What the 80 A rating means for your motor circuit
The GV4L80B6 is a 3-pole motor circuit breaker rated at 80 A continuous current, sized for a 37 kW motor at 400 V AC or 45 kW at 500 V AC — the power figures shift with supply voltage, so match the line voltage to the correct kW column in the spec table. The 80 A is the thermal continuous rating; the magnetic trip is set to 480–1120 A, catching short-circuit faults while letting motor inrush pass. This is a Category A breaker per IEC 60947-2 and AC-3 rated per IEC 60947-4-1, meaning it's built for direct motor switching with no intentional delay. Breaking capacity hits 50 kA at 240 V AC, 25 kA at 415 V, and 10 kA at 500 V — enough for most industrial panel fault levels, but verify the available fault current at your point of common coupling.
Where this part fits in the panel
Mounts in any position — no derating needed for orientation. The 81 mm width and 155 mm height fit standard DIN-rail spacing; depth is 165 mm including the rotary handle throw. Connection pitch is 27 mm without spreaders, 35 mm with, so plan the gland plate and busbar layout accordingly. Terminals accept lugs or ring terminals; torque to 9 N·m for 16–95 mm² cable, 5 N·m for 1.5–10 mm². Climatic withstand conforms to IACS for marine-adjacent applications — relevant if the panel feeds a shipboard or offshore load.
Durability and switching life
Mechanical durability is 40,000 cycles. Electrical durability at AC-3 (motor load) is 7,000 cycles at rated current, 14,000 cycles at half current — the 7,000-cycle figure governs if the motor runs near the 80 A limit. Maximum operating rate is 25 cycles per hour, so it's not a high-speed jogging breaker but fine for normal start/stop duty on conveyors, pumps, or compressors. Power dissipation per pole is 6.1 W at full load; three poles add 18.3 W to the enclosure heat budget.