. Front-face protection is IP40, so it's suitable for general-purpose indoor panels but not washdown environments. The 15,000-cycle mechanical endurance is typical for this class; expect it in a panel that sees occasional switching rather than daily motor-starting duty.