The LRD3363A66 is a differential thermal overload relay from the TeSys Deca range, designed for motor protection in three-phase AC circuits up to 1000 V. The adjustment range covers 63 to 80 A, set via the front dial. The relay offers phase-failure sensitivity: it trips at 130% of the set current on two phases when the third drops to zero, protecting the motor against single-phasing. Auxiliary contacts are 1 NO + 1 NC, rated at 5 A thermal (Ith) for the signalling circuit.
Certified to EN/IEC 60947-4-1 and -5-1, UL 60947-4-1 and -5-1, CSA C22.2 No 60947-4-1 and -5-1, and GB/T 14048.4 and.5. Rated insulation voltage (Ui) is 1000 V per IEC, 600 V per UL/CSA. Impulse withstand (Uimp) is 6 kV. Dielectric strength tested at 2.2 kV at 50 Hz. Flame retardance V1 per UL 94.