What it is and what it does
The Siemens 3RU2116-0DC1 is a SIRIUS thermal overload relay, size S00, designed to protect motors against overload and phase failure. It is a Class 10 trip device, meaning it will trip within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a stalled-rotor condition. The relay mounts stand-alone in any position and connects via spring-loaded terminals, accepting 2x (0.5... 2.5 mm²) solid or stranded wire.
Key ratings and what they mean for fit
Rated insulation voltage is 690 V, covering 400 V and 480 V motor circuits common in European and North American panels. The auxiliary contact set is rated 2 A at 24 V and 3 A at 120 V — enough to signal a PLC input or drop out a contactor coil. At 400 V the relay is rated for a 0.09 kW motor; at 690 V it handles 0.12 kW. The operating frequency is 50... 60 Hz, so it works on both 50 Hz and 60 Hz supplies without derating.
Integration and mounting
Size S00 means it fits the compact SIRIUS footprint — 45 mm wide, 102 mm tall, 79 mm deep. It mounts in any position, stand-alone, with spring-loaded terminals that accept 0.5–2.5 mm² wire. The integrated auxiliary switch provides the tripped signal (the Note for message "Tripped" on the nameplate). Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across a wide ambient range.