What this breaker is and what it does
The Siemens 3VA1032-4ED32-0HC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 3-pole unit rated at 32 A continuous, with a rated insulation voltage of 800 V — that's the voltage the internal clearances are built for, not the operating voltage you'd run it at.
Breaking capacity — the number that matters for fault duty
This breaker carries a breaking capacity of 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That's the maximum fault current it can safely interrupt at each voltage level — if your available fault current on the line side exceeds that, you need a current-limiting fuse upstream or a higher-rated MCCB.
Thermal derating — real-world current capacity
The 32 A rating holds steady up to 50 °C ambient. At 55 °C it derates to 31 A, and at 70 °C it's down to 30 A. That's a mild slope — you don't lose much headroom even in a hot enclosure, but if you're packing breakers tight in a panel above 50 °C, factor in that 1–2 A drop per circuit.
Built-in accessories and panel fit
This variant comes with a shunt trip (STL) for remote tripping and two auxiliary switches (HQ) for status feedback to a PLC or indicator lamp. No undervoltage release, no ground-fault monitoring, no communication module — it's a straightforward line-protection breaker. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep, so it fits a standard 3-pole MCCB slot in a SENTRON or generic distribution panel without surprises.