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Schneider Electric LRD12 thermal overload relay, transparent housing

Schneider Electric

Schneider Electric LRD12 Overload Relay 5.5-8 A

SKU CH-A74G-13MS6

Protects motors with adjustable 5.5 to 8 A thermal overload trips for TeSys D contactors up to 38 A

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Protects motor windings with adjustable 5.5-8 A trip current
  • Compatible with TeSys D contactors from 9 A to 38 A
  • Class 10A calibrated trip rating for reliable overload detection
  • Multi-standard certified including IEC, UL, CSA, CCC, EAC, ATEX, Marine
  • Works with contactor to disconnect power on overcurrent detection

Motor starter protection

The Schneider Electric LRD12 overload relay pairs with TeSys D contactors to protect motors from overcurrent damage. It covers a trip range of 5.5 to 8 amperes and is calibrated to Class 10A. The unit is certified to IEC, UL, CSA, CCC, EAC, ATEX and Marine standards. It suits maintenance engineers and panel builders who need reliable motor-circuit protection.

Thermal response and power impact

Differential thermal sensing reacts to sustained overloads rather than momentary peaks, reducing nuisance trips during normal motor starts. The relay draws negligible control-circuit power and adds no audible noise to the panel. Its calibrated trip curve limits winding heating without affecting the contactor’s switching duty.

Mounting and connectivity

The relay mounts directly onto 9 to 38 amp TeSys D contactors, keeping the starter footprint compact. Front-mounted 1NC plus 1NO auxiliary contacts give clear trip indication and simple control-circuit integration. Transparent housing allows visual confirmation of contact status. Buyers needing protection outside the 5.5 to 8 ampere range or a different contact arrangement must select another model.

Highlights

  • Protects motor windings with adjustable 5.5-8 A trip current
  • Compatible with TeSys D contactors from 9 A to 38 A
  • Class 10A calibrated trip rating for reliable overload detection
  • Multi-standard certified including IEC, UL, CSA, CCC, EAC, ATEX, Marine
  • Works with contactor to disconnect power on overcurrent detection

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

How do I install the LRD12 overload relay with a TeSys D contactor and which step is often missed?

Mount the relay directly onto a 9 A to 38 A TeSys D contactor and set the adjustment dial to the motor full-load current within the 5.5 A to 8 A range; the step often missed is calibrating the dial to the exact motor current before commissioning.

What maintenance or replacement will the LRD12 overload relay need over time?

The relay requires no scheduled part replacement; periodically verify the trip setting remains at the correct 5.5 A to 8 A value and inspect terminals for tightness and signs of overheating.

What limit appears first when the LRD12 runs at full load continuously?

The Class 10A thermal trip curve is the first limit reached; sustained current above the 5.5 A to 8 A setting will cause the relay to open the contactor within the Class 10A time-current characteristic.

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