What it is and what it does
The Siemens 3RU2116-1JB0-ZX95 is a SIRIUS thermal overload relay in Size S00, designed to protect motors against overload and phase failure. It mounts directly onto a contactor, saving panel space. The Trip Class 10 rating means it trips within 10 seconds at 7.2× the set current — standard for standard-start induction motors driving pumps, fans, and conveyors.
Key ratings and what they mean
Rated insulation voltage is 690 V, covering 400 V and 480 V systems with headroom. The auxiliary switch is integrated and rated for switching at 24 V 2 A, 120 V 3 A, 230 V 2 A, and 400 V 1 A — enough to signal a PLC input or drop out a contactor coil. The note "for message Tripped" indicates the auxiliary contact position signals the tripped state, not just the reset state. Mounting position is any, and the relay compensates for ambient temperature from -40 °C to +60 °C, so it works in unheated enclosures or near hot machinery. The screw terminals accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire — common for motor-circuit wiring.