Siemens SIRIUS 3RT2035-3XF40-0LA2 — 110 V DC Power Contactor, Size S2
The Siemens SIRIUS 3RT2035-3XF40-0LA2 is a size S2 power contactor with a 110 V DC coil, spring-type terminals, and a rated operational current of 40 A at 480 V and 41 A at 600 V. The DC coil pulls 1.5 A inrush and picks up at 0.7 × rated voltage (77 V), dropping out at 1.25 × rated (137.5 V). Opening delay on DC is 30–55 ms; arcing time runs 10–20 ms. These numbers matter for sequencing logic — if your PLC output is rated for 24 V DC at 2 A, it will handle the coil inrush, but verify the holding current after pick-up. For AC-4 duty (plugging/reversing), the maximum switching rate is 300 operations per hour — useful for jogging or reversing conveyors where the contactor cycles frequently.
Mounting and Clearance — Panel Fit
Footprint is 55 mm wide × 114 mm high × 130 mm deep. Spring-type terminals accept 2 × (0.5–2.5 mm²) solid or stranded wire. No screw torque to verify — just strip and insert.
The part is in current lifecycle stage — no end-of-life notice, no successor announced.