The Siemens 3RU2116-0JB0-ZX95 is a SIRIUS thermal overload relay in Size S00, Trip Class 10, designed to protect motors against overload and phase failure by monitoring current and tripping the associated contactor when the thermal model reaches the trip threshold — the note on this variant reads "for message 'Tripped'", meaning it provides a dedicated signal output when the relay has operated. Rated for a main circuit voltage of 690 V, it carries switching capacities that vary with the control voltage: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V, among other points — these are the currents the integrated auxiliary switch can break, not the motor full-load current the overload relay is set to protect. Motor power ratings are given for several line voltages: 0.25 kW at 400 V, 0.37 kW at 500 V, and 0.55 kW at 690 V, all under AC-3e duty at the maximum rated voltage of 690 V.
Mounts directly onto a contactor via the contactor mounting fastening method — no DIN rail required, which saves panel width when paired with a matching SIRIUS contactor. Main circuit connections use screw-type terminals sized for M3 screws; the terminal accepts 2 x (0.5 to 1.5 mm²) or 2 x (0.75 to 2.5 mm²) solid or stranded wire. The screwdriver spec calls for a Pozidriv PZ2 tip with a shaft diameter of 5 to 6 mm.
MTTF under high-demand rate is 2,280 years.