The Siemens 3RB3026-2PE0 is a SIRIUS solid-state overload relay, size S0, designed to protect motors against overcurrent and phase loss. It uses an electronic overload release with CLASS 20E trip curve, meaning it allows a 20-second cold-start overload before tripping — standard for standard-duty induction motors driving pumps, fans, and conveyors. Rated for operational voltages up to 690 V and a thermal current of 4 A (at 480 V and 600 V rated value), this relay covers smaller motor loads in the S0 frame. The spring-loaded terminals accept 2x (0.25 to 1.5 mm²) solid or stranded wire, with a single 10 mm² stranded conductor option for the main circuit.
Any mounting position is permitted, and the relay includes an integrated auxiliary switch with signaling contact 97/98 that changes state on trip. The auxiliary switch carries rated values of 4 A at 120 V AC, 3 A at 230 V AC, and 2 A at 24 V DC — enough to drive a PLC input or indicator lamp directly. Shock resistance is 15g / 11 ms per IEC 60068-2-27, with the signaling contact derated to 9g / 11 ms in the tripped position.