The Siemens 3RB3026-1RE0 is a SIRIUS solid-state overload relay in Size S0, rated for a thermal current of 0.4 A at up to 690 V. Spring-loaded terminals on the main circuit accept 1× 10 mm² stranded or 2× 0.25–1.5 mm² solid/stranded — no screw torque checks, just strip and insert. Mounting is direct onto a contactor, any orientation. The 45 mm width and 85 mm depth keep panel layout tight — it tucks into a Size S0 starter assembly without stealing extra DIN rail.
The integrated auxiliary switch on the 3RB3026-1RE0 signals the tripped state via a dedicated contact. Its switching capacity varies with voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.11 A at 220 V DC. At 24 V DC it easily drives a PLC digital input or a relay coil; at higher AC voltages the 3–4 A rating handles panel indication lamps or contactor hold-in circuits without an interposing relay. The note "for message 'tripped'" confirms this contact changes state only when the overload has operated — it's not a status mirror of the load current. Use it for a fault annunciator or to cut power to the drive enable, not for load monitoring.
The 3RB3026-1RE0 carries a lifecycle stage of "current" — Siemens still lists it as an active catalog number. No end-of-life or last-time-buy notice is on record.
Deployment context
This relay mounts directly onto a contactor rather than a DIN rail, so it stays with the starter assembly. The spring-loaded terminals and any-position mounting simplify panel wiring — no need to orient the relay for gravity drain or terminal access. Shock-rated to 15g / 11 ms and vibration-tested per 1–6 Hz / 15 mm and 6–500 Hz / 20 m/s², it holds up in applications near punch presses or conveyor drives.