What this SIRIUS contactor is and where it fits
The Siemens 3RT1476-6SF36-3PA0 is a SIRIUS size S12 contactor with a 96-127 V AC/DC magnet coil terminated at screw-type terminals. It carries an auxiliary switch block (4-pole) and is designed for screw fixing to a mounting surface. The contactor is rated for a mechanical endurance of 10,000,000 operating cycles and an MTBF of 75 a, which indicates a design life well suited for continuous-process applications like conveyor lines, pump stations, or compressor skids where the contactor cycles regularly under load.
Key ratings and what they mean for fit
The S12 frame size accepts main-pole conductors from 70 mm² up to 240 mm² stranded, so this contactor is sized for higher-current motor or resistive loads — think 200+ A switching in AC-3 duty. The coil accepts both AC and DC control voltage across a 96-127 V range, which simplifies panel wiring when a mixed-voltage control circuit is in play. The auxiliary contacts are rated at 10 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, and 0.9 A at 125 V — these numbers govern what pilot devices or PLC inputs the aux block can drive directly without an interposing relay.
Mounting and integration notes
Mounting is by screw fixing through a single 11 mm hole. The contactor can be installed on a vertical surface and rotated ±90° or tilted ±22.5° forward/backward, which gives flexibility in tight enclosures. Keep the specified clearances: 10 mm upward, 10 mm downward, 10 mm at the sides, and 20 mm forward for arc-chamber venting. The operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Dimensions are 214 mm high, 160 mm wide, and 225 mm deep — verify gland-plate and door-swing clearance before cutting the backplate.