What it is and what it does
The Siemens SIRIUS 3RT1055-6XF46-0LA2 is a size S6 contactor with a 110 V DC coil, designed for switching motor loads in industrial control panels. It includes an auxiliary switch and is secured via screw fixing to a vertical mounting surface, with ±90° rotatability and ±22.5° tilt front-to-back.
Key ratings and what they mean for fit
The 110 V DC coil pull-in and drop-out characteristics are defined by a rated value of 110 V and an initial value of 0.7, meaning the contactor will pick up reliably at 77 V DC and hold in down to that level. The arcing time is 10 to 15 ms, and the DC switching time is 80 to 90 ms — both figures matter when coordinating with upstream protection or sequencing multiple contactors in a motor control center. Mechanical life is rated at 10,000,000 operations typical, and the operating temperature range spans -40 to +70 °C, so it is suited for unconditioned enclosures or outdoor-rated panels within that band. Storage range extends from -55 to +80 °C. The contactor accepts solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²) maximum. This covers standard motor feeder and control wiring sizes without needing lug adapters.
Where it fits in the panel
Dimensions are 172 mm height, 120 mm width, and 170 mm depth. The depth is the critical dimension for enclosure depth selection — 170 mm means it will fit a 200 mm deep enclosure with clearance for wiring and arc chutes. Mounting clearance requirements: 10 mm upwards, 20 mm forwards, 10 mm downwards, and 10 mm at the side. A single 9 mm diameter hole is specified for fastening.