Siemens 3RT2037-1AV60 — SIRIUS Size S2 Power Contactor
Its headline rating is 65 A at 480 V 60 Hz under AC-3 duty — the standard category for squirrel-cage motor starting, so it handles the locked-rotor inrush and breaks the running current for motors up to that frame size. The 24 V 60 Hz coil draws 0.37 A holding power at 60 Hz, which keeps the control transformer sizing straightforward.
The AC-3 rating of 65 A at 480 V is the number that governs motor switching — it means the contactor can make and break the motor's running current under full load. For resistive loads (AC-1), the maximum operating frequency is 800 switching cycles per hour, while AC-3 allows 700 cycles per hour. AC-4 (plugging/inching) drops to 200 cycles per hour, reflecting the higher electrical stress of reversing duty. The built-in auxiliary switch provides 1 normally open and 1 normally closed contact (18...1 configuration). Those aux contacts carry rated currents from 10 A at 24 V down to 0.3 A at 220 V — useful for status feedback to a PLC or for interlocking in a reversing starter. The screw-type coil terminals accept 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) solid or stranded wire.
Dimensions and Panel Clearance
The contactor measures 114 mm high, 55 mm wide, and 130 mm deep. The arcing time is 10...20 ms, and the closing time is 10...18 ms — both within the normal range for this frame class.
The lifecycle status is current production, so this is an active catalog item — not a phase-out or NRND part.