The Siemens SIRIUS 3RU1136-1KD0 is a thermal overload relay in the S2 frame size, Trip Class 10, designed for motor protection in industrial control panels. It mounts directly to a contactor (contactor mounting) and provides adjustable overload protection with a manual/auto reset option. Rated for a 24 V control circuit drawing 1 A, the relay also handles auxiliary switching at 120 V 3 A and 230 V 2 A. The main circuit uses screw-type terminals accepting 2x (0.5...2.5 mm²) solid or 2x (0.75...25 mm²) stranded; the auxiliary and control circuit uses Cage Clamp terminals for 2x (0.5...1.5 mm²) finely stranded with ferrule. With IP20 protection on the front, it's suited for enclosed panel mounting where incidental finger contact is the only exposure. The mounting position allows a vertical surface with ±135° rotation and ±45° tilt front/back, giving flexibility in crowded cabinets.
Key Ratings & What They Mean
Trip Class 10 means the relay will trip within 10 seconds at 7.2× the set current — standard for protecting standard induction motors during start-up without nuisance tripping on normal acceleration. Surge voltage resistance rated at 6 kV ensures the relay withstands transient overvoltages common in industrial environments, reducing the risk of insulation breakdown on the control circuit. Shock resistance of 8g / 10 ms confirms it can handle vibration and mechanical shock typical on conveyor drives and pump skids without false trips.
Integration & Mounting
Mounts directly onto a contactor — no separate bracket needed. The S2 frame size is the standard footprint for this current range. Clearance: 0 mm upwards, forwards, backwards, and downwards; 6 mm at the side — tight stacking is possible in a DIN-rail panel. Main circuit screw terminals accept AWG 2x (18...3) solid or 1x (18...1). Auxiliary Cage Clamp terminals accept AWG 2x (20...14). Strip length for the Cage Clamp is not stated but standard for the terminal type is 8–10 mm.
Compliance & Approvals
Carries ATEX protection type DMT 98 ATEX G 001 for use in potentially explosive gas atmospheres. Reference code per IEC 81346-2 is F. Substance prohibitance date 07/01/2006 aligns with RoHS compliance scope. Operating temperature range -20 to +70 °C; storage and transport -55 to +80 °C. Relative humidity during operation up to 100 % — suitable for high-humidity environments like washdown areas.