The GS1AH310 is the left-hand-mount external rotary handle for Schneider Electric's TeSys GS range of enclosed disconnectors, rated for switch bodies carrying 50 to 63 A. It is an IP65-rated handle with padlocking provision, finished in black — the same colour as the front plate.
This handle is classified as obsolete by the manufacturer.
The IP65 rating means the handle assembly withstands hose-down cleaning in food-and-bev or washdown environments — the seal protects the switch mechanism behind the panel door. The padlocking provision (with up to three padlocks) satisfies lockout/tagout requirements for the downstream load circuit.