Rated insulation voltage is 600 V per UL 508 and 690 V per IEC 60947-4-1, so it's comfortable on 400 V and 480 V line-to-line systems with headroom to spare. Breaking capacity is 110 A at 440 V, 80 A at 500 V, and 70 A at 660–690 V — enough to clear a fault on a moderate motor branch or resistive load circuit without upstream damage.
Screw-clamp terminals accept 1.5–4 mm² solid or 0.75–4 mm² flexible cable, with two wires per clamp possible for daisy-chaining.
Electrical performance and durability
Rated for AC-1 resistive load duty at 20 A. Electrical durability is 0.3 million cycles at that load; mechanical durability hits 5 million cycles, so the wear life is in the mechanism, not the contacts, for lightly loaded applications. Coil hold-in power is 3 W at 20 °C; average power-circuit impedance is 3 mΩ at 20 A 50 Hz, which keeps heat dissipation low inside a crowded cabinet. Maximum operating rate is 3600 cycles per hour — one per second — so it handles rapid reversing or transfer sequences without overheating.