The Schneider Electric LC1K0901B7S335 is a TeSys K 3-pole contactor rated for AC-3 motor control up to 9 A at ≤440 V, with a 24 V AC coil and one normally closed auxiliary contact. It also carries an AC-1 resistive load rating of 20 A. The part is now obsolete per the manufacturer.
The AC-3 rating of 9 A at ≤440 V is the motor-switching current — sized for a 4 kW (approx 5.5 HP) three-phase induction motor at 400 V. The AC-1 rating of 20 A covers resistive loads like heaters. The 24 V AC coil draws from a control transformer; verify the control circuit can supply the inrush without droop. The 1 NC auxiliary is typically wired into a safety circuit or status feedback loop.
Panel builders should account for the 58 mm height when planning enclosure fill and clearance for coil wiring.