The Siemens 3RU2116-1CB1-ZX95 is a SIRIUS thermal overload relay, size S00, designed for motor protection in control panels. It is a CLASS 10 device, meaning it trips within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a stall or locked-rotor condition without nuisance tripping on normal starts. The relay carries a rated insulation voltage of 690 V and is rated for switching currents at various control voltages: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V, among others. The auxiliary switch is integrated, and the overload release is thermal with temperature compensation from -40 to +60 °C.
Dimensions & Mounting
The relay measures 80 mm deep, 45 mm wide, and 89 mm high. It is designed for stand-alone installation — not a snap-on DIN-rail mount — so it requires screw fixing in the panel. The main circuit terminals are screw-type, accepting 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire. The screwdriver tip required is Pozidriv PZ 2 with a shaft diameter of 5 to 6 mm. Mounting position is any, which simplifies panel layout.