What this MCCB delivers — and what the ratings mean for your panel
The SENTRON 3VA1150-6EF36-0HA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated current of 50 A at 40 °C ambient and holds that rating up to 50 °C; at 70 °C it derates to 45 A, so if your panel runs hot you need to account for the thermal curve. The interrupting capacity at 240 V AC is 220 kA, which means it can safely clear a fault up to that level without cascading upstream — that is a very high fault-current rating, typical for a main breaker in a high-capacity industrial distribution board. At 415 V it still delivers 154 kA, and at 690 V it drops to 17 kA; the voltage-dependent break is a standard characteristic of MCCB arc-extinction design. This unit includes a shunt trip (STL) auxiliary release, so it can be tripped remotely by a control signal — useful for emergency-stop circuits or remote load shedding. There is no undervoltage release and no communication module; it is a straightforward thermal-magnetic breaker with a TM240 overcurrent release. The insulation voltage is rated 800 V, giving headroom for 690 V line-to-line systems.
Panel fit and mounting dimensions
The breaker measures 76.2 mm wide by 130 mm high by 70 mm deep. That 3-inch width is standard for a 3-pole SENTRON 3VA frame — it clips onto a DIN rail or mounts via the rear slots. The depth of 70 mm means it will sit inside most 200 mm deep enclosures with room for wiring behind it. Verify the gland-plate clearance: the shunt trip terminals and power lugs add some projection past the 70 mm body.
Design and approvals context
Rated insulation voltage 800 V and a maximum power loss of 14.6 W under full load. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No ground-fault monitoring and no trip indicator — the shunt trip provides the remote tripping function.