What this contactor is and where it fits
The Siemens SIRIUS 3RT1054-6SF36 is a size S6 power contactor with a 96-127 VAC magnet coil terminated to screw-type terminals. It is designed for switching motor loads in industrial control panels where a 50/60 Hz coil supply is available. The contactor is rated for AC-3 switching at up to 750 operations per hour, which covers the majority of standard motor start/stop cycles on conveyors, pumps, and fans. The AC-4 rating of 130 ops/h applies to plugging or inching duty where the motor is reversed or jogged under load. The coil draws a holding power that keeps dropout below 18 VAC, and the 115-130 ms closing time is consistent across both AC and DC operation — meaning it can be wired into a DC-switched control circuit without retiming the sequence.
Sourcing and lifecycle posture
The listed MTBF of 75 a reflects a design that is mature and field-proven. This figure is typical for a SIRIUS S6 contactor in a controlled electrical environment and supports a long maintenance interval in continuous-duty applications.
Panel integration and mechanical fit
The contactor measures 172 mm high, 120 mm wide, and 170 mm deep. Mounting is via screw fixing through a single 9 mm hole; the mounting position allows ±90° rotation and ±22.5° tilt on a vertical surface, which gives flexibility in tight enclosures. Clearance requirements: 10 mm above and below, 20 mm forward, and 10 mm at the sides. The main power circuit accepts stranded cable from 25 to 120 mm², while the control terminals take solid or stranded wire up to 4 mm² per clamp. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. The auxiliary switch is included, so no separate add-on block is required for basic status feedback.