The Siemens 3VA1140-4EF32-0BA0 is a 3-pole IEC molded-case circuit breaker on a 160 A frame, rated for breaking capacity class S with an Icu of 36 kA at 415 V AC. That 36 kA interrupting rating at 415 V means it can safely clear a bolted fault up to that level without welding contacts or venting gas into the panel — critical for main or feeder duty where the available fault current is high. The TM240 thermal-magnetic trip unit provides line protection with an adjustable overload Ir from 28 A to 40 A and a short-circuit pickup Ii adjustable from 5 to 10 times In, so you can dial in coordination with downstream breakers. An integral undervoltage release (UVR) at 24 V DC drops the breaker on loss of control voltage — typical for emergency-stop or safety-shutdown circuits where a voltage sag or E-stop pushbutton must kill the load.
What the ratings mean for panel integration
The 160 A frame size dictates the physical footprint and bus-bar spacing — this breaker occupies the same panel cutout as other 3VA1 frame 160 devices, so a panel layout already dimensioned for a 3VA1 will accept this unit without re-drilling. The UVR coil draws its 24 V DC from a separate control supply; verify that the power supply can source the inrush current (typically around 5-10 W for the UVR solenoid) without dropping below the dropout threshold. The TM240 thermal element is ambient-compensated per IEC 60947-2, but if the panel ambient exceeds 40 °C, apply the manufacturer's derating curve to the Ir setting to avoid nuisance trips.