The Siemens 3RT2017-2KA42 is a SIRIUS coupling contactor in the compact Size S00 frame, designed for switching DC loads in control circuits and small motor applications. Its 24 VDC coil with spring-type terminals simplifies panel wiring — no screw torque checks, just strip and push. Rated 10 A at 24 VDC, it handles the common DC control voltages found in PLC output circuits and relay logic panels. The contactor also carries a 2 hp motor rating at 230 V, extending its use to small single-phase motor loads like fans or pumps.
DC switching capability and arcing behaviour
DC switching is harder on contacts than AC because there is no natural zero-crossing to extinguish the arc. Use the 24 V rating as the baseline for control-circuit loads; the higher-voltage figures are for low-current signal switching only. The main contact rating range is listed as 20 to 12 — interpret this as the thermal continuous current range in amps for the main poles, consistent with the S00 frame's typical 12-20 A envelope. For motor duty, the AC-3 switching frequency maximum is 750 operations per hour, adequate for most conveyor and pump cycling.
Mounting, clearances, and environmental limits
Mechanical endurance is 30 million operations typical — this is the contactor's service life before mechanical wear, not the electrical life under load, which depends on the switched current and duty cycle.
Wiring and conductor compatibility
No ferrule needed for solid wire — the spring clamp grips the bare copper. This matches the standard panel wire sizes for control circuits (1.5 mm² or 2.5 mm² typical).
Sourced to order against your BOM quantity through independent distribution channels. The paperwork trail includes the manufacturer's declaration of conformity for CE/UKCA marking where applicable.