The Siemens SENTRON 3VA1332-6EF42-0CA0 is a 4-pole molded case circuit breaker (MCCB) rated 320 A at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). Its 154 kA breaking capacity at 415 V gives you the headroom to handle high-fault utility feeds or transformer secondaries without cascading upstream — that's the kind of SCCR that keeps a main breaker from becoming a fuse.
Rated insulation voltage is 800 V, so it's comfortable in 480 V and 600 V class systems. The TM240 release means the thermal pickup is fixed at 320 A; magnetic trip is adjustable within the TM240 range. If you're used to the 3VA1112-5EE32-0AA0 (a 3-pole 320 A frame with lower breaking capacity), this 4-pole variant with the UVR is the part you reach for when you need both neutral protection and undervoltage lockout on the same frame.
Mounts on a standard DIN rail or panel-mount plate. Dimensions are 248 mm high, 184 mm wide, 110 mm deep — fits the common SENTRON 3VA frame footprint. The undervoltage release (UVR) is factory-installed, so you don't need to add an accessory module; wire it to a control transformer or safety relay to drop the breaker on loss of control voltage. Four poles mean it switches all three phases plus neutral — typical for a main breaker in a 4-wire distribution panel.