JR36 Series Thermal Overload Relay | JR36-20/63/160A Motor Protection Relay
JR36 Series Thermal Overload Relay | JR36-20/63/160A Motor Protection Relay
The JR36 series thermal overload relay is a cost-effective bimetallic motor protection device available in JR36-20, JR36-63 and JR36-160A full current ranges. It features built-in temperature compensation, switchable manual & automatic reset modes, and standard 1NO+1NC auxiliary contacts. Designed for fixed base mounting, it provides reliable overload protection for three-phase asynchronous motors, widely used in pump, fan, machine tool and automation control circuits with 3-year quality warranty.
The JR36 series thermal overload relay is a cost-effective bimetallic motor protection device available in JR36-20, JR36-63 and JR36-160A full current ranges. It features built-in temperature compensation, switchable manual & automatic reset modes, and standard 1NO+1NC auxiliary contacts. Designed for fixed base mounting, it provides reliable overload protection for three-phase asynchronous motors, widely used in pump, fan, machine tool and automation control circuits with 3-year quality warranty.
1. Product Overview
The JR36 series thermal overload relay is a classic industrial motor overload protector based on bimetallic thermal induction principle, covering three mainstream models: JR36-20, JR36-63 and JR36-160A to match low, medium and high power three-phase motors.
Equipped with temperature compensation structure, dual manual/auto reset function and overload trip protection, it cuts off motor power timely when overload occurs to avoid winding burnout. Adopting sturdy bakelite insulated housing and reinforced screw wiring terminals, it uses fixed base installation design compatible with most AC contactors. Direct factory supply with complete specifications and 3-year free replacement warranty for quality issues, ideal for general machinery, HVAC, water pumps and manufacturing equipment motor control panels.
2. Core Product Features
1. Complete Full Range Sizes (20A / 63A / 160A Models)
- JR36-20: Small size, adjustable low current range for small power motors
- JR36-63: Medium size, mainstream current range for most general industrial equipment
- JR36-160: Large size, high current capacity for heavy-duty industrial motors
All models share unified functional structure with segmented adjustable current dials for precise calibration.
2. Built-in Temperature Compensation Design
3. Switchable Manual & Automatic Dual Reset Modes
- Manual Reset: Red reset button locks after tripping, requires manual recovery, fits manned high-safety equipment
- Auto Reset: Automatically resets after internal bimetallic strip cools down, suitable for unattended circulating equipment
Easy side toggle switch for fast mode switching without disassembly.
4. Reliable Overload Trip Protection
5. Sturdy Bakelite Housing & Reinforced Wiring Terminals
- High temperature resistant flame-retardant bakelite shell, anti-aging and insulation safe
- Large screw clamping terminals firmly lock wires, prevent loose contact and overheating under long vibration
- Separated main circuit and auxiliary contact chambers to isolate electric arc interference
6. Standard 1NO + 1NC Auxiliary Contacts
- 95/96 Normally Closed contact: Series into contactor coil to cut motor power after overload trip
- 97/98 Normally Open contact: Output fault alarm signal for indicator light, buzzer or PLC monitoring
Clear terminal marking for fast and error-free wiring.
7. Factory Direct Supply & Long Warranty
3. Working Conditions
- Ambient operating temperature: -20°C ~ +55°C
- Protection grade: IP20, only installed inside indoor closed distribution cabinets, not for outdoor splash/wet environments
- Surrounding atmosphere: Free of corrosive gas, flammable and conductive dust
- Altitude: Normal stable 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 Technical Specifications
| Parameter | Unified Specification for JR36 Series |
|---|---|
| Model Options | JR36-20 / JR36-63 / JR36-160A |
| Protection Principle | Bimetallic thermal induction with temperature compensation |
| Core Functions | Overload protection, manual/auto reset switchable |
| Auxiliary Contacts | 1NO (97-98) + 1NC (95-96) |
| Housing Material | High flame-retardant bakelite plastic |
| Installation Method | Fixed base surface mounting (match various AC contactors) |
| Terminal Type | Large screw fixed wiring terminals |
| Warranty | 3-year free replacement for quality defects |
| Applicable Load | Three-phase asynchronous AC motors |
5. Typical Applications
- Industrial three-phase fans, water pumps, compressors and refrigeration equipment
- CNC machine tools, textile, printing and automated production lines
- Lifting machinery, conveying equipment and agricultural irrigation motors
- Factory workshop power distribution cabinets and building HVAC control panels
- Small and medium manufacturing equipment motor start-stop control systems
6. Frequently Asked Questions (FAQ)
1. What is the difference between JR36-20, JR36-63 and JR36-160A?
2. What’s the advantage of temperature compensation?
3. How to switch manual and auto reset mode?
4. Can JR36 thermal relay realize phase loss protection?
5. What installation way does JR36 adopt?
6. What does the 3-year warranty cover?
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 JR36 series thermal overload relay is a classic industrial motor overload protector based on bimetallic thermal induction principle, covering three mainstream models: JR36-20, JR36-63 and JR36-160A to match low, medium and high power three-phase motors.
Equipped with temperature compensation structure, dual manual/auto reset function and overload trip protection, it cuts off motor power timely when overload occurs to avoid winding burnout. Adopting sturdy bakelite insulated housing and reinforced screw wiring terminals, it uses fixed base installation design compatible with most AC contactors. Direct factory supply with complete specifications and 3-year free replacement warranty for quality issues, ideal for general machinery, HVAC, water pumps and manufacturing equipment motor control panels.
2. Core Product Features
1. Complete Full Range Sizes (20A / 63A / 160A Models)
- JR36-20: Small size, adjustable low current range for small power motors
- JR36-63: Medium size, mainstream current range for most general industrial equipment
- JR36-160: Large size, high current capacity for heavy-duty industrial motors
All models share unified functional structure with segmented adjustable current dials for precise calibration.
2. Built-in Temperature Compensation Design
3. Switchable Manual & Automatic Dual Reset Modes
- Manual Reset: Red reset button locks after tripping, requires manual recovery, fits manned high-safety equipment
- Auto Reset: Automatically resets after internal bimetallic strip cools down, suitable for unattended circulating equipment
Easy side toggle switch for fast mode switching without disassembly.
4. Reliable Overload Trip Protection
5. Sturdy Bakelite Housing & Reinforced Wiring Terminals
- High temperature resistant flame-retardant bakelite shell, anti-aging and insulation safe
- Large screw clamping terminals firmly lock wires, prevent loose contact and overheating under long vibration
- Separated main circuit and auxiliary contact chambers to isolate electric arc interference
6. Standard 1NO + 1NC Auxiliary Contacts
- 95/96 Normally Closed contact: Series into contactor coil to cut motor power after overload trip
- 97/98 Normally Open contact: Output fault alarm signal for indicator light, buzzer or PLC monitoring
Clear terminal marking for fast and error-free wiring.
7. Factory Direct Supply & Long Warranty
3. Working Conditions
- Ambient operating temperature: -20°C ~ +55°C
- Protection grade: IP20, only installed inside indoor closed distribution cabinets, not for outdoor splash/wet environments
- Surrounding atmosphere: Free of corrosive gas, flammable and conductive dust
- Altitude: Normal stable 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 Technical Specifications
| Parameter | Unified Specification for JR36 Series |
|---|---|
| Model Options | JR36-20 / JR36-63 / JR36-160A |
| Protection Principle | Bimetallic thermal induction with temperature compensation |
| Core Functions | Overload protection, manual/auto reset switchable |
| Auxiliary Contacts | 1NO (97-98) + 1NC (95-96) |
| Housing Material | High flame-retardant bakelite plastic |
| Installation Method | Fixed base surface mounting (match various AC contactors) |
| Terminal Type | Large screw fixed wiring terminals |
| Warranty | 3-year free replacement for quality defects |
| Applicable Load | Three-phase asynchronous AC motors |
5. Typical Applications
- Industrial three-phase fans, water pumps, compressors and refrigeration equipment
- CNC machine tools, textile, printing and automated production lines
- Lifting machinery, conveying equipment and agricultural irrigation motors
- Factory workshop power distribution cabinets and building HVAC control panels
- Small and medium manufacturing equipment motor start-stop control systems
6. Frequently Asked Questions (FAQ)
1. What is the difference between JR36-20, JR36-63 and JR36-160A?
2. What’s the advantage of temperature compensation?
3. How to switch manual and auto reset mode?
4. Can JR36 thermal relay realize phase loss protection?
5. What installation way does JR36 adopt?
6. What does the 3-year warranty cover?
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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