The Siemens 3RB1025-1PB0 is an electronic overload relay rated for motor protection in the 1.5 to 6 A range.
Integration notes
The relay uses a manual-only reset — no auto-reset option, so plan for a remote reset pushbutton or a local operator intervention after a trip. The screw terminals accept the motor leads and the control loop; the contactor mount means it clips onto the S0 contactor without extra DIN-rail space. Verify the contactor coil voltage matches the control circuit before wiring.