Schneider Electric (Square D) LR3D21L Thermal Overload Relay 12–18A Class 20

The Schneider Electric (Square D) LR3D21L Overload Relay operates as an HVAC system protection part that safeguards motors against overheating and damage caused by excessive current flow. This protects motors by maintaining operation within 12A to 18A current range while operating at Trip Class 20. The relay operates through detecting high currents then automatically disconnecting the circuit to stop motor. The relay system provides efficient operation with minimal downtime while providing high-quality protection overall in commercial and industrial HVAC systems.