The Siemens 3RB3026-1RB0 is a SIRIUS solid-state overload relay in Size S0, rated for 690 V with a thermal current of 0.4 A and Trip Class 10E. It mounts directly to a contactor via the fastening method, saving DIN-rail space in a motor control center panel.
The thermal current rating of 0.4 A covers small motor loads; the 690 V rated value matches standard 400/480 VAC line voltages with headroom. The auxiliary switch is integrated and rated for various control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V. These ratings cover most PLC and relay logic inputs.
Fastens directly to a contactor (contactor mounting), no DIN-rail slot needed. Dimensions: 45 mm wide, 87 mm high, 84 mm deep. Accepts screw-type terminals for the main circuit; solid wire 1x (0.5…4 mm²) or 2x (0.5…2.5 mm²), stranded up to 2x 10 mm². Any mounting position. Vibration rated 1–6 Hz, 15 mm; 6–500 Hz, 20 m/s²; shock 15g / 11 ms.
Compliance and environment
Operating temperature -25…+60 °C with temperature compensation over that range. Storage and transport -40…+80 °C. Substance prohibitance date 10/01/2009, indicating RoHS compliance. The note for message 'tripped' refers to the signaling contact position during a fault condition.