The Siemens 3VA1150-3EF36-0DA0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in distribution panels. It carries a 50 A rating at 40 °C and a breaking capacity of 75.6 kA at 240 V, which means it can safely interrupt fault currents up to that level on a 240 V line without the arc flashing upstream. That's the number that decides whether this breaker coordinates with your existing switchgear or needs a higher-rated upstream device. Three poles, TM240 thermal-magnetic overcurrent release, and an undervoltage release (UVR) built in — so it drops out if the control voltage falls, which is a common requirement for motor feeder circuits where you want a guaranteed trip on loss of control power. Rated insulation voltage is 800 V, giving headroom for 480 V and 600 V class systems.
Breaking capacity across voltages
The interrupting rating drops as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. If your panel's available fault current at the breaker's line side is, say, 40 kA at 480 V, this breaker's 32 kA at 440 V is the relevant comparison — you'd need to check coordination at the actual system voltage, not the 240 V number.
Thermal derating and ambient limits
Rated 50 A from 40 °C through 50 °C ambient. Above that it derates: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the panel runs hot — say a non-climate-controlled enclosure in a foundry or compressor room — that 45 A at 70 °C is the real continuous current you can count on. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Physical fit and panel integration
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB — it drops into a typical panelboard or enclosure cutout without adapter plates. No communication function, no ground-fault monitoring version, no trip indicator on the front. The undervoltage release is the only auxiliary release fitted.
Power loss
Maximum power loss is 17.1 W. That's the heat it dumps into the enclosure at full rated current — relevant for thermal calculations if you're packing multiple breakers in a sealed box.