What this MCCB carries
The Siemens 3VA1180-6MH32-0DC0 is a SENTRON molded case circuit breaker (MCCB) built for starter protection — meaning it's sized to sit ahead of a motor starter, handling both overload and short-circuit fault clearing in one enclosure. Three poles, rated 80 A continuous at 40 °C with no derating until you push past 55 °C, where it drops to 78 A and then 74 A at 70 °C. That thermal curve matters if this lives in a hot panel next to drives or transformers. Breaking capacity is the headline: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V. Those numbers drop sharply above 500 V — 7.5 kA at both 500 V and 690 V — so if your line runs 690 V, this is not the high-fault unit you want. The 220 kA at 240 V tells you it handles serious utility-side fault current on a 240 V delta service.
Panel fit and auxiliaries
Footprint: 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). Comes with an undervoltage release (UVR) built in and two HQ auxiliary switches. The UVR means the breaker trips if control voltage drops — common for emergency-stop chains or safety circuits where loss of power must open the motor circuit. The auxiliary switches give status feedback to a PLC or indicator lamp without extra add-on modules. Rated insulation voltage is 800 V, so the internal clearances and creepage are sized for 690 V systems even though the breaking capacity at that voltage is limited. Power loss at full load is 21.7 W — factor that into enclosure heat rise if you're stacking several breakers in a sealed panel.