LRD Thermal Overload Relay | 0.1A-65A Motor Protection Relay
LRD Thermal Overload Relay | 0.1A-65A Motor Protection Relay
The LRD series thermal overload relay is a dedicated motor protection accessory perfectly matched with LC1D 3P AC contactors, covering adjustable current range from 0.1A to 65A. Equipped with phase loss protection, temperature compensation design and dual manual/auto reset function, it integrates clear trip status indicator and standard 1NO+1NC auxiliary contacts. Compliant with IEC60947-4-1 & GB14048.4 standards, it safeguards three-phase motors against overload, phase loss and unbalanced current faults, widely used in industrial machinery, pumps, fans and automation control panels.
The LRD series thermal overload relay is a dedicated motor protection accessory perfectly matched with LC1D 3P AC contactors, covering adjustable current range from 0.1A to 65A. Equipped with phase loss protection, temperature compensation design and dual manual/auto reset function, it integrates clear trip status indicator and standard 1NO+1NC auxiliary contacts. Compliant with IEC60947-4-1 & GB14048.4 standards, it safeguards three-phase motors against overload, phase loss and unbalanced current faults, widely used in industrial machinery, pumps, fans and automation control panels.
1. Product Overview
The LRD series thermal overload relay is an official matched protection component for LC1D three-phase AC contactors, designed to provide all-round safety protection for asynchronous three-phase motors. The full series covers an ultra-wide adjustable current range of 0.1A to 65A, with multiple sub-models to match small low-power to medium-large industrial motors.
Manufactured under strict Schneider original standards and compliant with IEC60947-4-1 international & GB14048.4 national standards, this relay adopts bimetallic thermal induction principle with built-in temperature compensation module. It supports phase loss anti-burn protection, switchable manual/automatic reset, visible trip action indicator and standard 1NO+1NC signal contacts. Plug-in modular design enables direct quick assembly on corresponding LC1D contactors, widely applied in machine tools, HVAC, water pumps, compressors and automated production lines.
2. Core Product Features
1. Full Wide Current Range (0.1A ~ 65A)
2. Built-in Phase Loss Protection
3. Professional Temperature Compensation Design
4. Dual Reset Modes with Visible Action Indicator
- Manual Reset: Red STOP button, lock after tripping, manual reset required, ideal for manned high-safety equipment
- Auto Reset: Blue RESET toggle switch to switch mode, auto reset after cooling down for unattended circulating equipment
- Transparent window trip indicator clearly shows overload trip status at a glance
5. Standard 1NO + 1NC Auxiliary Contacts
- 95-96 NC contact: Series into contactor coil circuit to cut off motor power during overload fault
- 97-98 NO contact: Output fault alarm signal to indicator lights, buzzers or PLC monitoring systems
6. Original Schneider Craft & Safe Material
- High-purity copper plug pins, low resistance, stable heat dissipation, long service life
- Flame-retardant anti-aging engineering plastic housing, anti-interference internal circuit
- Plug-and-play structure, no extra installation brackets needed, save cabinet layout space
7. Authoritative Standard Certification
3. Working Conditions
- Ambient operating temperature: -20℃ ~ +55℃
- Protection grade: IP20, only installed inside indoor control distribution cabinets, not suitable for outdoor exposed, splash water environments
- Surrounding atmosphere: Free of corrosive gas, flammable dust and conductive particles
- Altitude: Stable normal performance below 2000 meters above sea level
- Vibration resistance: Tolerate regular mechanical vibration of production workshops, avoid continuous strong impact
- Humidity: Relative humidity ≤85%, no condensation on the relay surface
4. Unified General Technical Specifications
| Parameter | Unified Specification for All LRD Series |
|---|---|
| Matching Contactor | LC1D09 ~ LC1D65 3P AC contactors |
| Adjustable Current Range | 0.1A ~ 65A (multiple sub-models optional) |
| Protection Principle | Bimetallic thermal induction + temperature compensation |
| Core Protection Functions | Overload / Phase Loss / Three-phase Current Unbalance |
| Reset Mode | Switchable Manual Reset / Auto Reset |
| Auxiliary Contacts | 1 Normally Open (97-98) + 1 Normally Closed (95-96) |
| Conductive Terminal Material | High-purity solid copper plug pins |
| Compliance Standards | IEC60947-4-1, GB14048.4 |
| Housing Material | Flame-retardant anti-aging engineering plastic |
| Mounting Method | Direct plug-in matched with LC1D contactor |
5. Typical Applications
- CNC machine tools, textile machinery, printing automated production lines
- Fan, water pump, air conditioner, refrigeration compressor control panels
- Lifting equipment, conveying machinery, agricultural irrigation motors
- Factory workshop power distribution cabinets, building HVAC systems
- Small medium industrial three-phase motor start-stop control units
- Solar equipment, charging station auxiliary motor protection circuits
6. Frequently Asked Questions (FAQ)
1. What LC1D contactor does each LRD model match?
- LRD06 ~ LRD16: Matches LC1D09 / LC1D12 / LC1D18
- LRD21 ~ LRD32: Matches LC1D25 / LC1D32
- LRD40 ~ LRD65: Matches LC1D40 / LC1D50 / LC1D65
2. What is the function of temperature compensation?
3. How to switch between manual and auto reset?
4. Can this relay protect motors against single-phase loss?
5. How to select the correct LRD current model for my motor?
6. Can the LRD thermal relay work alone without a contactor?
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 LRD series thermal overload relay is an official matched protection component for LC1D three-phase AC contactors, designed to provide all-round safety protection for asynchronous three-phase motors. The full series covers an ultra-wide adjustable current range of 0.1A to 65A, with multiple sub-models to match small low-power to medium-large industrial motors.
Manufactured under strict Schneider original standards and compliant with IEC60947-4-1 international & GB14048.4 national standards, this relay adopts bimetallic thermal induction principle with built-in temperature compensation module. It supports phase loss anti-burn protection, switchable manual/automatic reset, visible trip action indicator and standard 1NO+1NC signal contacts. Plug-in modular design enables direct quick assembly on corresponding LC1D contactors, widely applied in machine tools, HVAC, water pumps, compressors and automated production lines.
2. Core Product Features
1. Full Wide Current Range (0.1A ~ 65A)
2. Built-in Phase Loss Protection
3. Professional Temperature Compensation Design
4. Dual Reset Modes with Visible Action Indicator
- Manual Reset: Red STOP button, lock after tripping, manual reset required, ideal for manned high-safety equipment
- Auto Reset: Blue RESET toggle switch to switch mode, auto reset after cooling down for unattended circulating equipment
- Transparent window trip indicator clearly shows overload trip status at a glance
5. Standard 1NO + 1NC Auxiliary Contacts
- 95-96 NC contact: Series into contactor coil circuit to cut off motor power during overload fault
- 97-98 NO contact: Output fault alarm signal to indicator lights, buzzers or PLC monitoring systems
6. Original Schneider Craft & Safe Material
- High-purity copper plug pins, low resistance, stable heat dissipation, long service life
- Flame-retardant anti-aging engineering plastic housing, anti-interference internal circuit
- Plug-and-play structure, no extra installation brackets needed, save cabinet layout space
7. Authoritative Standard Certification
3. Working Conditions
- Ambient operating temperature: -20℃ ~ +55℃
- Protection grade: IP20, only installed inside indoor control distribution cabinets, not suitable for outdoor exposed, splash water environments
- Surrounding atmosphere: Free of corrosive gas, flammable dust and conductive particles
- Altitude: Stable normal performance below 2000 meters above sea level
- Vibration resistance: Tolerate regular mechanical vibration of production workshops, avoid continuous strong impact
- Humidity: Relative humidity ≤85%, no condensation on the relay surface
4. Unified General Technical Specifications
| Parameter | Unified Specification for All LRD Series |
|---|---|
| Matching Contactor | LC1D09 ~ LC1D65 3P AC contactors |
| Adjustable Current Range | 0.1A ~ 65A (multiple sub-models optional) |
| Protection Principle | Bimetallic thermal induction + temperature compensation |
| Core Protection Functions | Overload / Phase Loss / Three-phase Current Unbalance |
| Reset Mode | Switchable Manual Reset / Auto Reset |
| Auxiliary Contacts | 1 Normally Open (97-98) + 1 Normally Closed (95-96) |
| Conductive Terminal Material | High-purity solid copper plug pins |
| Compliance Standards | IEC60947-4-1, GB14048.4 |
| Housing Material | Flame-retardant anti-aging engineering plastic |
| Mounting Method | Direct plug-in matched with LC1D contactor |
5. Typical Applications
- CNC machine tools, textile machinery, printing automated production lines
- Fan, water pump, air conditioner, refrigeration compressor control panels
- Lifting equipment, conveying machinery, agricultural irrigation motors
- Factory workshop power distribution cabinets, building HVAC systems
- Small medium industrial three-phase motor start-stop control units
- Solar equipment, charging station auxiliary motor protection circuits
6. Frequently Asked Questions (FAQ)
1. What LC1D contactor does each LRD model match?
- LRD06 ~ LRD16: Matches LC1D09 / LC1D12 / LC1D18
- LRD21 ~ LRD32: Matches LC1D25 / LC1D32
- LRD40 ~ LRD65: Matches LC1D40 / LC1D50 / LC1D65
2. What is the function of temperature compensation?
3. How to switch between manual and auto reset?
4. Can this relay protect motors against single-phase loss?
5. How to select the correct LRD current model for my motor?
6. Can the LRD thermal relay work alone without a contactor?
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.
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