The Schneider Electric LRD08S207 is a TeSys Deca differential thermal overload relay for motor protection, with a thermal protection adjustment range of 2.5 to 4 A and a class 10A tripping curve per IEC 60947-4-1. It provides phase failure sensitivity, tripping at 130% of Ir on two phases when the third is at zero, per IEC 60947-4-1, which means it catches single-phasing conditions that can burn out a motor winding. The relay mounts under a contactor or on a plate or rail with specific accessories, and its IP20 finger-safe enclosure suits installation inside a control cabinet.
Sourcing reality — obsolete, sourced to order
No official direct replacement is listed in the lifecycle record.
The 2.5 to 4 A adjustment range sets the motor full-load current (FLC) window; set the dial to match the motor nameplate FLC for proper thermal protection. Auxiliary contact composition is 1 NO + 1 NC, providing one normally-open and one normally-closed signal path for the control circuit — enough to wire a trip alarm and a reset interlock. The signalling circuit is rated for 3 A at 120 V AC-15 (inductive), 1.5 A at 240 V AC-15, and 0.1 A at 250 V DC-13 — these are the contact ratings for the auxiliary contacts under different load types, so verify your control voltage and load type against these curves. Rated insulation voltage (Ui) is 690 V per IEC 60947-4-1 and 600 V per UL/CSA, so the relay is suitable for 480 V and 600 V motor circuits in North American and IEC panels. Dielectric strength is 1.89 kV at 50 Hz per IEC 60947-1, confirming basic insulation coordination for 690 V systems.