The G12T3A80 is a GoPact MCCB 125 fixed-mount 3-pole circuit breaker with an 80 A TM-D thermal-magnetic trip unit. The thermal-magnetic trip gives you L (thermal overload) and I (magnetic short-circuit) protection — no ground-fault or long-time electronic adjustment, so it's a straight replacement for a thermal-magnetic MCCB in a distribution application. Rated operational voltage is 415 V AC 50/60 Hz, insulation voltage 440 V AC, both per EN/IEC 60947-2. Mount it horizontally or vertically flat on the backplate; screw terminals front-connected top and bottom with a 25 mm connection pitch.
It's a current-production catalog item in the GoPact MCCB 125 range.
Fixed-mount on a backplate with screw terminals — no DIN-rail adapter on this frame. Ambient operating range is -20 to 55 °C; storage from -35 to 85 °C. Operating altitude to 2000 m without derating, 2000-5000 m with derating.
Durability and dissipation
Mechanical durability is 30,000 cycles; electrical durability 8,000 cycles at 415 V at rated current. Utilisation category A means it's not intended for frequent motor switching under load; it's a distribution breaker, not a motor-starter combination.