What this MCCB is and what it does
The Siemens 3VA1180-6EF32-0DC0 is a SENTRON 3VA1 molded case circuit breaker (MCCB) rated 80 A continuous at 40–50 °C, with a 3-pole construction designed for line protection in distribution panels and industrial switchboards. Its 220 kA breaking capacity at 240 V drops to 154 kA at 415 V and 121 kA at 440 V, then to 17 kA at 500 V and 690 V — meaning it handles high available fault current at lower voltages but requires coordination study above 480 V. Rated insulation voltage is 800 V, so it can be applied in 480/277 V and 600 V systems with margin.
Thermal derating and enclosure fit
The breaker holds 80 A from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — a 7.5% drop from 50 °C to 70 °C that matters when the breaker sits in a crowded, poorly ventilated enclosure. Footprint is 70 mm deep by 76.2 mm wide by 130 mm tall — a standard MCCB envelope that drops into most Siemens 3VA panel bases without re-drilling gland plates. Maximum power loss at rated load is 21.7 W — factor that into the enclosure's thermal budget if you're stacking multiple breakers in a sealed box.
Built-in accessories and lifecycle status
This variant ships with an undervoltage release (UVR) and two HQ auxiliary switches pre-installed — no field retrofitting needed for shunt-trip or status feedback. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C — fine for unconditioned warehouses and most plant-floor environments.