What this MCCB carries
The Siemens 3VA1180-5EF32-0CA0 is a SENTRON molded case circuit breaker (MCCB) in the 3VA1 platform, sized for line protection in distribution panels. Three poles, 80 A continuous at 40 °C, with a TM240 thermal-magnetic trip unit — that's the fixed thermal and magnetic pickup for overload and short-circuit protection. The undervoltage release (UVR) is built in, so the breaker trips if control voltage drops, which is standard for emergency-stop or safety-disconnect circuits where loss of pilot power must open the main contacts.
Interrupting capacity — the number that matters for fault duty
At 240 V this breaker clears 187 kA symmetrical — that's a high-interrupting rating for a compact MCCB, meaning it can sit upstream of a high-fault transformer or bus without needing a current-limiting fuse ahead of it. At 415 V it's still 121 kA; at 440 V, 75.6 kA. The curve drops to 17 kA at 500 V and 690 V, which is still respectable for a 3-pole frame this size. If your panel's available fault current is north of 100 kA at 480 V, this isn't the right pick — you'd step to a larger frame or a fused switch. But for 240 V or 415 V distribution with high fault duty, the 187 kA / 121 kA numbers give you selectivity headroom without oversizing the enclosure.
Thermal derating and panel fit
Rated 80 A from 40 °C through 50 °C, then it starts stepping down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel ambient runs hot — say, a sealed enclosure next to a furnace line — you lose about 6 A off the nameplate by 70 °C. The frame dimensions are 130 mm tall, 76.2 mm wide, 70 mm deep, so it fits a standard 3-pole MCCB footprint on DIN rail or direct-mount backplate. Power dissipation is 21.7 W max, which is moderate for an 80 A frame — plan for that heat in the enclosure thermal calculation.