What it is and what it does
The J7KNA0910400 is a 3-pole contactor from the J7KNA series, rated for 9 A AC switching current at up to 690 V AC, with a 400 V AC coil and a switching power of 4 kW. The 9 A AC-1 rating covers resistive loads; for motor duty (AC-3), the 7.5 HP rating gives a quick sizing reference for 3-phase induction motors. The 3NO main contact configuration and built-in 1NO auxiliary contact handle basic on/off and feedback without an add-on block.
Mounting and wiring
Mounts on DIN rail or with screws — the dual option covers both new panel builds and retrofit into existing enclosures where the rail is already full. Screw terminals accept solid or stranded wire; no special tooling needed for field wiring.