What the 36 kA @ 415 V means for your line
The 3VA1332-4EF42-0BG0 is a Siemens 3VA1 IEC frame 400 molded-case circuit breaker with a breaking capacity class S rated at Icu = 36 kA at 415 V AC. It's a 4-pole unit (three phases plus switched neutral, though the N conductor is unprotected in this variant), so it fits IEC distribution panels where neutral isolation is required but overcurrent protection on the neutral is not. The thermal-magnetic trip unit is a TM240, ATAM type, with a rated current In = 320 A.
Built-in undervoltage release and auxiliary switch
The UVR will trip the breaker if control voltage drops below its dropout threshold — standard for emergency-stop circuits or safety disconnects where loss of control power must open the main breaker. Also included is one auxiliary switch changeover contact (1 C/O), giving you a remote status signal for the breaker position (open/closed). Both accessories are integrated at the factory, so no field-kit installation or wiring into the breaker mechanism is needed. Panel builders should note this is an IEC frame 400 breaker; it occupies a standard 3VA1 mounting footprint and accepts the usual 3VA1 busbar and cable connection accessories.