Square D LR9D TeSys LRD Electr...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$194.24
Square D LR9D TeSys LRD Electronic Overload Relay

Square D LR9D TeSys LRD Electronic Overload Relay

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Model: LR9D08

In Stock (leaves warehouse same day if ordered before 3pm ET)

$194.24
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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.

Manufacturer Resources

Product Specs

Product Type:
Overload Relay
Series:
TeSys LRD
Voltage Rating:
690V
Amperage Rating:
1.6A-8A
Listing:
UL Listed
Standards:
IEC 60947-4-1
Department:
Electrical
Product Group:
Motor Control & Automation
Product Subgroup:
Overload Relays

Square D LR9D08 – Frequently Asked Questions

1) What motor sizes will the Square D LR9D overload relay protect?
The LR9D TeSys LRD electronic overload relay covers 3-phase motors from 0.75 to 3 kW at 400 V, with an adjustable thermal setting range of 1.6 to 8 A. Two Motor FLA build-outs are offered: LR9D08 at 1.6 A and LR9D32 at 6.4 A. Set the dial to the motor nameplate FLA inside that range.
2) Can an LR9D relay be used on a 600V motor control circuit?
Yes. The power circuit is rated 690 V operational with 1000 V rated insulation, and the signalling circuit is 660 V operational / 690 V insulation, so a 600 V three-phase system is within rating.
3) What is the difference between trip class 10 and class 20, and which should I set on an LR9D?
Trip class is how long the relay tolerates locked-rotor current before tripping, so it has to match the motor's start profile. The LR9D is selectable across class 5, 10, 20 and 30. Class 10 suits ordinary direct-on-line loads like pumps and fans; class 20 or 30 is for high-inertia starts such as loaded conveyors, crushers or large fan wheels that pull starting current for longer. Class 5 is for motors needing fast protection.
4) Will a thermal overload relay detect a lost phase, or do I need something electronic?
A standard bimetallic thermal overload reacts only to heating current. The LR9D is an electronic differential design, so on top of thermal overload it detects phase failure and load unbalance. If single-phasing is a real risk on your feeder, that is the reason to specify this over a plain thermal unit.
5) Should I order the LR9D08 or the LR9D32?
Pick by motor nameplate full-load amps. LR9D08 is the 1.6 A Motor FLA option; LR9D32 is the 6.4 A option. Both sit inside the family's 1.6 to 8 A thermal setting range, so choose the unit whose range brackets your FLA rather than relying on the top of the range.
6) What is an alternative to the Square D LR9D overload relay if the motor only needs a fixed Class 10 trip curve?
The ABB TF42-16 thermal overload relay is a Class 10 device, so it covers a single trip curve rather than a selectable one. The Square D LR9D TeSys LRD relay is electronic with a selectable tripping class of 5-10-20-30, which lets a panel builder match the curve to a longer or harder motor start. If the connected motor starts within a Class 10 curve, the fixed-class ABB TF42 is the simpler specification; if start-up profiles vary across the panel, the selectable LR9D is the one to carry.
7) Is the Eaton XT IEC miniature overload relay a direct substitute for the Square D LR9D?
They serve the same job but are not interchangeable parts. The Eaton XT IEC miniature overload relay is built for direct-to-contactor mounting, and the Square D LR9D TeSys LRD likewise installs under a contactor, but each is coordinated to its own manufacturer's contactor line, so the mounting interface does not cross over. Swapping brands means changing the contactor as well, or using the plate or rail mounting accessories for the LR9D instead of under-contactor mounting.
8) Which overload relay should I use for a 3-phase motor that needs phase loss protection, not just thermal overload?
The Square D LR9D TeSys LRD is the one to specify. It is a differential-design electronic relay that detects phase failure and load unbalance in addition to thermal overload, and it is rated 690V on the power circuit and built to EN/IEC 60947-4-1. The ABB TF42-16 is a thermal overload relay in a Class 10 configuration, which addresses overload current. For a pump or fan circuit where a dropped phase is the real failure mode, the electronic LR9D covers it directly.
9) How does the LR9D mount in a control panel - does it need a DIN rail?
Mounting is flexible: it installs directly under the contactor, on a plate, or on DIN rail using the specific accessories for that method. Rail and plate mounting kits are separate items, so order the accessory that matches your panel layout if you are not stacking it under the contactor.
10) What are the alternatives to the Square D LR9D for IEC contactor-mounted motor overload protection?
Two other IEC-style overloads sold alongside it: the ABB TF42-16 thermal overload relay, which is a fixed Class 10 bimetallic unit, and the Eaton XT IEC miniature overload relay, which mounts direct to the contactor. The LR9D differs in being electronic with a selectable trip class of 5, 10, 20 or 30 plus phase-failure and unbalance detection, so if you need class 20 or 30 for a high-inertia start, the fixed Class 10 ABB unit will not cover it.
11) Can I use an LR9D on a single-phase motor?
No. The LR9D TeSys LRD is specified for 3-phase motor protection, and its differential phase-failure and unbalance sensing assumes three legs. For a single-phase load, use an overload rated for single-phase service instead.
12) For a compact control panel with tight gear space, is the Square D LR9D or the Eaton XT IEC relay the better fit?
The Eaton XT IEC relay is a miniature overload relay that mounts directly to the contactor, which is the choice when the available footprint is the deciding constraint. The Square D LR9D TeSys LRD is also compact and mounts under the contactor, and it adds options the smaller unit does not: selectable tripping class 5-10-20-30 plus differential phase failure and load unbalance detection. Where the panel has the depth, the LR9D brings the added protection functions; where it does not, the miniature Eaton unit is the space-driven answer.
13) How well does the LR9D hold up in an electrically noisy plant?
Withstand ratings are 6 kV impulse and 2 kV common-mode surge per IEC 61000-4-5, which is the spec to point at for installations with drives, welding loads or exposed feeders. The front face is IP20 per IEC 60529, so it is finger-safe against incidental contact but needs an enclosure for dust or washdown areas.
How fast can I get the Square D LR9D08 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D LR9D08 come with a warranty?
Absolutely. The Square D LR9D08 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D LR9D08?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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