The Siemens 3VA1180-3EF36-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A at 40 °C, 3-pole, designed for line protection in distribution panels. Its interrupting rating hits 75.6 kA at 240 V — enough for high-fault utility feeds — and derates through 52.5 kA at 415 V and 32 kA at 440 V, with 11.9 kA holding at 500 V and 690 V. That SCCR headroom means it coordinates cleanly downstream of a larger main breaker without cascading failure.
Ratings and what they mean for fit
The 80 A rating holds flat from 40 °C through 50 °C, then tapers to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. That thermal curve matters if the breaker sits in a warm enclosure near other heat sources — at 65 °C ambient you lose 6 A of headroom, so size the load at 75 A or less for continuous duty. Insulation voltage is rated 800 V, so it handles 480 V and 600 V class systems without derating the dielectric. The breaker ships with a shunt trip (STL) and an auxiliary switch block configured as 2 auxiliary switches plus 1 trip alarm switch (HQ). That gives remote trip capability and status feedback — useful for a PLC-based distribution monitoring scheme or emergency-off circuit. No undervoltage release or ground-fault module is fitted, so if those are needed they must be added externally.
Panel integration and mounting
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or panel-mount distribution boards. The 70 mm depth leaves room behind a 200 mm deep enclosure for wiring and finger-duct clearance. Power loss is 19.2 W maximum, so factor that into the enclosure thermal budget if grouping several breakers.