Schneider Electric LR3D340 Thermal Iec Overload Relay

Product Description

The SCHNEIDER ELECTRIC LR3D340 is a thermal IEC overload relay rated for 30 to 40 amps at up to 690 volts AC. It provides motor overload protection by monitoring current draw and tripping the circuit when sustained overcurrent conditions are detected. Trip class is 10A, which defines the maximum trip time under overload conditions and is suited for standard motor starting applications. Licensed electricians and industrial maintenance technicians install this relay as part of a motor starter assembly in commercial and industrial control panels.

This relay is designed for use with IEC-style motor starter contactors, specifically the LC1D40A and LC1D65A contactors. It mounts directly to the contactor body, making it a compact and integrated solution for motor protection in three-phase applications. Typical installations include conveyor systems, pump motors, HVAC fan motors, and other industrial motor loads requiring reliable thermal overload protection up to 690 VAC.

Key Features

• Thermal sensing method detects sustained overcurrent conditions without electronic components
• Adjustable current range of 30 to 40 amps covers common motor FLA values in this class
• Trip Class 10A suits standard motor starting sequences
• Rated for up to 690 volts AC for compatibility with international voltage systems
• Direct-mount design integrates with LC1D40A and LC1D65A contactor bodies
• Compact footprint at 2.5 inches height, 4.3 inches width, and 5.4 inches length

Compatibility

Designed for direct use with SCHNEIDER ELECTRIC LC1D40A and LC1D65A IEC motor starter contactors as a thermal overload relay replacement or new installation component.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the NEC and applicable local electrical codes. De-energize and lock out the circuit before handling or mounting the relay. The LR3D340 mounts directly onto the compatible contactor body and should be secured fully before restoring power. Verify that the current adjustment dial is set to match the motor full-load amperage rating before commissioning.