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Transparent overload relay with screw terminals and auxiliary contacts

Schneider Electric

Schneider Electric LRD03 Overload Relay 0.25-0.40 A 690V AC

SKU CH-S6W7-PZNA5

Three-pole thermal overload relay with 0.25–0.40 A range and 690 V AC rating

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection for motors up to 0.4 A
  • Adjustable current range from 0.25 A to 0.4 A
  • Trip Class 10A responds quickly to overcurrent
  • Rated for 690 V AC in three-phase circuits
  • Screw clamp terminals and direct contactor mounting

Industrial Overload Relay 0.25-0.40 A

The Schneider Electric LRD03 is a thermal overload relay designed for motor protection in industrial control panels. It mounts directly to TeSys Deca contactors and suits applications requiring adjustable current monitoring within a narrow range. The unit provides reliable trip functionality for three-pole circuits.

Thermals and Power Characteristics

Thermal trip Class 10A responds to sustained overcurrent conditions to protect connected motors. The relay operates across a 0.25 A to 0.40 A setting range at up to 690V AC. Auxiliary contacts include one normally open and one normally closed circuit for status signalling. Power draw is limited to the control circuit itself.

Mounting and Connection Benefits

Direct contactor mounting reduces panel space and wiring time compared to separate DIN-rail units. Screw clamp terminals accept standard ferrules or bare wire for secure connections without specialised tools. Auto and manual reset modes allow flexible recovery procedures after a trip event. Transparent housing aids visual inspection of contact status.

Highlights

  • Thermal overload protection for motors up to 0.4 A
  • Adjustable current range from 0.25 A to 0.4 A
  • Trip Class 10A responds quickly to overcurrent
  • Rated for 690 V AC in three-phase circuits
  • Screw clamp terminals and direct contactor mounting

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

How is the overload relay mounted to the contactor and what wiring step is often missed?

The relay mounts directly to a compatible TeSys Deca contactor and connects via screw clamp terminals; the step often missed is tightening each terminal to the specified torque so the 3-pole power circuit remains secure under vibration.

What maintenance or replacement will the LRD03 need over time?

The thermal overload element may drift after repeated trips at the 0.4 A maximum setting, so periodic verification of the 0.25–0.40 A adjustment range and replacement of the complete relay is recommended when calibration can no longer be held.

What limit appears first during sustained overloads on this relay?

The Trip Class 10A characteristic trips within the defined time at 690 V AC, so the thermal trip curve is the first limit reached before the 1NO/1NC auxiliary contacts change state.

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