Schneider Electric LRD1521 Thermal Overload Relay

Schneider Electric TeSys Deca LRD1521 is a thermal overload relay that protects three‑phase motors by sensing current and tripping when the load exceeds the set point, rated for 12–18 A with a Class 20 operating characteristic and designed for use with TeSys D contactor assemblies to create coordinated motor protection. It provides a 1 normally open plus 1 normally closed signaling contact (1NO+1NC) for fault feedback to control logic or automation systems, enabling straightforward interlocking and status monitoring. The relay is built for up to 690 V AC operation per IEC 60947-4-1, with a UL rating around 600 V, and features a thermal setting range of 12–18 A so you can tailor protection to the motor while keeping in sync with companion TeSys D devices such as LC1D25 and LC1D32 in typical configurations. Typical applications include protection of industrial motors in conveyors, pumps, fans, and processing equipment, where reliable overload protection reduces downtime and simplifies wiring by pairing the relay with the TeSys Deca family.