Schneider Electric LR3D036 Thermal Overload Relay

LR3D036 is a three-pole TeSys LRD thermal overload relay used to protect 3‑phase motors in Schneider Electric motor-control cabinets. It features a non-differential, bi-metallic sensing element with a current setting range of 0.25 to 0.4 A and provides two auxiliary contacts: one normally open and one normally closed (1 Form A/1 Form B). The relay is designed with lug terminals, carries a class 10A rating, and is suitable for applications involving unbalanced loads when paired with a TeSys LRD contactor. Compact and lightweight, it measures about 66 mm wide by 45 mm deep by 70 mm tall and weighs roughly 124 g, enabling straightforward installation in standard control panels. Used as part of TeSys protection schemes, LR3D036 sits in the overload chain to sense motor current and trip when exceeded, protecting windings from overheating and reducing downtime. The LR3D036 is part of Schneider Electric’s TeSys LRD family and is commonly paired with TeSys LRD contactors to form complete motor-protection assemblies.