The Siemens 3RB1246-1QM00-0AA0 is a solid-state overload relay from the 3RB1 family, covering a 6.3-25 A adjustment range. It sits in the relay category under circuit breakers, fuses and protection — meaning it's the piece that watches motor current and trips when the load gets too heavy for too long, protecting the windings from heat damage.
What the rating means in the panel
The 6.3-25 A range covers small to medium three-phase motors. The solid-state design means no bimetal strip to drift, so the trip curve stays consistent across ambient temperature swings inside the enclosure.