S3 Frame Contactor for Motor and Resistive Loads
The 3RT2046-3XB44-0LA2: Rated for AC-4 maximum switching frequency of 250 operations per hour — this is the plugging/reversing duty limit; for standard AC-3 motor starting the mechanical endurance of 10,000,000 typical cycles is the practical ceiling.
Coil Drive and Auxiliary Contact Provisions
The 24 VDC coil has a pick-up voltage tolerance with an initial value of 0.7 (70% of rated) and a full-scale value of 1.25 (125%) — the drop-out threshold is around 0.7× rated, so a sagging 24 V bus below ~16.8 V will cause the contactor to drop out and interrupt the load circuit. Arcing time is 10... 20 ms, and the DC switching times are 38... 57 ms — the arcing duration matters for coordination with upstream short-circuit protection devices; a 20 ms arc at 480 V can sustain enough energy to trip a fast semiconductor fuse if the contactor is the sole disconnecting means.
Environmental and Compliance Range
The contactor is part of the SIRIUS product brand, which carries IEC/EN 60947-4-1 compliance for contactors and motor starters — documentation for RoHS, REACH, and UL listing is available through the standard Siemens documentation portal; the order code suffix 0LA2 indicates a specific variant with the spring-type coil terminals.