Square D LR9D TeSys LRD Electronic Overload Relay

Square D LR9D TeSys LRD Electronic Overload Relay

The Square D LR9D TeSys LRD electronic overload relay delivers precise thermal protection for 3-phase motors rated 0.75-3kW@400V, and this listing covers the family's Motor FLA options of 1.6A and 6.4A within an overall thermal setting range of 1.6-8A. Selectable tripping class 5-10-20-30 lets panel builders match the trip curve to the connected motor's start-up profile. Rated 690V power circuit / 660V signalling circuit, this differential-design relay detects phase failure and load unbalance while withstanding a 6kV impulse and 2kV surge, making it a reliable choice for demanding industrial and commercial motor control applications. Its IP20 front-face rating (IEC 60529) and compact under-contactor mounting simplify integration into new or retrofit control panels.

Key Features

• Motor FLA Options: available in 1.6A and 6.4A ratings within a 1.6-8A adjustable thermal setting range for 3-phase motors from 0.75-3kW@400V.
• Selectable Tripping Class: Class 5-10-20-30 provides flexible protection curves for varying motor start-up profiles.
• Electronic Thermal Protection: Differential device design adds phase failure and load unbalance detection beyond standard thermal overload.
• Surge & Impulse Withstand: Rated to withstand 6kV impulse and 2kV common-mode surge (IEC 61000-4-5) for durability in harsh electrical environments.
• Rated Operational Voltage: 660V signalling circuit and 690V power circuit for broad system compatibility.
• Rated Insulation Voltage: 690V signalling circuit and 1000V power circuit for added dielectric margin.
• IP20 Degree of Protection: Front-face IP20 rating per IEC 60529 shields internal components from incidental contact.
• Flexible Mounting: Installs under contactor, on a plate, or on rail with specific accessories to fit existing panel layouts.

Certifications & Compliance

• UL Listed
• CSA Certified
• IECEE CB Scheme
• CCC Certified
• Compliant with EN/IEC 60947-4-1 and EN/IEC 60947-5-1
• Compliant with UL 60947-4-1 and UL 60947-5-1
• Compliant with CSA C22.2 No 60947-4-1 and No 60947-5-1
• Compliant with GB/T 14048.4 and GB/T 14048.5
• RoHS EUR Compliant with Exemptions

Technical Specifications

• Amperage Rating: 1.6A-8A
• Mercury Free: Yes
• Device Type: Relay, Control & Measurement - Protection relay
• Relay Application: motor protection
• ROHS Exemption Information: Yes
• Country of Origin: CHN

Typical Applications

• 3-Phase Motor Protection Circuits
• Industrial and Commercial Electrical Control Panels
• Contactor-Mounted Motor Control Assemblies
• Motor Control Centers
• Panelboard and Control Circuit Wiring

Why Square D?

Square D LR9D TeSys LRD relays combine electronic thermal accuracy with differential phase-failure and load-unbalance detection, giving panel builders and electricians a dependable safeguard for 3-phase motor circuits across the 1.6A and 6.4A Motor FLA options. Backed by UL, CSA, and IECEE CB Scheme certification and rated to withstand 6kV impulse and 2kV surge conditions, this relay is built for code-compliant, long-service performance in industrial and commercial installations.