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Transparent rectangular relay housing with screw terminals and direct contactor mounting face

Schneider Electric

Schneider Electric LR3D332 Overload Relay 23-32 A 690 V AC

SKU CH-CNY3-BR076

A thermal overload relay with 23 to 32 A range and 690 V AC rating protects three-phase motors

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Protects motors with adjustable 23-32 A thermal overload range
  • Handles up to 690 V AC for industrial power systems
  • Offers 1NO/1NC auxiliary contacts for flexible control wiring
  • Supports both automatic and manual reset for operational convenience
  • Mounts directly to TeSys Deca contactors with screw clamp terminals

Purpose and fit

The Schneider Electric LR3D332 is a thermal overload relay designed to protect three-phase motor circuits rated up to 32 A at 690 V AC. It suits panel builders and maintenance engineers who need IEC-style protection that mounts directly onto a compatible TeSys Deca contactor.

Thermals noise and power

The device operates passively with no fan or active cooling, so it adds no audible noise to the enclosure. Trip class 10A defines its thermal response curve, while the adjustable dial sets the overload threshold anywhere between 23 A and 32 A. Power draw is limited to the control circuit feeding the contactor coil.

Build and connections

A transparent housing lets technicians verify the dial position and trip status at a glance. Screw clamp terminals accept standard ferrules or bare wire for the 1NO/1NC auxiliary contacts, and the direct-to-contactor mounting style eliminates the need for a separate DIN-rail footprint. Auto and manual reset modes are selectable on the front face.

Highlights

  • Protects motors with adjustable 23-32 A thermal overload range
  • Handles up to 690 V AC for industrial power systems
  • Offers 1NO/1NC auxiliary contacts for flexible control wiring
  • Supports both automatic and manual reset for operational convenience
  • Mounts directly to TeSys Deca contactors with screw clamp terminals

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

How do I mount the LR3D332 directly onto a TeSys Deca contactor and which screw-clamp terminals do I tighten first?

Align the relay with the contactor's mounting rails, secure the three main-pole screw-clamp terminals first, then tighten the auxiliary 1NO/1NC contacts to ensure proper mechanical and electrical connection.

When should I expect to replace the thermal overload element on a 23-32 A relay running at 690 V AC?

The thermal element is calibrated for Trip Class 10A; replace the complete relay if it trips repeatedly at the set current or after a confirmed overload event, as the bimetal strips cannot be serviced separately.

What is the first limitation I will hit when running this relay continuously at 32 A in a 690 V AC circuit?

Sustained operation at the 32 A maximum setting reaches the Trip Class 10A thermal limit first, causing the relay to open the 1NC/1NO auxiliary contacts and disconnect the motor starter.

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