The Schneider TeSys LG7D18P721 is an enclosed direct-on-line (DOL) starter that combines a contactor and circuit-breaker in one IP55 polycarbonate enclosure. It's rated for AC-3 motor switching: 4 kW at 230 V AC and 9 kW at 400/415 V AC, 50/60 Hz. The thermal protection adjustment range is 17...23 A, and the control circuit runs on 230 V AC 50/60 Hz. This is a safety-rated device per IEC 60204-1 and IEC 60947-4-1, suited for guarding motor circuits in standard industrial environments.
The AC-3 utilisation category tells you this starter is built for starting squirrel-cage motors and disconnecting them while running — that's the standard duty for a DOL starter. The 17...23 A thermal protection range covers motors in that full-load current band; you set the dial to match the motor nameplate. The 230 V AC coil means the control voltage is line-powered, not low-voltage DC — common in older panels or where a separate control transformer isn't used. IP55 and IK07 mean the enclosure handles hose-down cleaning and low-energy impacts, so it's fine for washdown areas or exposed machine mounting.
Enclosure and integration details
The polycarbonate enclosure measures 175 mm wide, 165 mm high, and 146 mm deep. It has four cable entries: two Pg 13 and two Pg 16 at the top, and the same at the bottom. The push-button controls are integrated: white start, black stop, and a red mushroom-head emergency stop. This is a self-contained unit — mount it on a wall or machine frame, run the motor cable and control wiring through the glands, and you're done. No separate contactor and overload to wire up in a panel.