Schneider Electric LRD04 Thermal Iec Overload Relay

Product Description

The SCHNEIDER ELECTRIC LRD04 is a thermal IEC overload relay rated for 0.4 to 0.63 amps at up to 690 volts AC. It uses thermal sensing to detect sustained overcurrent conditions and trip the connected contactor before motor windings or downstream equipment sustain heat damage. Trip Class 10A defines the tripping time curve, making this relay suited for standard motor loads that require protection without nuisance tripping during normal inrush. Licensed electricians and industrial maintenance technicians are the primary installers of this device in motor starter assemblies and control panels.

This relay is designed for use in IEC-style motor starter assemblies, typically protecting three-phase motors in light-duty industrial and commercial applications. Its compact form factor and direct-mount design allow it to integrate cleanly into a starter block without additional wiring between the overload relay and contactor. Confirmed compatible contactors include the LC1D09 and LC1D38. It is appropriate for applications where motor current draw falls consistently in the 0.4 to 0.63 amp operating range.

Key Features

• Thermal sensing method provides reliable overcurrent detection for motor protection
• Adjustable current range of 0.4 to 0.63 amps covers light motor load applications
• Rated to 690 volts AC for compatibility with international and domestic supply voltages
• Trip Class 10A curve balances fast fault response with tolerance for motor starting inrush
• Direct-mount design mates with LC1D-series IEC contactors without external wiring
• Compact dimensions support installation in space-constrained control enclosures

Compatibility

Confirmed for use with the LC1D09 and LC1D38 IEC contactors. Verify current range and trip class against the motor nameplate and application requirements before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC Article 430 and any applicable local codes governing motor branch circuit and overload protection. De-energize and lock out the full panel before mounting or adjusting the relay. Set the current dial to match the motor full-load ampere rating shown on the motor nameplate after the relay is mechanically secured to the contactor. Do not bypass or jumper the overload relay contacts during commissioning testing.