The J7KN18D1024 is a 3-pole power contactor rated for 18 A switching current and 7.5 kW at 400 V AC — sized for a 15 HP motor load on a 400 V three-phase line. The 24 V AC coil keeps the control circuit isolated from the power side, standard for panel builders wiring through a PLC or relay output. Screw terminals accept up to 4 mm² stranded conductors; torque to 1.2 Nm per the manufacturer's spec.
Integration Notes
The 3NO main contacts handle the motor circuit; the integrated 1NO auxiliary contact provides feedback to the PLC or status lamp without an add-on block. Wire the coil from a 24 V AC control transformer — verify the transformer VA rating covers the inrush (typically 7–8 VA for this size). Screw terminals are standard for panel wiring; no special crimp tool needed beyond a screwdriver. If derating for ambient above 40 °C, reduce the 18 A continuous rating by 20% per the manufacturer's thermal curve.