What It Is and What It Does
The Siemens SIRIUS 3RT2017-2LB42-1LA0 is a Size S00 power contactor with a 24 V DC coil, designed for switching motor loads and resistive loads in industrial control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct fit for standard panel layouts. The coil draws 10 A at its 24 V DC rated value, and the contactor is rated for auxiliary switching with an integrated auxiliary switch. The spring-type terminals on the coil side accept solid conductors from 0.5 to 4 mm², reducing wiring time compared to screw terminals.
Key Ratings and What They Mean for Fit
The 24 V DC coil is the primary control voltage — if your PLC or control relay outputs 24 V DC, this contactor picks up directly without an interposing relay. The 10 A rating at 24 V DC is the coil inrush current, not the main contact rating; the main contacts are rated for motor duty (AC-3) and resistive loads (AC-1), though specific AC-3/AC-1 current values are not listed in this spec set. The operating temperature range of -40 to +70 °C covers most indoor panel environments, including unheated enclosures in cold climates. The Size S00 footprint (45 mm wide, 70 mm high, 121 mm deep) is the smallest SIRIUS contactor frame, suited for compact panels where space is tight. The 121 mm depth includes the coil terminals; allow at least 10 mm clearance above and below for air circulation and arc quenching.
Mounting and Integration
Snap-on mounting onto 35 mm DIN rail per DIN EN 60715 is the standard method; screw mounting is also possible. The contactor can be installed in any position, but the preferred orientation is standing on a horizontal mounting surface. Maintain 6 mm clearance at the sides and 10 mm above/below for arc flash and heat dissipation. Spring-type terminals on the coil side accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid conductors. For stranded wire, the range is 2x (0.5 to 4 mm²). This covers common control wiring sizes without needing ferrules, though ferrules are recommended for stranded in high-vibration environments.