The Siemens SIRIUS 3RB3026-2SB0 is a solid-state overload relay — size S0, rated thermal current 12 A continuous, with a CLASS 20E trip curve. It mounts directly onto a contactor (contactor mounting), not on a DIN rail — so it pairs physically with a matching SIRIUS contactor frame to form a compact motor starter. The auxiliary switch is integrated, and the note on the part is for message 'tripped' — meaning the relay outputs a dedicated signal when the overload has operated, useful for PLC or HMI annunciation.
The part carries a substance prohibitance date of 10/01/2009.
The relay is 45 mm wide, 87 mm high, 84 mm deep — a compact S0 footprint that fits in a standard motor starter stack. Main circuit terminals accept 1x (0.5...4 mm²) solid or 2x (0.5...2.5 mm²) stranded; the auxiliary circuit takes up to 2x 10 mm² stranded. Screw terminals require a Pozidriv PZ2 tip with a 5–6 mm shaft diameter. Mounting position is any orientation. Shock resistance is 15g / 11 ms on the main contacts; the signaling contact in 'tripped' position is rated 9g / 11 ms. Vibration resistance per IEC 60068-2-27: 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s², 10 cycles.