What this MCCB carries and where it fits
The Siemens SENTRON 3VA1150-3EF36-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 50 A at 40 °C and a thermal-magnetic trip unit (TM240). Breaking capacity is 75.6 kA at 240 V, stepping down to 52.5 kA at 415 V and 32 kA at 440 V — enough for most industrial distribution panels with high fault current upstream. The shunt trip release (STL) lets you remotely trip the breaker via a control signal, useful for emergency-off or interlock circuits. Rated insulation voltage is 800 V, so it handles 480/600 V systems without derating the dielectric. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a 3-pole footprint that fits standard SENTRON panel cutouts. Power loss at rated load is 14.6 W, which matters for thermal budgeting inside a sealed enclosure. Ambient operating range is -25 °C to 70 °C, with no derating needed up to 50 °C; above that, current drops linearly to 45 A at 70 °C.