Siemens 3RT1035-3AR60 — SIRIUS Size S2 Power Contactor
The Siemens 3RT1035-3AR60 is a SIRIUS-brand power contactor in frame size S2, rated for motor switching up to 22 kW at 500 V in AC-3 duty. That 22 kW figure at 500 V tells you this contactor handles a 30 HP-ish motor on a 480 V line — the typical sweet spot for medium conveyor drives, pump starters, and compressor duty in North American and European panels. The AC-3 rating is the one that matters for squirrel-cage motor starts; the AC-1 resistive rating (not listed here) would be higher, but for inductive loads this is the number that governs contact life. It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 50022. Side-by-side mounting is permitted, so you can gang multiple contactors in a motor control center without derating for heat buildup — but watch the ambient: operating range is -25 to +60 °C, and pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation. The front face carries IP20, so finger-safe above the panel; the terminal area is IP00, meaning bare live parts at the connection point — standard for this class, but plan for a finger-duct cover or shrouded terminals if the panel is open during maintenance.
Switching Performance and Mechanical Life
Mechanical life is typical 10,000,000 operations — that's the no-load endurance. Under load, the electrical life depends on the duty cycle: AC-3 max switching rate is 1,000 operations per hour, AC-2 max 600 ops/h, AC-4 max 300 ops/h. For a conveyor that cycles once every 30 seconds, AC-3 at 1,000 ops/h gives you headroom; for a jogging application (AC-4), the 300 ops/h limit means you'll need to derate or accept shorter contact life. Arcing time is 10–15 ms, and the AC switching time (coil pickup to main contacts closed) is 7–20 ms — fast enough for most PLC-controlled sequences, but not for high-speed synchronous transfer.
Termination and Wiring
Main current circuit uses screw-type terminals. Solid wire: 2x (0.25 – 2.5 mm²). Stranded: 2x (0.75 – 25 mm²). Combined solid or stranded: 2x (0.75 – 16 mm²).
Dimensions and Panel Fit
Physical footprint: width 55 mm, height 112 mm, depth 115 mm.
Coil and Auxiliary Ratings
The contactor carries auxiliary contact ratings at various voltages: 24 V rated value 10 A, 60 V rated value 2 A, 110 V rated value 1 A, 220 V rated value 0.3 A, 230 V rated value 6 A, 400 V rated value 3 A. These are the make/break capacities for the auxiliary contacts — not the main power path. The 10 A at 24 V is useful for pilot duty on a 24 VDC PLC output; the 6 A at 230 V covers a typical control transformer secondary. The 0.3 A at 220 V is low — that's the DC-13 rating for a 220 VDC inductive load, which is a tough switch for any contactor.