The Siemens 3RB3026-1SE0 is a SIRIUS solid-state overload relay, Size S0, designed to protect AC motors against overload and phase failure. Rated voltage is 690 V, with AC-3e rated value maximum also at 690 V, meaning it's suitable for switching motor loads on 400 V and 480 V systems with headroom. The integrated auxiliary switch signals the tripped state — the Note for message "tripped" confirms the relay provides a dedicated signal output when it has operated. Mounting is via contactor mounting (directly onto a matching SIRIUS contactor), saving DIN rail space and simplifying wiring.
The 3RB3026-1SE0 uses spring-loaded terminals for the main current circuit, accepting 1x 10 mm² stranded or 2x (0.25 to 1.5 mm²) solid/stranded. The auxiliary circuit (signaling contact) accepts 2x (0.25 to 1.5 mm²) solid or stranded. The screwdriver shaft diameter is 5 to 6 mm, Pozidriv PZ 2 tip. Dimensions are 45 mm wide, 109 mm high, 85 mm deep — the S0 form factor matches the 3RT2 contactor series for a direct mechanical link. Mounting position is any, which helps in tight enclosures. Vibration resistance is 1-6 Hz at 15 mm amplitude, 6-500 Hz at 20 m/s² for 10 cycles; shock resistance is 15g for 11 ms (signaling contact 9g / 11 ms when tripped).