The GS1AH040 is a front-mounted rotary handle from the Schneider TeSys GS range, designed for disconnect switches and circuit breakers rated 630 A through 1250 A. The black handle includes a padlocking provision, allowing lockout/tagout on the enclosure door without opening it.
The handle is an internal rotary type, meaning it mounts through the enclosure door and couples directly to the switch mechanism behind it. The 630-1250 A range covers the larger TeSys GS disconnect frames — if you're working with a 250 A or 400 A GS1 switch, this handle won't fit. The black colour is standard for the GS1 line; padlocking capability means it accepts a standard padlock hasp for lockout compliance.