What it is and what it does
The Siemens 3RB1035-2QB0 is an electronic overload relay sized for contactor mounting, covering the 6…25 A range with a Class 20 trip curve. The screw connection terminals match standard panel wiring practice, and the relay is configured for manual reset only — no auto-reset option on this variant. Size S2 footprint keeps the assembly compact on the DIN rail.
What the ratings mean for fit
The 6…25 A adjustment range covers motor FLA from fractional-horsepower up to roughly 7.5 kW at 400 V three-phase, depending on service factor. Class 20 means the relay allows up to 20 seconds of locked-rotor current before tripping — standard for general-purpose induction motors driving pumps, fans, and conveyors where start-up is not prolonged. Manual reset keeps the circuit locked out after a trip, which is the typical requirement for unattended or safety-monitored lines.