The Schneider Electric GS1ANT22G is an auxiliary contact block from the TeSys GS range, designed as a right-side add-on for the GS2 switch-disconnector when it's fitted with a left-side external handle. Its conventional free-air thermal current (Ith) is rated at 20 A at 40 °C, which is the thermal limit for the contact block itself in open air. What actually governs your circuit design is the rated operational current (Ie) under specific duty categories: for AC-15 (solenoid, electromagnetic load) it handles 10 A at 230 V, 8 A at 400/415 V, and 6 A at 440 V. For DC-13 (solenoid with parallel diode suppression) it's rated 4 A at 48 V, 1.2 A at 110 V, and 1 A at 220 V DC.
The GS1ANT22G mounts on the right side of a GS2 switch-disconnector that already has a left-side external handle. It's a clip-on addition, no extra wiring to the main switch poles — the contacts are mechanically driven by the switch's internal mechanism. The instantaneous contact operation means there's no delay; the NO and NC change state as soon as the handle moves. The contacts are rated for 30,000 electrical cycles under AC-15 duty and 30,000 mechanical cycles, so it's built for the same service life as the switch it's attached to. If you're wiring it into a 24 VDC control circuit, pay attention to the DC-13 ratings — at 24 V it'll comfortably handle the typical relay and PLC input draw, but the 1 A at 220 V DC rating tells you this isn't meant for heavy DC motor braking or large DC solenoids.
The 20 A Ith rating is the thermal current the block can carry continuously in free air at 40 °C — think of it as the wiring limit for the terminal block itself. The AC-15 and DC-13 ratings are the ones that matter for switching inductive loads like contactor coils, solenoid valves, or small relays. AC-15 specifically covers electromagnetic loads with high inrush (like a contactor coil pulling in), so if you're using this to signal a contactor's status back to a PLC, the 10 A at 230 V AC-15 rating gives you plenty of headroom. The fuse type listed is NFC BS DIN — that's the standard for the fuse holder or fuse type the switch-disconnector itself accepts, not a rating of the contact block. It tells you the GS2 switch body this attaches to is designed for NFC (French), BS (British), or DIN (German) standard fuses, which covers most common fuse formats in industrial panels.