What it is and what it does
The Siemens 3VA1180-3EF32-0BC0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in distribution panels. Three poles, rated 80 A continuous at 40 °C, with an interrupting capacity of 75.6 kA at 240 V AC — that's the number that tells you it'll clear a serious fault without welding its contacts shut or blowing apart. Insulation voltage rated 800 V, so it's comfortable in 480 V or 600 V systems too.
Ratings that matter for fit
The 75.6 kA interrupting rating at 240 V is the headline — that's the SCCR the breaker can safely interrupt without upstream coordination failure. At 415 V it still holds 52.5 kA, at 440 V it's 32 kA, and at 500 V or 690 V it drops to 11.9 kA. That derating curve is what you check against your available fault current at the panel. The 80 A rating holds from 40 °C up to 50 °C; above that it derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel runs hot, that's the number you size by, not the 80 A sticker. Power loss maxes at 21.7 W — that's the heat it dumps into the enclosure. For a multi-breaker panel, that adds up and drives ventilation or derating choices. The breaker includes an undervoltage release and two HQ auxiliary switches, so it's ready for remote status and shunt-trip control without add-on modules.
Panel fit and integration
Dimensions: 130 mm tall, 76.2 mm wide, 70 mm deep. That 70 mm depth is the key for enclosure clearance — it's shallow enough for most 200 mm deep panels but check your gland plate and door swing. Three-pole, line protection design, no communication function, no ground-fault monitoring built in. The supplied basic switch is order code 3VA11803EF320AA0; the auxiliary switches are HQ type, two of them. Mounts on a DIN rail or direct panel, standard SENTRON footprint.