LR2-D Series Thermal Overload Relay
LR2-D Series Thermal Overload Relay (2)
LR2-D Series Thermal Overload Relay | Adapted to LC1D contactor - Image 3

LR2-D Series Thermal Overload Relay | Adapted to LC1D contactor

LR2-D Series Thermal Overload Relay | Adapted to LC1D contactor

The LR2-D series thermal overload relays cover complete models from LR2-D13 to LR2-D33 with multiple adjustable current ranges, perfectly plug-in matched with LC1D three-phase AC contactors. Adopted solid pure copper conductive pins for low resistance and stable conductivity, with switchable manual/auto reset and standard 1NO+1NC auxiliary contacts. It provides integrated overload, phase loss and three-phase unbalance protection for industrial motors, covering tiny low-power to medium-power motor load scenarios for machine tools, pumps, fans and automation equipment.

The LR2-D series thermal overload relays cover complete models from LR2-D13 to LR2-D33 with multiple adjustable current ranges, perfectly plug-in matched with LC1D three-phase AC contactors. Adopted solid pure copper conductive pins for low resistance and stable conductivity, with switchable manual/auto reset and standard 1NO+1NC auxiliary contacts. It provides integrated overload, phase loss and three-phase unbalance protection for industrial motors, covering tiny low-power to medium-power motor load scenarios for machine tools, pumps, fans and automation equipment.

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1. Product Overview

The LR2-D series thermal overload relay is a matched protection accessory for LC1D TeSys AC contactors, designed to protect 3-phase asynchronous motors from overload, phase loss and unbalanced current damage. The full series spans LR2-D13, LR2-D23 up to LR2-D33, with segmented adjustable current ranges to cover 0.1A ~ 93A motor loads.

All models adopt thick pure copper plug pins for excellent heat dissipation and conductivity, dual manual/automatic reset modes, transparent adjustable current dial and standard 1NO+1NC fault signal contacts. The plug-in modular design enables direct assembly with corresponding LC1D contactors without extra brackets, widely used in industrial machinery, HVAC, pump stations and automation control cabinets.

2. Core Product Features

1. Complete Full Range from LR2-D13 to LR2-D33

Segmented current specifications cover all common small & medium three-phase motor currents, one-stop matching for LC1D09 ~ LC1D95 contactors, no need to select different relay series.

2. High-Conductivity Solid Pure Copper Plug Pins

Low contact resistance, less heat accumulation under long full-load operation, anti-oxidation, avoid poor contact failure, extend service life.

3. Visible Adjustable Current Calibration Dial

Transparent window dial with clear current scale, easy to align with motor rated current for accurate overload threshold setting.

4. Switchable Dual Reset Modes

  • Manual Reset: Lock after tripping, press red button to reset, ideal for safety-critical manned equipment
  • Auto Reset: Automatically recover after cooling down, suitable for unattended circulating equipment

5. Standard 1NO + 1NC Auxiliary Contacts

95/96 NC contact: Cut contactor coil circuit to stop motor during fault

97/98 NO contact: Output alarm signal to indicator light or PLC for fault monitoring

6. 3-in-1 Motor Safety Protection

Overload trip, phase loss fast cut-off, three-phase current unbalance protection, prevent motor winding burnout.

7. Plug & Play Matching Structure

Directly plug onto matched LC1D AC contactor, save cabinet space and assembly time for control panel manufacturers.

3. Working Conditions

  1. Ambient operating temperature: -20℃ ~ +55℃
  2. Protection grade: IP20, only installed inside indoor distribution cabinets, not for outdoor exposure
  3. Surrounding air: Free of corrosive gas, flammable and conductive dust
  4. Altitude: Stable performance below 2000m above sea level
  5. Vibration: Resist normal workshop mechanical vibration; avoid long-term strong impact
  6. Humidity: Relative humidity ≤85%, no condensation on device surface

4. Full Model & Adjustable Current Spec Table (LR2-D13 ~ LR2-D33)

Model Number Adjustable Rated Current Range Matched LC1D Contactor
LR2-D1301 0.10 ~ 0.16A LC1D09 / LC1D12 / LC1D18
LR2-D1302 0.16 ~ 0.25A LC1D09 / LC1D12 / LC1D18
LR2-D1303 0.25 ~ 0.40A LC1D09 / LC1D12 / LC1D18
LR2-D1304 0.40 ~ 0.63A LC1D09 / LC1D12 / LC1D18
LR2-D1305 0.63 ~ 1.00A LC1D09 / LC1D12 / LC1D18
LR2-D1306 1.00 ~ 1.60A LC1D09 / LC1D12 / LC1D18
LR2-D1307 1.60 ~ 2.50A LC1D09 / LC1D12 / LC1D18
LR2-D1308 2.50 ~ 4.00A LC1D09 / LC1D12 / LC1D18
LR2-D1310 4.00 ~ 6.00A LC1D09 / LC1D12 / LC1D18
LR2-D1312 5.50 ~ 8.00A LC1D09 / LC1D12 / LC1D18
LR2-D1316 9.00 ~ 13A LC1D09 / LC1D12 / LC1D18
LR2-D1321 12~18A LC1D25 / LC1D32
LR2-D1322 17~25A LC1D25 / LC1D32
LR2-D1353 23~32A LC1D25 / LC1D32
LR2-D2353 12 ~ 18A LC1D25 / LC1D32
LR2-D2355 16 ~ 24A LC1D25 / LC1D32
LR2-D3357 23 ~ 32A LC1D32
LR2-D3359 48~65A LC1D40~LC1D95
LR2-D3361 55~70A LC1D65~LC1D95
LR2-D3363 63~80A LC1D80/LC1D95
LR2-D3365 80~93A LC1D95

Unified General Technical Parameters for All LR2-D Series

Parameter Unified Specification
Protection Principle Bimetallic thermal induction
Reset Mode Switchable Manual / Auto Reset
Auxiliary Contacts 1NO (97-98) + 1NC (95-96)
Conductive Pin Material Solid pure copper
Installation Direct plug-in matched LC1D contactor
Standard Compliance IEC 60947-4-1
Housing Material Flame-retardant engineering plastic
Core Protection Overload / Phase Loss / 3-Phase Unbalance

5. Typical Applications

  • Three-phase motor control for CNC machine tools, printing and textile machinery
  • Fan, water pump, compressor and refrigeration equipment control panels
  • HVAC air conditioning, lifting and conveying industrial equipment
  • Small factory power distribution cabinets, irrigation machinery
  • Automated production line motor drive control systems

6. Frequently Asked Questions (FAQ)

1. Which LC1D contactor matches each LR2-D model?

  • LR2-D12 full sub-models: Match LC1D09, LC1D12, LC1D18
  • LR2-D23 series: Match LC1D25, LC1D32
  • LR2-D33 series: Match LC1D32~LC1D95

2. How to choose the correct current specification for my motor?

Check the rated current marked on your three-phase motor nameplate, select the LR2-D model whose adjustable range fully covers this rated current value.

3. What’s the advantage of pure copper pins compared to iron plated pins?

Solid copper has far better electrical conductivity, generates less heat under continuous load, effectively avoids oxidation and loose contact faults, greatly extends relay service life.

4. Can all LR2-D models switch between manual and auto reset?

Yes, every model in LR2-D12 ~ LR2-D33 is equipped with a side toggle switch to freely switch two reset modes.

5. Does this series support phase loss protection?

All LR2-D series integrate phase loss protection structure. When single-phase power cuts off, uneven heating of bimetallic strips will trigger rapid trip to protect the motor from single-phase burnout.

6. Can LR2-D thermal relay work alone without AC contactor?

It cannot operate independently. It must be matched with the corresponding LC1D 3P contactor to form a complete motor start-stop and overload protection circuit.

7. Technical documentation and support

Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.

1. Product Overview

The LR2-D series thermal overload relay is a matched protection accessory for LC1D TeSys AC contactors, designed to protect 3-phase asynchronous motors from overload, phase loss and unbalanced current damage. The full series spans LR2-D13, LR2-D23 up to LR2-D33, with segmented adjustable current ranges to cover 0.1A ~ 93A motor loads.

All models adopt thick pure copper plug pins for excellent heat dissipation and conductivity, dual manual/automatic reset modes, transparent adjustable current dial and standard 1NO+1NC fault signal contacts. The plug-in modular design enables direct assembly with corresponding LC1D contactors without extra brackets, widely used in industrial machinery, HVAC, pump stations and automation control cabinets.

2. Core Product Features

1. Complete Full Range from LR2-D13 to LR2-D33

Segmented current specifications cover all common small & medium three-phase motor currents, one-stop matching for LC1D09 ~ LC1D95 contactors, no need to select different relay series.

2. High-Conductivity Solid Pure Copper Plug Pins

Low contact resistance, less heat accumulation under long full-load operation, anti-oxidation, avoid poor contact failure, extend service life.

3. Visible Adjustable Current Calibration Dial

Transparent window dial with clear current scale, easy to align with motor rated current for accurate overload threshold setting.

4. Switchable Dual Reset Modes

  • Manual Reset: Lock after tripping, press red button to reset, ideal for safety-critical manned equipment
  • Auto Reset: Automatically recover after cooling down, suitable for unattended circulating equipment

5. Standard 1NO + 1NC Auxiliary Contacts

95/96 NC contact: Cut contactor coil circuit to stop motor during fault

97/98 NO contact: Output alarm signal to indicator light or PLC for fault monitoring

6. 3-in-1 Motor Safety Protection

Overload trip, phase loss fast cut-off, three-phase current unbalance protection, prevent motor winding burnout.

7. Plug & Play Matching Structure

Directly plug onto matched LC1D AC contactor, save cabinet space and assembly time for control panel manufacturers.

3. Working Conditions

  1. Ambient operating temperature: -20℃ ~ +55℃
  2. Protection grade: IP20, only installed inside indoor distribution cabinets, not for outdoor exposure
  3. Surrounding air: Free of corrosive gas, flammable and conductive dust
  4. Altitude: Stable performance below 2000m above sea level
  5. Vibration: Resist normal workshop mechanical vibration; avoid long-term strong impact
  6. Humidity: Relative humidity ≤85%, no condensation on device surface

4. Full Model & Adjustable Current Spec Table (LR2-D13 ~ LR2-D33)

Model Number Adjustable Rated Current Range Matched LC1D Contactor
LR2-D1301 0.10 ~ 0.16A LC1D09 / LC1D12 / LC1D18
LR2-D1302 0.16 ~ 0.25A LC1D09 / LC1D12 / LC1D18
LR2-D1303 0.25 ~ 0.40A LC1D09 / LC1D12 / LC1D18
LR2-D1304 0.40 ~ 0.63A LC1D09 / LC1D12 / LC1D18
LR2-D1305 0.63 ~ 1.00A LC1D09 / LC1D12 / LC1D18
LR2-D1306 1.00 ~ 1.60A LC1D09 / LC1D12 / LC1D18
LR2-D1307 1.60 ~ 2.50A LC1D09 / LC1D12 / LC1D18
LR2-D1308 2.50 ~ 4.00A LC1D09 / LC1D12 / LC1D18
LR2-D1310 4.00 ~ 6.00A LC1D09 / LC1D12 / LC1D18
LR2-D1312 5.50 ~ 8.00A LC1D09 / LC1D12 / LC1D18
LR2-D1316 9.00 ~ 13A LC1D09 / LC1D12 / LC1D18
LR2-D1321 12~18A LC1D25 / LC1D32
LR2-D1322 17~25A LC1D25 / LC1D32
LR2-D1353 23~32A LC1D25 / LC1D32
LR2-D2353 12 ~ 18A LC1D25 / LC1D32
LR2-D2355 16 ~ 24A LC1D25 / LC1D32
LR2-D3357 23 ~ 32A LC1D32
LR2-D3359 48~65A LC1D40~LC1D95
LR2-D3361 55~70A LC1D65~LC1D95
LR2-D3363 63~80A LC1D80/LC1D95
LR2-D3365 80~93A LC1D95

Unified General Technical Parameters for All LR2-D Series

Parameter Unified Specification
Protection Principle Bimetallic thermal induction
Reset Mode Switchable Manual / Auto Reset
Auxiliary Contacts 1NO (97-98) + 1NC (95-96)
Conductive Pin Material Solid pure copper
Installation Direct plug-in matched LC1D contactor
Standard Compliance IEC 60947-4-1
Housing Material Flame-retardant engineering plastic
Core Protection Overload / Phase Loss / 3-Phase Unbalance

5. Typical Applications

  • Three-phase motor control for CNC machine tools, printing and textile machinery
  • Fan, water pump, compressor and refrigeration equipment control panels
  • HVAC air conditioning, lifting and conveying industrial equipment
  • Small factory power distribution cabinets, irrigation machinery
  • Automated production line motor drive control systems

6. Frequently Asked Questions (FAQ)

1. Which LC1D contactor matches each LR2-D model?

  • LR2-D12 full sub-models: Match LC1D09, LC1D12, LC1D18
  • LR2-D23 series: Match LC1D25, LC1D32
  • LR2-D33 series: Match LC1D32~LC1D95

2. How to choose the correct current specification for my motor?

Check the rated current marked on your three-phase motor nameplate, select the LR2-D model whose adjustable range fully covers this rated current value.

3. What’s the advantage of pure copper pins compared to iron plated pins?

Solid copper has far better electrical conductivity, generates less heat under continuous load, effectively avoids oxidation and loose contact faults, greatly extends relay service life.

4. Can all LR2-D models switch between manual and auto reset?

Yes, every model in LR2-D12 ~ LR2-D33 is equipped with a side toggle switch to freely switch two reset modes.

5. Does this series support phase loss protection?

All LR2-D series integrate phase loss protection structure. When single-phase power cuts off, uneven heating of bimetallic strips will trigger rapid trip to protect the motor from single-phase burnout.

6. Can LR2-D thermal relay work alone without AC contactor?

It cannot operate independently. It must be matched with the corresponding LC1D 3P contactor to form a complete motor start-stop and overload protection circuit.

7. Technical documentation and support

Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.

Data Download

LVMA low voltage selection manual

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