The LC3D120AB7 is a TeSys D star delta starter from Schneider Electric, designed for motor control applications. It features 3 x 3P (3 NO) power poles and is rated for AC-3 utilisation category, meaning it is suited for switching squirrel-cage induction motors during starting and stopping, where the inrush current can be several times the full-load current. The 12 A rating under AC-3 duty is the current the contactor can handle under those motor-start conditions, not a resistive-heating rating.
Environmental and Compliance Ratings
Pollution degree 3 indicates an industrial environment. IP20 front-face protection conforms to IEC 60529. Climatic withstand conforms to IACS and IEC 60947-1 Annex Q category D.
Coil and Operating Conditions
The coil is rated for 24 V AC. The ambient air temperature for operation spans -40 to 70 °C at Uc, and storage temperature from -60 to 80 °C. The protective treatment is TH conforming to IEC 60068-2-30, indicating damp-heat resistance. Mechanical robustness is specified for vibration (2 Gn contactor open, 4 Gn closed, 5–300 Hz) and shock (10 Gn open, 15 Gn closed at 11 ms).