The Siemens 3VA1332-7FF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a fixed 160 A rating across all four poles — no adjustment range, so what you spec is what lands. The TM240 thermal-magnetic release handles overload and short-circuit protection without a separate trip unit.
Breaking capacity — what it means on a real fault
At 240 V this breaker interrupts up to 440 kA — that's a massive fault current, typical for a main or large feeder position close to a transformer. At 415 V and 440 V it still holds 242 kA, and at 500 V it's 154 kA. The 690 V rating drops to 17 kA, so if you're on a 690 V system this is not your main breaker; it's a downstream feeder or subfeed. The 4-pole construction means it switches all three phases plus neutral, common for TN or TT systems where the neutral needs protection.
Thermal derating — this is the real-world rating
The 160 A holds at 40 °C, 45 °C, and 50 °C — no derate needed in a typical panel. At 55 °C it drops to 313 A, at 60 °C to 306 A, at 65 °C to 299 A, and at 70 °C to 292 A. If your panel ambient runs hot, that's the number to size against, not the sticker. The maximum power loss is 80.1 W, which matters for enclosure heat load calculations in a sealed cabinet.
Integration — panel fit and wiring
The breaker measures 184 mm wide, 248 mm tall, and 110 mm deep. That depth is the key number for enclosure depth — 110 mm leaves room behind a standard 200 mm deep panel for wiring and bus bars. Front protection is IP40, so it's splash-safe from the front but not sealed against dust ingress through vents. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No undervoltage release, no trip indicator, no communication module — this is a plain-vanilla thermal-magnetic breaker for straightforward line protection.