S6 Frame, 96-127 VAC Coil — What the Ratings Mean for Fit
The 3RT1054-6PF35 is a Siemens SIRIUS power contactor in frame size S6, meaning it occupies the physical envelope and terminal footprint of that size class — 172 mm tall, 140 mm wide, 170 mm deep. The coil is rated 96-127 VAC at 50/60 Hz, with a pickup threshold of 0.8 × rated value and a dropout of 0.6 × rated value, so it will hold in on a nominal 110 VAC control circuit but may drop out if the line sags below about 77 VAC. The main power terminals accept stranded cable from 25 mm² up to 120 mm² — that is the range for the load-side wiring. The coil and auxiliary terminals are screw-type, accepting solid or stranded wire: 2× (0.5-1.5 mm²), 2× (0.75-2.5 mm²), or max 2× (0.75-4 mm²). This is a contactor you land with a screwdriver, not a spring-cage tool.
Switching Duty and Mechanical Life
The contactor is rated for different switching frequencies depending on the utilization category: 1 000 operations per hour at AC-3 (motor starting), 800 at AC-1 (resistive), 400 at AC-2 (slip-ring motors), and 130 at AC-4 (plugging/inching). The AC-3e rating also sits at 1 000 ops/h. The mechanical life is 10 million operations typical — that is the contactor body itself, not the contacts under load. Arcing time is 10-15 ms, and the operate time (both AC and DC coil) is 80-90 ms. That gives you a total break time around 90-105 ms from coil de-energization to arc extinction — relevant for coordinating with upstream protection.
Mounting and Clearance Requirements
Mounting is by screw fixing (four 9 mm holes) on a vertical surface. The contactor can be rotated ±90° or tilted ±22.5° front-to-back. Minimum clearances to adjacent parts: 10 mm upwards, 10 mm downwards, 10 mm at the side, and 20 mm forwards. That 20 mm forward clearance is the arc-chute side — respect it to avoid flashover between phases. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The full-scale value of 1.1 means the contactor can be operated at 110% of rated voltage continuously — but check the coil thermal limit if the ambient is at the high end.
Auxiliary Contacts and Coil Options
The contactor is equipped with an auxiliary switch block. The auxiliary contact ratings are: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V — all at the rated value. These are the dry switching limits; derate for inductive loads. The coil termination is screw-type, and the coil itself is rated for continuous duty at 96-127 VAC. The initial pickup value is 0.8 × rated, so at 96 V nominal the pickup threshold is about 77 V.