What this MCCB is and what it does
The Siemens SENTRON 3VA1150-5EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current, built for line protection in distribution panels and motor branch circuits. It carries a TM240 thermal-magnetic overcurrent release — the thermal element handles overloads, the magnetic element clears short circuits — and includes an integrated undervoltage release (UVR) that trips the breaker when control voltage drops below the dropout threshold.
Breaking capacity — what the ratings mean for your fault-current study
This MCCB is rated to interrupt 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. Those are the maximum fault currents the breaker can safely clear at each voltage level without welding contacts or rupturing the case.
Continuous current and thermal derating
The breaker carries its full 50 A rating from 40 °C through 50 °C ambient. Above that it derates: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C.
Physical fit and panel integration
The 3VA1150-5EF36-0BA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The front face carries an IP40 protection rating — fine for a clean indoor panel, but not for washdown areas. It mounts on a DIN rail or directly to a backplate via the screw terminals. The 3-pole footprint is standard for this class; plan for a 76.2 mm-wide slot in your panel layout.