SQUARE D
SQUARE D LR3D08L Overload Relay 2.5-4A Trip Class 20 690V AC
Thermal overload relay protects three-phase motors with a 2.5 to 4 A trip range, Trip Class 20 and 690 V AC rating
- Protects motors with 2.5–4 A adjustable thermal overload
- Trip Class 20 delays nuisance trips during motor start-up
- Rated for 690 V AC three-phase industrial supplies
- Direct contactor mounting cuts panel wiring time
- Auto and manual reset options simplify fault recovery
SQUARE D LR3D08L Overload Relay
The SQUARE D LR3D08L is a thermal overload relay designed to protect three-phase motors in industrial control panels. It mounts directly onto compatible TeSys Deca contactors and suits maintenance engineers and panel builders who need reliable overload protection for motor circuits.
Thermals noise and power draw
As a thermal overload relay the device generates negligible heat and produces no audible noise during normal operation. It draws no separate control power and its screw clamp terminals ensure secure wiring for continuous duty in electrical starter assemblies.
Adjustable trip range 2.5 to 4 A
The relay trips when motor current exceeds the adjustable setting between 2.5 A and 4 A using Trip Class 20 timing. Buyers who need a higher or lower current range must select a different relay model.
Highlights
- Protects motors with 2.5–4 A adjustable thermal overload
- Trip Class 20 delays nuisance trips during motor start-up
- Rated for 690 V AC three-phase industrial supplies
- Direct contactor mounting cuts panel wiring time
- Auto and manual reset options simplify fault recovery
Specifications
| Brand | SCHNEIDER ELECTRIC |
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Questions about this item
How do I mount the LR3D08L directly to a TeSys Deca contactor and which step is often missed?
Align the relay on the contactor, tighten the screw-clamp terminals to the specified torque, then set the dial to the motor's full-load current between 2.5 A and 4 A; the dial adjustment is the step most often forgotten.
What maintenance will the LR3D08L need over time?
Periodically check the screw-clamp terminals for tightness, verify the trip dial has not shifted, and test the 1NO/1NC auxiliary contacts for reliable operation after any trip event.
What limit appears first when the LR3D08L runs continuously at high load?
The thermal trip curve of Class 20 operates first; sustained current above the 4 A dial setting will cause the relay to open the 1NC contact and close the 1NO contact, removing power to the contactor coil.
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