Active, Traceable Wye-Delta Starter for Motor Control
The Square D LC3D18AU7 is an active TeSys Deca wye-delta starter rated for AC-3 utilisation category, intended for motor control in industrial panels. Under change control via standard IEC 60947-1, it carries a pollution degree 3 rating and IP20 front face protection, making it suitable for environments where conductive dust or occasional condensation may occur. The power pole configuration is 3 x 3 NO, allowing insertion into wye-delta circuits without additional contact blocks for the main line and delta legs. Climatic withstand per IACS and protective treatment per IEC 60068-2-30 (TH) support storage and operation in non-conditioned enclosures.
Ambient operating temperature spans -40 to 70 °C at Uc, and storage range is -60 to 80 °C, covering most indoor North American panel conditions without derating. Mechanical robustness is specified: vibration 2 Gn open, 4 Gn closed at 5–300 Hz; shock 10 Gn open, 15 Gn closed at 11 ms. These figures support qualification for mounting on machinery or in transport environments where shock and vibration are documented.
Compliance and Material Traceability
Flame retardance is V1 per UL 94, and fire resistance is 1562 °F (850 °C) per IEC 60695-2-1. These ratings support the part’s use in panels requiring documented flammability performance for agency submittal. Pollution degree 3 assumes conductive pollution that could cause temporary conductivity from condensation; the IP20 front face prevents ingress of tools and large particles. For validation packages (IQ/OQ/PQ), the certification to IEC 60947-1 and the listed environmental withstand provide documented test conditions.