Siemens SIRIUS 3RT1026-1XF40-0LA2 — 110 VDC Power Contactor, S0 Frame
The DC coil draws a pickup power of 0.7 per-unit initial value and a holding power of 1.25 per-unit full-scale value, meaning the coil's inrush is lower than its sealed consumption — a characteristic that simplifies DC supply sizing in 24 VDC or 110 VDC control circuits. Rated for AC-4 duty at 15.5 A at 400 V, this contactor handles the severe switching conditions of plugging and inching motor loads, not just steady-state running.
Panel Integration & Wiring
Main circuit terminals accept screw-type connections: solid conductors 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max. 2x (0.75...4 mm²). Auxiliary/control circuit terminals accept 2x (1...2.5 mm²) solid or stranded, max. 2x 10 mm². Side-by-side mounting is permitted, which saves rail space when grouping multiple contactors.
Switching Capacity & Motor Ratings
The main contact rated impulse withstand voltage is 6 kV, consistent with standard industrial isolation coordination. Motor horsepower ratings span from 2 hp at 110/120 V up to 20 hp at 575/600 V, covering common North American motor voltages. At 400 V the contactor switches 11 kW motors; at 690 V it also switches 11 kW. DC switching ratings are provided for the auxiliary contacts: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These matter when the contactor controls DC solenoids or indicator lamps in the same panel.
Compliance & Substance Restrictions
Standard Siemens SIRIUS documentation includes the declaration of conformity and the CE mark; specific UL or IEC certification files are available on request.