The GC2522B5 is a modular contactor from the Schneider Electric TeSys GC range — a 4-pole, 24 V AC 50 Hz coil unit rated for 25 A in the power circuit. It ships as a set of six, each clipping onto standard DIN rail. This is the kind of part you reach for when you need to switch motor, lighting, or heating loads in a panel and want the compact 2-module (36 mm wide) footprint.
The utilisation categories tell you what it's built for: AC-7A covers motor loads (think small pumps, fans, conveyors) and AC-7B covers resistive loads like lighting and heating. The electrical durability is rated at 100,000 cycles for both categories, with mechanical durability hitting 1,000,000 cycles — so it's not a throwaway part, but it's also not a high-cycle machine tool contactor. The rated breaking and making capacity of 68 A at 400 V (per IEC 61095) means it can handle short-circuit making and breaking up to that level, which is a good margin above the 25 A continuous rating. The control circuit is 24 V AC at 50 Hz, with a drop-out range of 0.2 to 0.75 Uc and an operational range of 0.85 to 1.1 Uc — so it drops out reliably below about 18 V and picks up cleanly above 20.4 V. Heat dissipation is 1.6 W per pole at 50/60 Hz, so four poles running full-tilt dump about 6.4 W into the enclosure — factor that into your thermal budget if you're packing a dense row of these.
The screw clamp terminals accept up to 6 mm² solid or flexible on the power circuit, and 2.5 mm² on the control circuit. Tightening torque is 0.8 N.m for both — don't over-crank it. Operating position is 30° from vertical, so you can tilt it slightly if the panel layout demands it, but keep it close to upright for reliable operation.