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Transparent thermal overload relay with screw-clamp terminals and manual reset button

Schneider Electric

Schneider Electric LRD3355 Overload Relay 30-40 A

SKU CH-QBB0-XQVDZ

Protects motors with 30-40 A thermal overload range and 1NO/1NC auxiliary contacts

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Protects motors from overheating with 30-40 A thermal trip range
  • Trip Class 10A ensures rapid response to overload conditions
  • 1000 V AC rating suits demanding industrial power circuits
  • Direct contactor mounting simplifies panel installation
  • Screw clamp terminals provide secure, tool-friendly wiring connections

Schneider Electric LRD3355 Overload Relay

The Schneider Electric LRD3355 is a thermal overload relay designed for industrial motor protection. It mounts directly to TeSys Deca contactors and provides adjustable current monitoring between 30 A and 40 A. Engineers and maintenance teams select it for three-phase circuits requiring IEC-style protection.

Adjustable 30 A to 40 A current range

The relay trips at Class 10A speed when motor current exceeds the dial setting between 30 A and 40 A. This single adjustment window determines whether the device matches the connected motor's full-load current. If the motor draws less than 30 A or more than 40 A, a different relay must be chosen.

1NO/1NC auxiliary contacts and screw terminals

The built-in 1NO/1NC auxiliary contact block lets the relay signal a trip event to a PLC or indicator light without extra wiring. Screw clamp terminals accept solid or stranded conductors for secure connections up to 1000 V AC. Manual reset requires local intervention after a fault clears.

Highlights

  • Protects motors from overheating with 30-40 A thermal trip range
  • Trip Class 10A ensures rapid response to overload conditions
  • 1000 V AC rating suits demanding industrial power circuits
  • Direct contactor mounting simplifies panel installation
  • Screw clamp terminals provide secure, tool-friendly wiring connections

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

What does the 30-40 A range mean once the relay is installed on a motor circuit?

The relay trips when motor current exceeds the dial setting between 30 and 40 amperes, protecting the windings from sustained overload.

How does the 1000 V AC rating and screw-clamp terminals limit what I can connect?

The relay is rated for circuits up to 1000 volts AC and accepts wire sizes suited to screw-clamp terminals on three poles.

What does direct-to-contactor mounting require on the panel?

The unit clips straight onto a compatible TeSys Deca contactor, so no separate DIN-rail space or bracket is needed.

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