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Transparent rectangular overload relay with screw terminals and manual reset button

Schneider Electric

Schneider Electric LRD340 Overload Relay 30-40A 690V AC

SKU CH-TPAZ-3ZDPP

Thermal overload relay protects three-phase motors from 30 to 40 amps at 690 volts AC with manual reset and screw terminals

  • Product typeIndustrial Electrical Controls & Automation
  • Product colorTransparent
  • Protects motors from overload with 30-40 A thermal range
  • Handles up to 690 V AC for industrial power circuits
  • Manual reset lets you confirm fault clearance before restart
  • Screw-clamp terminals give secure wiring without special tools
  • Direct contactor mounting saves panel space and install time

Industrial Overload Relay 30-40A

The Schneider Electric LRD340 is a thermal overload relay designed for industrial motor protection. It provides a current setting range from 30 A to 40 A with a maximum voltage rating of 690V AC. The unit features 1NO/1NC auxiliary contacts and mounts directly to compatible TeSys Deca contactors using screw clamp terminals.

Sustained Load Trip Class 10A

Under continuous operation the relay follows Trip Class 10A characteristics, meaning it will trip within a defined time when current exceeds the set threshold. The thermal protection mechanism responds to prolonged overcurrent rather than momentary peaks, helping prevent motor damage during extended heavy-duty cycles. Manual reset ensures deliberate restart after a fault condition.

Thermal Operation Direct Contactor Mount

Heat dissipation occurs through direct mounting on the contactor, keeping the assembly compact inside the panel. The thermal sensing element operates without external power, so there is no additional control-circuit consumption. Screw clamp terminals maintain secure connections under vibration, supporting reliable performance in typical industrial environments.

How it compares

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Price $94.99
Pricier than about 73% 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

How much heat does the LRD340 generate when running at 40 A all day?

The relay is a thermal overload device rated for 30-40 A at 690 V AC with Trip Class 10A; it trips on sustained over-current rather than producing continuous waste heat.

What contactor must I already own to mount this relay directly?

It mounts directly to TeSys Deca series contactors using screw-clamp terminals and requires a compatible 3-pole contactor from that range.

Will the manual reset work with my existing control circuit that expects auto-reset?

The LRD340 uses manual reset only, so your control circuit must provide a deliberate reset action after a trip; it will not re-close automatically.

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