What it is and what it does
The Siemens 3VA1180-3EF36-0KA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, fitted with a TM240 thermal-magnetic overcurrent release and a shunt trip release (STL) for remote tripping. Rated 80 A continuous at 40 °C across all three poles, it holds that rating through 50 °C before a gentle derating curve begins — 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. The interrupting capacity tells you where it can sit in the fault hierarchy: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA at 240 V means it handles high available fault current on a 240 V secondary without needing an upstream current-limiting fuse — a real panel-space saver. Rated insulation voltage is 800 V.
Panel fit and integration
Three-pole construction, 76.2 mm wide, 130 mm tall, 70 mm deep. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Maximum power dissipation is 19.2 W — plan for that heat in a sealed enclosure. No communication module, no ground-fault monitoring, no undervoltage release on this variant. The shunt trip (STL) is the only auxiliary release fitted — if you need UVR or a separate alarm contact, that's a different order code in the 3VA family.