What the 45 A rating means for fit
The 100-250 VAC/VDC coil gives you flexibility across control voltages — same part works for a 120 V or 240 V control circuit, AC or DC. The 4-pole configuration (2 N.O. + 2 N.C. main contacts) suits applications needing both make and break on the same device, like reversing or two-speed motor starters where you need to disconnect one winding before engaging another.
This AF26 frame contactor snaps onto a DIN rail — standard 35 mm. The 100-250 V coil range means you don't need a separate control transformer if your panel runs at 240 VAC. Note the description states this unit does not include standard auxiliary contacts, so if you need feedback to a PLC or status indication, order the aux contact block separately. The 600 V rated insulation gives headroom for 480 V systems without derating.