What the ratings mean for fit
The Siemens SIRIUS 3RT2037-1AG60 is a Size S2 power contactor rated for 65 A at 480 V — that's the AC-3 motor-switching current, so it handles a 65 A induction motor load at that voltage without welding the main contacts. The coil is screw-type terminals, which means the control wiring lands under a screw clamp, not a spring cage; factor that into your panel wiring labor. It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward — useful when you're squeezing it into a tight enclosure.
Mounting and panel integration
Snap it onto a 35 mm DIN rail or screw-mount directly. Clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side — that's the minimum air gap around the contactor for arc extinguishing and cooling. The depth is 130 mm, width 55 mm, height 114 mm, so it fits a standard 55 mm-wide DIN-rail slot. Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C.
Switching performance and auxiliary contacts
Arcing time is 10 to 20 ms, and the contactor's mechanical service life is 10 million operations typical. It comes with an auxiliary switch (1 NO + 1 NC configuration for the main contacts). Maximum switching rates vary by duty: 800 operations/hour at AC-1 (resistive), 700 at AC-3 (motor), 400 at AC-2 (slip-ring motor), and 200 at AC-4 (plugging/inching). The coil operates at 100 V, 50 Hz with a power factor of 0.36; at 60 Hz it draws 0.39 A.