What this breaker does and where it fits
The Siemens SENTRON 3VA2040-6KP32-0AA0 is a 3-pole molded case circuit breaker rated at 40 A continuous, with an ETU850 electronic trip unit. It's built for line protection in distribution panels and motor control centers where you need high interrupting capacity — 242 kA at 240 V and 187 kA at 415 V — so it handles fault currents at the main or sub-main level without cascading upstream. The IP40 front protection means it's fine in a clean indoor panel; keep it out of washdown zones.
Breaking capacity and selectivity
At 690 V the breaker still clears 3 kA, which is enough for most industrial line-to-line faults in a 690 V system. The 187 kA at 415 V gives you headroom for high-fault installations — think transformer secondaries or large motor starters. The ETU850 trip unit supports adjustable overload and short-time pickup, so you can coordinate with downstream breakers and avoid nuisance trips.
Panel integration and dimensions
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panels. The front face is IP40, so it's suited for enclosed switchboards. No undervoltage release or ground-fault monitoring built in; those are add-on options if your spec requires them.