Schneider Electric LR3D10 Thermal Iec Overload Relay

Product Description

The SCHNEIDER ELECTRIC LR3D10 is a thermal IEC overload relay rated for 4 to 6 amps at up to 690 VAC. It provides motor protection by detecting sustained overcurrent conditions and tripping the connected contactor before heat damage occurs. The relay uses a thermal sensing method and is rated Trip Class 10A, meaning it trips within 10 seconds at 7.2 times the set current. Electricians and industrial controls technicians install this device as part of a motor starter assembly in control panels, machine enclosures, and industrial distribution equipment. Its compact form factor makes it suitable for tight panel layouts.

The LR3D10 is designed for use in motor protection circuits in both light industrial and commercial applications. It pairs directly with LC1D09 through LC1D38 series contactors to form a complete IEC motor starter. Typical installation scenarios include conveyor drives, pump starters, fan motors, and other three-phase motor loads requiring reliable overload protection. The adjustable current range of 4 to 6 amps makes it appropriate for smaller fractional to low-horsepower motor applications operating on standard IEC voltage systems up to 690 VAC.

Key Features

• Thermal sensing method detects sustained overcurrent for reliable motor protection
• Adjustable current range from 4 to 6 amps to match motor full-load amperage
• 690 VAC maximum voltage rating supports a wide range of IEC power systems
• Trip Class 10A for fast response to overload conditions
• Direct-mount compatibility with LC1D09 and LC1D38 contactors
• Compact dimensions fit standard IEC motor starter assemblies

Compatibility

Designed for direct use with LC1D09 and LC1D38 series contactors as stated by the manufacturer. Suitable for IEC-style motor starter configurations in industrial and commercial control panel applications.

Installation Notes

Installation should be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Disconnect and lock out all power to the panel or motor starter assembly before mounting or wiring the relay. The relay mounts directly to the compatible contactor without additional hardware. Set the overload dial to match the motor nameplate full-load amperage before energizing the circuit.