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Transparent rectangular relay with screw terminals and a current-setting dial

Schneider Electric

Schneider Electric LR3D340 Overload Relay 30-40A 690V

SKU CH-8XR9-02Y6Z

Protects three-phase motors from 30 A to 40 A at 690 V AC with trip class 10A and auto or manual reset

  • Product typeIndustrial Electrical Controls & Automation
  • Product colorTransparent
  • Protects motors from 30 to 40 A overloads with IEC thermal relay
  • Handles up to 690 V AC for industrial three-phase systems
  • Auto and manual reset options restore operation after a trip
  • Screw-clamp terminals give secure wiring without special tools
  • Mounts directly on TeSys Deca contactors for compact panel layout

Schneider Electric LR3D340 Overload Relay 30-40A

The Schneider Electric LR3D340 is a thermal overload relay designed for motor protection in industrial control circuits. It suits maintenance engineers and panel builders who need reliable overload detection for three-phase motors operating up to 690V AC. The unit mounts directly to compatible TeSys Deca contactors for compact installation.

Trip Class 10A and 30-40A adjustment range

This relay operates with Trip Class 10A response characteristics for standard motor starting profiles. The adjustable current setting spans 30 A minimum to 40 A maximum, limiting use to motors whose full-load current falls strictly within this window. Screw clamp terminals accept control wiring for the 1NO/1NC auxiliary contact block.

Replaces fixed-heater or lower-range relays

The LR3D340 replaces older fixed-trip relays or units with narrower adjustment ranges when motor loads demand the 30-40A window. The jump is worthwhile when upgrading panels to IEC-style thermal protection with direct contactor mounting and auto-manual reset flexibility. It does not serve applications requiring currents below 30 A or above 40 A.

How it compares

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Price $103.99
Pricier than about 75% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameSCHNEIDER ELECTRIC
Product typeIndustrial Electrical Controls & Automation
Product colorTransparent

Questions about this item

Should I pick the 30 A or the 40 A setting for my motor?

Choose the dial position so the motor full-load current sits between 30 A and 40 A; the relay will trip on sustained overload above that setting.

What does the 690 V rating mean when the relay is installed?

It is the maximum voltage the relay insulation is rated for, so it can be used on systems up to 690 V AC.

Does the screw-clamp terminal accept standard IEC wire sizes?

The terminals are screw-clamp type designed for direct mounting to TeSys Deca contactors and accept conductors sized for 30 A to 40 A loads.

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