What it is and what it does
The Siemens 3RU1116-1EB1 is a SIRIUS thermal overload relay, Size S00, with Class 10 trip. It protects AC motors against overload and phase failure. Rated for AC-3 duty up to 690 V, it handles the switching of motor loads within that voltage class. The front face carries an IP20 rating, so it's touch-safe inside an enclosure but not intended for washdown environments.
Mounting and integration
This relay mounts stand-alone on a vertical surface and can be rotated ±135° or tilted ±45° forward/backward, giving flexibility in tight panel layouts. The footprint is 45 mm wide, 87 mm high, and 78 mm deep — a standard S00 envelope that shares the same mounting hole pattern as the matching SIRIUS contactor (the 3RT10 series). Clearance requirements are minimal: 0 mm spacing upwards, forwards, backwards, and downwards, with only 6 mm needed at the side. This allows dense packing on a DIN rail or direct panel mount. Both the main current circuit and the auxiliary/control circuit use screw-type terminals. The main contacts accept solid conductors 1x (20...16 AWG), 1x (18...14 AWG), or 1x 12 AWG, and finely stranded with core end processing 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²).
Lifecycle and sourcing
The relay carries ATEX approval (DMT 98 ATEX G 001) for use in potentially explosive atmospheres, and the reference code per DIN EN 81346-2 is F, which aligns with standard protection function labeling in panel schematics.
What the ratings mean for fit
The Class 10 trip characteristic is the key selection parameter. It means the relay clears a locked-rotor condition before the motor winding insulation reaches its thermal limit, but it's not so fast that it trips on a normal start. If your motor's acceleration time exceeds 10 seconds at full voltage, you need a Class 20 or 30 relay instead.