125 A Switch-Disconnector-Fuse for Motor Branch Circuits
The GS1KKD4 is a TeSys GS switch-disconnector-fuse, rated 125 A at 400 V in AC-23A and AC-23B duty — the AC-23 category covers switching of motor loads and other highly inductive circuits. The 4-pole configuration (4 NO contacts) with fuse size 00 DIN accommodates gG or aM fuse links for short-circuit protection up to 20 kA withstand. Rated operational power reaches 63 kW at 400 V, 90 kW at 500 V, and 90 kW at 690 V, making this a fit for motor branch circuits in the 60–90 kW range depending on line voltage. The making capacity is 1250 A at 400 V AC-23B, and the breaking capacity is 1000 A at the same duty — both figures confirm the switch can close onto and interrupt fault currents within its rating.
Mounting, Termination, and Environmental Specs
Plate-mounted (Mounting Support: Plate), the GS1KKD4 measures 7.3 in wide by 6.4 in tall by 5.0 in deep — the depth includes the operating handle on the direct right side. Power circuit termination accepts bars or lugs/ring terminals for 35–95 mm² flexible copper, torqued to 12 N·m. IP20 with the terminal cover fitted (IEC 60529) — finger-safe but not sealed against moisture; install in a suitable enclosure for washdown or outdoor environments. Ambient operating range is -20 °C to +70 °C, storage from -40 °C to +80 °C. The body withstands 960 °C glow-wire (IEC 60695-2-1), the fuse cover 850 °C.