It is designed to isolate and protect circuits in industrial power distribution panels, typically feeding motor control centers or large branch loads. The part carries a making capacity of 4000 A at 400 V AC-23B and a breaking capacity of 3200 A at 400 V AC-23B, so it can close onto and interrupt faults of that magnitude under motor-switching duty. Rated operational current is 400 A at 400 V AC-23A/B. Mounting via plate or rail; IP20 with terminal cover fitted.
This part is obsolete per the manufacturer. The buyer should confirm availability and lead time before committing the line.
The headline rating is 400 A at 400 V AC-23B — that is the motor-switching duty (AC-23B: switching of motors or other highly inductive loads, with occasional overloads). For a 400 V motor circuit, this disconnector can handle up to 400 A of motor starting current. The short-circuit withstand is 80 kA, meaning the body can hold through that fault level when protected by correctly sized BS fuses. The AC-23A and AC-23B ratings are identical at 400 A for 400 V, but at 690 V the current drops to 315 A for both duty classes. The DC ratings (poles not juxtaposed) are 315 A at 440 V and 200 A at 440 V — so for DC applications, the series connection of poles is required to reach the higher current figure.
The GS1QQB4 is designed to IEC 60269-1, IEC 60269-2, and IEC 60947-3. The body has a fire resistance of 960 °C (body) and 850 °C (fuse cover) per IEC 60695-2-1. The protective treatment is TH (tropicalized) for humid environments. These standards confirm the part is suitable for industrial power distribution under international norms.