The Schneider Electric TeSys LG7D18N721 is an enclosed direct-on-line (DOL) starter from the TeSys LG family, combining a contactor and a circuit breaker in a single IP55-rated polycarbonate enclosure rated IK07 for impact resistance. It is designed for safety applications per IEC 60947-4-1 and IEC 60204-1, with a thermal protection adjustment range of 17 to 23 A and a 415 V AC 50/60 Hz control coil. The unit includes a white push-button start, a black push-button stop, and a red mushroom-head emergency stop, with cable entries accommodating 2 Pg 13 and 2 Pg 16 glands on both top and bottom faces.
Motor power ratings and utilisation category
Rated for AC-3 utilisation category (switching squirrel-cage motors), the LG7D18N721 delivers 4 kW at 220/230 V AC, 9 kW at 400/415 V AC, and 9 kW at 440 V AC, all at 50/60 Hz. The AC-3 rating means this starter is sized for starting and stopping induction motors under load — the duty class that governs real motor-switching applications, not the higher AC-1 resistive rating.
Lifecycle status and sourcing reality
This part is classified as obsolete by the manufacturer. No official manufacturer successor is listed in the lifecycle record; any cross-reference must be validated against the specific enclosure dimensions, coil voltage, and thermal protection range.
The IP55 enclosure with IK07 impact resistance suits this starter for washdown environments, outdoor installations under cover, or areas where hose-directed water is present — common in food processing, packaging lines, and light industrial sites. Dimensions of 175 mm wide by 165 mm high by 146 mm deep allow panel or wall mounting with standard cable entries; the polycarbonate body provides corrosion resistance in humid or mildly aggressive atmospheres.