Panel fit and form factor
The GS1ND4 measures 5.7 in deep by 12.3 in wide by 7.7 in tall — that's a 146 mm by 313 mm by 195 mm footprint on the mounting plate. Plate-mounted, not DIN-rail, so plan the backplate layout accordingly; the direct right-side operating handle needs clearance for swing arc.
Rated current and switching duty
Rated operational current is 250 A at 400 V in both AC-23A and AC-23B duty classes — that's the heavy motor-switching category per IEC 60947-3, meaning it handles frequent on-load switching of motors and other inductive loads. At 690 V with the terminal cover fitted, it still delivers 250 A in AC-23A/B. The conventional free-air thermal current (Ith) is also 250 A at 104 °F (40 °C), so the rating holds without derating in a warm panel. Rated operational power hits 132 kW at 400 V, 160 kW at 500 V, and 220 kW at 690 V — match these to the motor nameplate kW, not the FLA alone, because the AC-23B making capacity is 2500 A at 400 V and the breaking capacity is 2000 A at 400 V. That's the short-circuit making and breaking the switch must survive during a fault.
Fuse coordination and short-circuit withstand
This is a switch-disconnector-fuse — it takes DIN-style fuses, size 1. The short-circuit withstand rating is 32.5 kA, and with gG fuse protection the rated short-circuit making capacity (Icm) jumps to 100 kA at 400 V. That means the fuse clears the fault before the switch contacts weld, letting you coordinate downstream selectively. Rated impulse withstand voltage (Uimp) is 8 kV, and insulation voltage (Ui) is 750 V AC at 50/60 Hz — this covers 480 V and 600 V class systems with margin. The 4-pole configuration with 4 NO contacts and 4 protected poles gives full isolation on all phases plus neutral if needed.