Schneider Electric (Square D) LRD21 Overload Relay

The Schneider Electric Square D LRD21 Thermal Overload Relay is designed to provide reliable motor protection for three-phase motor control applications. Part of the TeSys Deca motor control range, this 12-18A overload relay features a Class 10A tripping characteristic and is engineered to help protect motors against overload conditions and phase failure. Designed for direct mounting with compatible TeSys D contactors including LC1D18, LC1D25, LC1D32, and LC1D38, the LRD21 offers a compact and efficient motor starter solution. Its adjustable current setting range allows precise matching to motor full-load current requirements, while the built-in 1NO + 1NC auxiliary contacts support control and signaling functions. With manual or automatic reset capability, ambient temperature compensation, and a rated insulation voltage up to 690V, this motor overload protection relay is widely used in industrial control panels, HVAC equipment, pumps, compressors, and other motor-driven systems.

Key Benefits

• Adjustable overload protection range from 12A to 18A
• Class 10A thermal trip characteristic for motor protection
• Provides overload and phase-loss protection
• Compatible with Schneider Electric TeSys D contactors
• Includes 1 normally open and 1 normally closed auxiliary contact
• Manual or automatic reset operation
• Ambient temperature compensated thermal sensing
• Suitable for industrial motor control and HVAC applications

Common Questions

What motors is the Schneider Electric LRD21 designed to protect?
The LRD21 is designed for motors with a full-load current setting between 12A and 18A and is commonly used with TeSys D contactors in motor starter assemblies.

Does the LRD21 provide phase-failure protection?
Yes. The relay features differential thermal sensing that helps protect motors from overload conditions and phase-loss situations that can cause overheating and damage.

Can this overload relay be mounted directly to a contactor?
Yes. The LRD21 is designed for direct mounting to compatible TeSys D contactors, creating a compact motor starter assembly.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.

LRD21 is the cross for 151194