What This Part Is and What It Does
The Siemens SIRIUS 3RT2016-1CK27-ZX95 is a size S00 power contactor rated for AC-3 switching at up to 750 operating cycles per hour — the duty class that governs motor starting under full load. The 45 mm wide body mounts on a 35 mm DIN rail per DIN EN 60715, with screw-type terminals on the magnet coil for panel wiring. The AC-3 maximum of 750 1/h means it can switch a motor load on and off every 4.8 seconds without exceeding thermal limits; the AC-4 maximum of 250 1/h is the limit for plugging or inching duty, where the contactor makes and breaks stalled rotor current.
Clearance and Mounting Constraints
The contactor requires 10 mm clearance upwards, downwards, and forwards, and 6 mm at the side for heat dissipation and arc containment. The arcing time falls between 10 and 15 ms at AC, which means the contactor clears a fault fast enough to coordinate with typical upstream motor-protective breakers. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits in tight enclosures as long as the 117 mm depth is accounted for.
Wire Termination and Terminal Capacity
The main circuit terminals accept solid or stranded wire from 0.5 to 4 mm², and can take two conductors per terminal: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². This makes daisy-chaining or looping through the contactor straightforward without needing extra terminal blocks. The coil connection uses screw-type terminals — no spring cages here, so a screwdriver and the correct torque are needed for termination.
Rated Operational Currents Across Voltages
The contactor's auxiliary contacts (main contacts used for control) are rated at 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.2 A at 440 V. At 230 V the rating is 1 hp, which is the standard North American horsepower rating for a small motor. At 400 V the rating is 3 A — useful to know if you are switching a control transformer or small three-phase motor directly.
Environmental and Mechanical Ratings
Operating temperature range is -25 to +60 °C, and storage range is -55 to +80 °C, so it handles both cold warehouses and warm enclosures. The mechanical life is typically 10 million operations — far beyond the electrical life under load, which is governed by the switching frequency and duty class. No auxiliary switch is integrated into this variant, so any feedback or status indication must come from an external auxiliary contact block.