Molded case circuit breaker for line protection
The Siemens SENTRON 3VA1150-6EF36-0AF0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it guards cable and busbar runs against overload and short-circuit faults, not motor or generator circuits. Rated 50 A continuously at 40 °C ambient, it carries the full current without derating up to 50 °C; above that the thermal curve pulls back to 49 A at 55 °C and 45 A at 70 °C. The TM240 thermal-magnetic release provides fixed overload pickup and instantaneous magnetic trip, factory-set for distribution feeder applications.
Breaking capacity across the voltage range
Short-circuit performance is voltage-dependent: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. That 220 kA figure at 240 V places it in the high-interrupting category for North American 240/120 V distribution panels; the 17 kA at 690 V still covers most European industrial feeders. Rated insulation voltage is 800 V, so the breaker can be applied on 690 V systems without series-connected devices.
Built-in auxiliary and alarm switching
Factory-fitted with one auxiliary switch and one trip-alarm switch (HQ type), so the breaker reports its open/closed state and whether it tripped on fault — no separate accessory block to order and install. The auxiliary switch shares the same internal mechanism as the base switch 3VA11506EF360AA0, ensuring contact alignment. No undervoltage release, no ground-fault monitoring, and no communication module on this variant; it is a pure standalone line-protection MCCB.
Panel fit and environmental limits
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting plates and third-party DIN-rail adapters. Operating temperature range -25 °C to +70 °C; storage range -40 °C to +80 °C. Maximum power loss 14.6 W, which matters for enclosure thermal calculations when multiple breakers are ganged. Trip indicator is present, so a quick visual scan of the panel shows which breaker cleared the fault.