The Siemens 3RB1035-1QB0 is an electronic overload relay from the SIRIUS 3RB10 series, rated for 6...25 A with a Class 10 trip characteristic. It uses screw terminals, offers manual reset only, and comes in the S2 mounting size for direct contactor mounting.
What the ratings mean for fit
The 6...25 A adjustment range covers standard IEC motor full-load currents for small to medium induction motors — think 2.2 kW to 11 kW at 400 V three-phase. The Class 10 trip class means it will ride through a normal motor start (up to about 10 seconds of locked-rotor current) without nuisance tripping, but still protect the motor winding on a sustained overload. That makes it a solid fit for pump, fan, and conveyor drives that don't need a longer start curve. Size S2 is the physical footprint for direct mounting onto Siemens SIRIUS 3RT2 contactors in the same frame size. The screw terminals accept standard power wiring — no special tooling needed for panel integration. Manual reset only means the relay latches after a trip and requires a physical button press to re-close the NC contact in the control circuit. This is standard for applications where an automatic restart after a fault would be unsafe — conveyors, saws, presses. If your line needs automatic reset after a momentary overload, this isn't the variant.
Sourcing and lifecycle
As a current-production part, the 3RB1035-1QB0 can be specified into a BOM with confidence that supply will continue. Availability and current pricing are confirmed at quote time against an RFQ through independent distribution.