What this MCCB is and what it does
The Siemens 3VA1150-6EF32-0HC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 50 A at 40 °C, derating to 45 A at 70 °C — per the datasheet, the thermal curve holds flat to 50 °C then drops one amp per 5 °C step. That matters if the breaker sits in a non-climate-controlled enclosure near a furnace line or motor drive bank. Breaking capacity is the headline spec here: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That 220 kA figure at 240 V places this squarely in high-fault-duty applications — large transformer secondaries, industrial mains, or utility tie points where available fault current exceeds what a standard 65 kA or 100 kA MCCB can interrupt. The 415 V and 440 V ratings (154 kA and 121 kA) still cover most European and Asian industrial distribution levels with headroom. Rated insulation voltage is 800 V, so the internal clearances and creepage are designed for 690 V systems without derating the insulation envelope. Power loss at rated current is 14.6 W maximum — relevant for thermal coordination inside a sealed panel.
Integrated accessories and wiring note
This variant ships with a shunt trip release (STL) and two auxiliary switches HQ factory-installed. The shunt trip allows remote tripping via a control voltage — typical for emergency-stop circuits or supervisory PLC override. The two HQ auxiliary switches provide position feedback (open/closed) to a DCS or status lamp. No undervoltage release is fitted on this order code, so if you need UVR for undervoltage protection on a motor feeder, this is not the variant. Dimensions: 130 mm height, 76.2 mm width (3 inches — standard MCCB footprint for panel busbar spacing), 70 mm depth. The 3-pole block occupies three 18 mm pole positions on a DIN rail or direct-mount plate. No communication function or ground-fault monitoring on this unit — it is a straight line-protection MCCB with remote trip capability.
Lifecycle and sourcing posture
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The shunt trip coil and auxiliary switches are rated for the same ambient envelope, but verify the shunt trip control voltage matches your panel's auxiliary supply — the evidence does not list the coil voltage on this order code.