What the solid-state construction means for motor protection
The LR3D1532A1: Solid-state overload relays use a semiconductor sensor instead of a bimetal strip — the trip curve stays repeatable across ambient temperature swings and doesn't drift with age. That matters when the relay guards a motor that holds the unit on the grid; a thermal bimetal that shifts 5 % after a decade of cycling can nuisance-trip a critical pump.