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Transparent Schneider Electric LR3D350 overload relay with screw-clamp terminals

Schneider Electric

Schneider Electric LR3D350 Overload Relay 37-50 A

SKU CH-B6SP-53M30

Protects three-phase motors from 37 A to 50 A with auto or manual reset and 1NO/1NC auxiliary contacts

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection for motors up to 50 A
  • Adjustable current setting from 37 A to 50 A
  • Trip class 10A ensures fast response to faults
  • 690 V AC rating suits industrial power systems
  • Direct contactor mounting with screw clamp terminals

Industrial Overload Relay for Motor Protection

The Schneider Electric LR3D350 is a thermal overload relay designed for three-phase motor circuits. It suits maintenance engineers and panel builders who need reliable overload protection in industrial control panels. The device mounts directly to compatible TeSys Deca contactors for quick installation.

Current Range 37 to 50 Amperes with Trip Class 10A

The adjustable dial covers a minimum setting of 37 A and a maximum of 50 A, giving headroom for motors operating in that band. Trip Class 10A provides a standard tripping profile for general-purpose motor loads. Settings above 50 A fall outside the calibrated range and are not supported.

Screw Clamp Terminals Rated to 690 V AC

Power connections use screw clamp terminals suitable for voltages up to 690 V AC. The relay includes one normally open and one normally closed auxiliary contact for signalling or interlocking. Automatic and manual reset modes are selectable on the front. NEMA sizing does not apply to this IEC-style relay.

Highlights

  • Thermal overload protection for motors up to 50 A
  • Adjustable current setting from 37 A to 50 A
  • Trip class 10A ensures fast response to faults
  • 690 V AC rating suits industrial power systems
  • Direct contactor mounting with screw clamp terminals

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Will the LR3D350 fit my existing TeSys Deca contactor without extra brackets?

The relay mounts directly to compatible TeSys Deca contactors, so no separate bracket is required for those models.

How do I know the thermal trip is set correctly after wiring the screw-clamp terminals?

Adjust the dial between 37 A and 50 A to match your motor full-load current; the relay will then trip on overload per its class 10A curve.

Does the package include the 1 NO / 1 NC auxiliary contact block or must I order it separately?

The auxiliary contact block with one normally-open and one normally-closed contact is built into the relay, so nothing extra is needed for signalling.

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