The Siemens SIRIUS 3RT1456-6SF36-3PA0 is a size S6 contactor with a 96-127 V AC/DC magnet coil terminated via screw-type terminals. The coil pulls in at 0.8 of rated value and holds across the full AC/DC range, so it's a straight swap into panels with 110 V control transformers or 125 V DC buses — no coil-voltage conversion needed.
What the ratings mean for fit
The MTBF of 75 a means this contactor is spec'd for a 75-year mean time between failures under standard operating conditions — that's a reliability figure you'd expect on a motor-starting duty cycle in a controlled environment, not a guaranteed service life, but it tells you the design margin is there for continuous industrial use. Power-terminal capacity accepts 25 to 120 mm² stranded copper, so it handles the full range of motor feeder cables for a size S6 contactor — from a 35 mm² tail on a 55 kW motor up to a 120 mm² on a 90 kW. The auxiliary switch block is attachable (up to 4 units), and the screw-type coil terminals accept 0.5 to 4 mm² solid or stranded, which is standard for control wiring. Mounting is screw fixing on a vertical surface, rotatable ±90° and tiltable ±22.5° front-to-back, so it fits enclosures where the backplate isn't perfectly plumb or where you need to angle the contactor to clear a busbar. Clearances: 10 mm upward, 10 mm downward, 20 mm forward, 10 mm at the side — that's tight enough for a dense panel but leaves room for the arc chute (arcing time 10-15 ms). Operating temperature range -25 to +60 °C covers most indoor industrial panels; storage range -55 to +80 °C means it can sit in an unheated warehouse or shipping container without damage. The coil pickup and dropout times (115-130 ms AC or DC) are symmetrical, so timing in a safety circuit or sequential start-up is predictable regardless of control supply type.