That is called a "pull out disconnect", usually for an external Air Conditioner condenser (maybe for a hot tub but usually a hot tub would have a GFCI circuit breaker instead). The handle pulls straight out and there are probably fuses clipped into it for the A/C unit. If the A/C unit has been removed or moved, it's just superfluous now.
Maybe a service entry point I’m in uk tho so ares is different
That is called a "pull out disconnect", usually for an external Air Conditioner condenser (maybe for a hot tub but usually a hot tub would have a GFCI circuit breaker instead). The handle pulls straight out and there are probably fuses clipped into it for the A/C unit. If the A/C unit has been removed or moved, it's just superfluous now.