The Schneider Electric TeSys LG7D18Q721 is an enclosed direct-on-line (DOL) starter — a self-contained motor-starting package that combines a contactor, a circuit-breaker (motor-protective device), and control pushbuttons in a single polycarbonate enclosure rated IP55. It is designed for safety applications per IEC 60204-1 and IEC 60947-4-1, with a white start pushbutton, a black stop pushbutton, and a red mushroom-head emergency stop on the cover. The thermal protection adjustment range spans 17 to 23 A, and the AC-3 utilisation category means it is rated for switching three-phase induction motors: 4 kW at 220/230 V AC, 9 kW at 400/415 V AC, and 9 kW at 440 V AC (50/60 Hz). The control circuit runs on 380 V AC 50/60 Hz.
If you are open to a current-production alternative, check the FAQ for the official replacement.
Enclosure and installation notes
The polycarbonate enclosure measures 175 mm wide, 165 mm high, and 146 mm deep, with an IK07 impact rating. Cable entries include four knockouts: two Pg 13 and two Pg 16 on both top and bottom faces, giving flexibility for incoming and outgoing motor and control wiring.