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Product name
Product or component type
differential thermal overload relay
Device short name
Relay application
motor protection
Product compatibility
  • LC1D40A
  • LC1D50A
  • LC1D65A
    • Network type
    • DC
    • AC
      • Thermal protection adjustment range
        12-18 A
        [Ui] rated insulation voltage
      • power circuit: 600 V conforming to CSA
      • power circuit: 600 V conforming to UL
      • power circuit: 690 V conforming to IEC 60947-4-1
        • Network frequency
          0...400 Hz
          Mounting support
        • plate, with specific accessories
        • rail, with specific accessories
        • under contactor
          • Tripping threshold
            1.14 +/- 0.06 Ir conforming to IEC 60947-4-1
            [Ith] conventional free air thermal current
            5 A for signalling circuit
            Permissible current
          • 0.95 A at 380 V AC-15 for signalling circuit
          • 0.06 A at 440 V DC-13 for signalling circuit
            • [Ue] rated operational voltage
              690 V AC 0...400 Hz
              [Uimp] rated impulse withstand voltage
              Phase failure sensitivity
              tripping current 130 % of Ir on two phase, the last one at 0
              Control type
            • red push-button: stop
            • blue push-button: reset
              • Temperature compensation
                -20-60 °C
                Connections - terminals
              • control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² flexible without cable end
              • control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² flexible with cable end
              • control circuit: screw clamp terminals 2 cable(s) 1-2.5 mm² solid without cable end
              • power circuit: EverLink BTR screw connectors 1 cable(s) 1-35 mm² flexible without cable end
              • power circuit: EverLink BTR screw connectors 1 cable(s) 1-35 mm² flexible with cable end
              • power circuit: EverLink BTR screw connectors 1 cable(s) 1-35 mm² solid without cable end
                • Tightening torque
                • control circuit: 1.7 N.m - on screw clamp terminals
                • power circuit: 5 N.m - on EverLink BTR screw connectors
                  • Height
                    70 mm
                    55 mm
                    123 mm
                    Net weight
                    0.375 kg
                    Compatibility code
                    Protective treatment
                    TH conforming to IEC 60068
                    IP degree of protection
                    IP20 conforming to IEC 60529
                    Ambient air temperature for operation
                    -20-60 °C without derating conforming to IEC 60947-4-1
                    Ambient air temperature for storage
                    -60-70 °C
                    Flame retardance
                    V1 conforming to UL 94
                    Mechanical robustness
                  • shocks: 15 Gn for 11 ms conforming to IEC 60068-2-7
                  • vibrations: 4 gn conforming to IEC 60068-2-6
                    • Dielectric strength
                      6 kV at 50 Hz conforming to IEC 60255-5
                    • ATEX D 94/9/CE
                    • EN 60947-5-1
                    • IEC 60947-5-1
                    • CSA C22.2 No 14
                    • UL 508
                    • EN 60947-4-1
                    • IEC 60947-4-1
                      • Product certifications
                      • GL
                      • LROS (Lloyds register of shipping)
                      • GOST
                      • UL
                      • CSA
                      • DNV
                      • ATEX INERIS
                      • RINA
                      • CCC
                      • BV
                        • Unit Type of Package 1
                          Number of Units in Package 1
                          Package 1 Weight
                          392 g
                          Package 1 Height
                          6.1 cm
                          Package 1 width
                          10.5 cm
                          Package 1 Length
                          13.6 cm
                          Unit Type of Package 2
                          Number of Units in Package 2
                          Package 2 Weight
                          5.422 kg
                          Package 2 Height
                          15 cm
                          Package 2 width
                          30 cm
                          Package 2 Length
                          40 cm
                          Sustainable offer status
                          Green Premium product
                          REACh free of SVHC
                          EU RoHS Directive
                          Toxic heavy metal free
                          Mercury free
                          RoHS exemption information
                          China RoHS Regulation
                           Pro-active China RoHS declaration (out of China RoHS legal scope)
                          Environmental Disclosure
                          Circularity Profile
                          18 months

                          Documents & downloads

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                          • CAD Files and Packs

                          • Product Brochures

                          • Technical Data Catalogues

                          • End of Life Manual

                          • Product Environmental

                          • Installation Instruction

                          • Certificates (MSDS)

                          • Declaration of Conformity

                          Frequently Asked Questions

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                          What are the wiring terminals on the IEC LRD* overload relays?

                          Product Line:
                          Tesys D line Overload Relays
                          The normally closed overload contact are terminals 95 & 96; and the normally open overload contact are terminals 97 & 98.
                          T1 T2 and T3 are the load terminals. 

                          The normally closed control circuit contact will open when there is a fault, this contact is typically used in series with the control circuit. 

                          The normally open trip signal contact closes when a fault occurs which is typically used to control a pilot light, or alarm. 


                          What overload can be used with an LC1D65AU7?

                          You can use the Everlink range which is LRD313 - LRD365

                          What is the difference between the LA7D305 and LAD7305, remote control reset mechanism by flexible cable?

                          Identifying differences between two similar part numbers.

                          Product Line:
                          IEC contactors and starters

                          Products sold and used in the United States

                          Choosing the correct part number

                          LAD7305 is for use on LRD01 to LRD35 , LR3D01 to LR3D35, and LRD313 to LRD365.
                          LA7D305 is for use on all other relays (except LRD01 to LRD35 and LR3D01 to LR3D35).


                          What is the difference between a LR3D21 and LRD21?

                          What is the Overload for LC1D50AU7 range is 37..50 Amps?


                          What is the replacement overload similar to LR2D1301

                          LR2D1301 discontinued 30/11/2003. Use a LRD01.

                          What is the part number for a class 20 version of the LRD340

                           The part code LRD340L

                          What is the setting range for an LRD350

                           The setting range is  37 - 50A

                          What is the Din rail terminal block to suit the LRD12?

                          The LAD7B106 fits the LRD01 to LRD35 range.

                          What is the replacement for the old thermal overload relay LR2D3359?

                          The part number is as follows: LRD365

                          What overload can be used for the LC1D32 contactor @16amps?

                          either the LRD21, 12 to 18 amps.
                          Or the LRD22, 16 to 24 amps.

                          What is the interlock for LCD18

                           The part code is LAD9R1V
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