Schneider Electric LR3D12 Thermal Iec Overload Relay

Product Description

The SCHNEIDER ELECTRIC LR3D12 is a thermal IEC overload relay rated for 5.5 to 8 amps and 690 volts AC. It uses bimetallic thermal sensing to monitor motor current and trip the connected contactor when sustained overcurrent conditions are detected, protecting motors from overload damage. Classified as Trip Class 10A, it delivers a fast response suitable for standard motor applications. Licensed electricians and industrial maintenance technicians install this relay as part of a motor starter assembly. The compact housing measures 3.5 inches in length, 3 inches in width, and 1.9 inches in height and weighs 0.32 pounds.

The LR3D12 is suited for use in industrial motor control applications where IEC-standard overload protection is required. It mounts directly to compatible IEC contactors — specifically the LC1D09 through LC1D38 contactor series — making it a common choice in motor starter assemblies for pumps, fans, compressors, and conveyor drives in commercial and industrial environments. Its thermal sensing method provides reliable, automatic trip protection under sustained overload conditions without requiring additional sensing modules.

Key Features

• Thermal sensing method provides reliable overload detection without electronic components
• 5.5 to 8 amp adjustable current range covers common fractional and small integral horsepower motors
• 690 VAC rating supports both North American and international voltage systems
• Trip Class 10A response time suits standard motor starting and running characteristics
• Direct-mount design integrates with LC1D09 through LC1D38 IEC contactors for a compact starter assembly

Compatibility

Designed for direct use with LC1D09 and LC1D38 series IEC contactors as part of a motor starter assembly.

Installation Notes

Installation should be performed by a qualified electrician in accordance with NEC requirements and applicable local codes. Disconnect and lock out all power to the control panel before mounting or wiring the relay. Set the current adjustment dial to match the full-load amperage of the motor being protected before energizing the circuit. Do not bypass the overload relay or use it outside its rated current and voltage range.