- Product information
- Focusens Solution
- Typical Application
- Technical Specifications & Selection Guide
- How Do We Control Quality?
- Are You Facing Any of These Temperature Sensor Problems?
- Why Choose Our PTC Thermistor Protection Sensor?
- Frequently Asked Questions
- Purchase history
- Customer Reviews
- Buyers Q & A
Model：MZ6 Series
Key Feature：Overheat Protection
MOQ(Standard)：500 pcs
MOQ(Customized)：TBD
Fucusens Solution
A Temperature Protection Component Designed Around a Defined Control Point.Unlike a conventional temperature sensor mainly used to continuously measure temperature, a PTC thermistor protection sensor is designed around a defined Rated Control Temperature - TK. As the temperature approaches and exceeds the specified TK range, the resistance rises significantly, allowing the control or protection circuit to identify an over-temperature condition.
Our Capability | What It Solves | Value to Your Business |
TK from 60°C to 180°C | Different equipment has different protection temperatures | Match the required over-temperature threshold |
Single PTC thermistor | One temperature monitoring point | Simple protection configuration |
Double / Triple PTC thermistors | Multiple winding or device monitoring points | Better multi-point protection |
Multiple thermistors connected in series | Several critical points need to be monitored together | One protection circuit can monitor multiple positions |
Fast response ≤5s | Slow thermal protection response | Faster detection of abnormal heating |
TK tolerance ±5°C | Protection temperature must stay within a defined range | More predictable switching behavior |
TK reproducibility ±0.5°C | Repeatability is important for protection systems | Consistent thermal response |
Custom wire length | Standard wire does not fit equipment | Easier motor and machine integration |
Wire color coding by TK | Different control temperatures are difficult to identify | Easier production and assembly identification |
Typical Applications
Application | Typical Customer | Recommended Solution | Why This Configuration |
Motor Winding Over-Temperature Protection | Motor and drive manufacturers | Triple PTC thermistor sensor with specified TK | Multiple PTC elements can monitor critical winding points and provide a defined over-temperature signal |
Three-Phase Motor Protection | Industrial motor manufacturers | Triple PTC sensing assembly | Suitable for monitoring multiple winding locations in three-phase motors |
Power Device Thermal Protection | Power electronics and electrical equipment manufacturers | Single or multiple PTC temperature sensors | Provides a defined resistance change when the monitored device reaches the selected temperature |
Industrial Machine Temperature Protection | Machinery and automation equipment manufacturers | Customized PTC thermistor assembly | TK and sensing-point quantity can be matched to equipment requirements |
Transformer / Coil Temperature Protection | Electrical equipment manufacturers | Single / multiple PTC thermistor sensor | Compact thermistor elements support winding and coil over-temperature monitoring |
Custom Multi-Point Temperature Protection | OEM industrial equipment manufacturers | Series-connected PTC thermistor assembly | Multiple sensing elements can protect several critical temperature points |
Technical Specifications & Selection Guide
Parameter | Specification | Selection Notes |
Product Type | PTC Thermistor Temperature Protection Sensor | For temperature monitoring and protection |
Sensing Element | PTC Thermistor | Positive temperature coefficient element |
Rated Control Temperature TK | 60°C to 180°C | Selected according to protection requirement |
TK Tolerance | ±5°C | According to supplied technical data |
TK Reproducibility | ±0.5°C | According to supplied technical data |
Maximum Working Voltage | 25VDC | Electrical specification |
Thermal Response Time | Ta ≤5s | Fast thermal response |
Electrical Insulation Strength | AC 2.5kV | Insulation specification |
Maximum Controlled Temperature | 180°C | According to technical data |
Storage Temperature | -40°C to +180°C | According to technical data |
Element Configuration | Single / Double / Triple / Sextuple | According to monitoring points |
Wire Length | Standard / Customized | According to equipment design |
Multi-Point Monitoring | PTC elements can be connected in series | Suitable for multiple temperature points |
Product Structure & Selection Guide
Selection Item | What to Confirm | Why It Matters |
Rated Control Temperature TK | Required switching / protection temperature | Core PTC selection parameter |
Number of PTC Elements | Single / Double / Triple / Sextuple | Determines number of monitoring points |
Motor / Equipment Type | Motor winding / power device / machine | Determines application configuration |
Maximum Temperature | Actual operating and fault temperature | Confirms sensor suitability |
Protection Circuit | Controller / relay interface | Ensures electrical compatibility |
Wire Length | Standard / custom | Matches installation |
Installation Position | Winding / device / internal component | Determines sensor arrangement |
Wire Color Identification | Required TK identification | Simplifies production assembly |
3 Common Mistakes When Selecting a Pipe-Mounted NTC Sensor
Common Mistake | Why It Causes Problems | Better Approach |
The higher the TK, the better. | A protection temperature that is too high may allow the motor or component to operate beyond the intended safe temperature. | Select TK according to the equipment's real temperature limit. |
One PTC sensor is enough for every motor. | Multi-phase motors or large windings may develop different temperatures at different points. | Select single, triple or multiple PTC elements according to the protection points. |
PTC and NTC temperature sensors work the same way. | Their resistance-temperature behavior and typical control applications are different. | Select PTC when a defined over-temperature protection characteristic is required. |
A Temperature Protection Component Designed Around a Defined Control Point.Unlike a conventional temperature sensor mainly used to continuously measure temperature, a PTC thermistor protection sensor is designed around a defined Rated Control Temperature - TK. As the temperature approaches and exceeds the specified TK range, the resistance rises significantly, allowing the control or protection circuit to identify an over-temperature condition.
Our Capability | What It Solves | Value to Your Business |
TK from 60°C to 180°C | Different equipment has different protection temperatures | Match the required over-temperature threshold |
Single PTC thermistor | One temperature monitoring point | Simple protection configuration |
Double / Triple PTC thermistors | Multiple winding or device monitoring points | Better multi-point protection |
Multiple thermistors connected in series | Several critical points need to be monitored together | One protection circuit can monitor multiple positions |
Fast response ≤5s | Slow thermal protection response | Faster detection of abnormal heating |
TK tolerance ±5°C | Protection temperature must stay within a defined range | More predictable switching behavior |
TK reproducibility ±0.5°C | Repeatability is important for protection systems | Consistent thermal response |
Custom wire length | Standard wire does not fit equipment | Easier motor and machine integration |
Wire color coding by TK | Different control temperatures are difficult to identify | Easier production and assembly identification |
Application | Typical Customer | Recommended Solution | Why This Configuration |
Motor Winding Over-Temperature Protection | Motor and drive manufacturers | Triple PTC thermistor sensor with specified TK | Multiple PTC elements can monitor critical winding points and provide a defined over-temperature signal |
Three-Phase Motor Protection | Industrial motor manufacturers | Triple PTC sensing assembly | Suitable for monitoring multiple winding locations in three-phase motors |
Power Device Thermal Protection | Power electronics and electrical equipment manufacturers | Single or multiple PTC temperature sensors | Provides a defined resistance change when the monitored device reaches the selected temperature |
Industrial Machine Temperature Protection | Machinery and automation equipment manufacturers | Customized PTC thermistor assembly | TK and sensing-point quantity can be matched to equipment requirements |
Transformer / Coil Temperature Protection | Electrical equipment manufacturers | Single / multiple PTC thermistor sensor | Compact thermistor elements support winding and coil over-temperature monitoring |
Custom Multi-Point Temperature Protection | OEM industrial equipment manufacturers | Series-connected PTC thermistor assembly | Multiple sensing elements can protect several critical temperature points |
Technical Data
Parameter | Specification | Selection Notes |
Product Type | PTC Thermistor Temperature Protection Sensor | For temperature monitoring and protection |
Sensing Element | PTC Thermistor | Positive temperature coefficient element |
Rated Control Temperature TK | 60°C to 180°C | Selected according to protection requirement |
TK Tolerance | ±5°C | According to supplied technical data |
TK Reproducibility | ±0.5°C | According to supplied technical data |
Maximum Working Voltage | 25VDC | Electrical specification |
Thermal Response Time | Ta ≤5s | Fast thermal response |
Electrical Insulation Strength | AC 2.5kV | Insulation specification |
Maximum Controlled Temperature | 180°C | According to technical data |
Storage Temperature | -40°C to +180°C | According to technical data |
Element Configuration | Single / Double / Triple / Sextuple | According to monitoring points |
Wire Length | Standard / Customized | According to equipment design |
Multi-Point Monitoring | PTC elements can be connected in series | Suitable for multiple temperature points |
PTC Resistance Characteristics Around TK
The rated control temperature TK is the key selection parameter. The PTC resistance remains relatively low below TK and increases significantly as the temperature rises above TK.
Single PTC Thermistor
Temperature Point | Resistance Requirement |
25°C | ≤100Ω |
TK - 5°C | ≤550Ω |
TK + 5°C | ≥1330Ω |
TK + 15°C | ≥4kΩ |
Triple PTC Thermistor
Temperature Point | Resistance Requirement |
25°C | ≤300Ω |
TK - 5°C | ≤1600Ω |
TK + 5°C | ≥4000Ω |
TK + 15°C | ≥12kΩ |
Available Rated Control Temperatures
60°C / 70°C / 80°C / 90°C / 100°C / 105°C / 110°C / 115°C / 120°C / 125°C / 130°C / 135°C / 140°C / 145°C / 150°C / 155°C / 160°C / 170°C / 180°C
These TK options can be selected according to motor insulation system, winding temperature limit, equipment design, power device operating temperature and protection-circuit requirement.
Available PTC Configurations
Configuration | Description | Typical Use |
Single Thermistor | One PTC sensing element | Single temperature monitoring point |
Double Thermistor | Two PTC elements | Two monitoring positions |
Triple Thermistor | Three PTC elements | Three-phase motor / multiple winding points |
Sextuple Thermistor | Six PTC elements | Multiple critical temperature points |
Ordering Guide
Ordering structure: Product Series + Specified TK + Number of Sensing Elements + Wire Length Type
Code | Configuration |
E | Single Thermistor |
Z | Double Thermistor |
D | Triple Thermistor |
S | Sextuple Thermistor |
Code | Description |
S | Standard Wire Length |
K | Custom-Designed Wire Length |
Wire Color Code by Rated Control Temperature
TK | Wire 1 | Wire 2 |
60°C | White | Gray |
70°C | White | Brown |
80°C | White | White |
90°C | Green | Green |
100°C | Red | Red |
105°C | Blue | Gray |
110°C | Brown | Brown |
115°C | Blue | Green |
120°C | Gray | Gray |
125°C | Red | Green |
130°C | Blue | Blue |
135°C | Red | Black |
140°C | White | Blue |
145°C | White | Black |
150°C | Black | Black |
155°C | Blue | Black |
160°C | Blue | Red |
170°C | White | Green |
180°C | White | Red |
Sensor Construction & Selection Guide
Selection Item | What to Confirm | Why It Matters |
Rated Control Temperature TK | Required switching / protection temperature | Core PTC selection parameter |
Number of PTC Elements | Single / Double / Triple / Sextuple | Determines number of monitoring points |
Motor / Equipment Type | Motor winding / power device / machine | Determines application configuration |
Maximum Temperature | Actual operating and fault temperature | Confirms sensor suitability |
Protection Circuit | Controller / relay interface | Ensures electrical compatibility |
Wire Length | Standard / custom | Matches installation |
Installation Position | Winding / device / internal component | Determines sensor arrangement |
Wire Color Identification | Required TK identification | Simplifies production assembly |
3 Common Mistakes When Selecting a Clamp-Mount NTC Sensor
Common Mistake | Why It Causes Problems | Better Approach |
The higher the TK, the better. | A protection temperature that is too high may allow the motor or component to operate beyond the intended safe temperature. | Select TK according to the equipment's real temperature limit. |
One PTC sensor is enough for every motor. | Multi-phase motors or large windings may develop different temperatures at different points. | Select single, triple or multiple PTC elements according to the protection points. |
PTC and NTC temperature sensors work the same way. | Their resistance-temperature behavior and typical control applications are different. | Select PTC when a defined over-temperature protection characteristic is required. |
For a PTC motor protection sensor, the key question is not only the resistance at room temperature, but whether the resistance changes correctly around the required TK temperature. Quality control therefore focuses on Rated Control Temperature + Resistance Characteristics + Reproducibility + Electrical Insulation + Lead Connection.
Incoming Material Inspection
· Lead wires inspected according to product requirements
· Insulation materials verified before production
· PTC components grouped according to required temperature specification
Process Control
· Single / multiple PTC configurations assembled according to specification
· Lead wire length checked during production
· Temperature identification and color coding verified
· Electrical insulation structure controlled during assembly
Finished Product Inspection
Test Item | Single PTC | Triple PTC | Purpose |
Maximum Working Voltage | 25VDC | 25VDC | Confirm electrical operating limit |
Rated Control Temperature TK | Customer Requirement | Customer Requirement | Match required protection temperature |
TK Tolerance ΔT1 | ±5°C | ±5°C | Control switching-temperature range |
TK Reproducibility ΔT2 | ±0.5°C | ±0.5°C | Verify repeatability |
Resistance at 25°C | ≤100Ω | ≤300Ω | Verify low-temperature resistance |
Resistance at TK-5°C | ≤550Ω | ≤1600Ω | Verify pre-switch resistance |
Resistance at TK+5°C | ≥1330Ω | ≥4000Ω | Verify resistance rise around TK |
Resistance at TK+15°C | ≥4kΩ | ≥12kΩ | Verify high-temperature resistance |
Thermal Response Time Ta | ≤5s | ≤5s | Verify thermal response |
Electrical Insulation Strength Uis | AC 2.5kV | AC 2.5kV | Verify insulation |
Maximum Controlled Temperature | 180°C | 180°C | Confirm upper temperature specification |
Maximum Storage Temperature | 180°C | 180°C | Confirm storage limit |
Minimum Storage Temperature | -40°C | -40°C | Confirm storage limit |
If You Are an Equipment Manufacturer / OEM
Common Problem | What It Means for Your Business |
The motor overheats before the protection system reacts | Slow or poorly positioned temperature protection can allow excessive winding temperature. |
The protection temperature is not matched to the motor | An incorrect TK may trigger too early or too late. |
One sensing point cannot represent the entire winding | Different winding locations may reach different temperatures. |
Temperature protection is not repeatable enough | Inconsistent switching behavior can affect equipment protection. |
The sensor is difficult to install inside the winding | Bulky protection components complicate motor assembly. |
Standard wire length does not fit the motor | Additional wire modification increases production work. |
Different motor models require different TK values | One standard thermistor cannot cover the complete product range. |
If You Are a Distributor / Importer
Common Problem | What It Means for Your Business |
Customers require many different TK temperatures | Different motors and equipment use different protection limits. |
Customers need single, triple and multiple configurations | One standard sensor configuration cannot cover every project. |
Technical matching takes too long | TK, element quantity and wiring must all be confirmed. |
Customers need repeatable protection characteristics | Inconsistent thermistor performance leads to quality complaints. |
Wire length requirements vary by customer | Fixed cable configurations limit OEM projects. |
Customers want a finished protection assembly | Additional customer fabrication reduces product convenience. |
Sample Support
Item | Support |
Standard TK Sample | According to available specification and stock |
Customized TK | According to customer temperature requirement |
Element Quantity | Single / Double / Triple / Sextuple |
Wire Length | Standard / Customized |
Application Support | Motor winding and equipment protection selection |
Identification | TK wire color coding according to specification |
Sample Validation Before Mass Production
Item | Our Approach |
Rated Control Temperature | According to confirmed TK |
TK Tolerance | According to specification |
Resistance Characteristics | Checked around TK |
PTC Quantity | According to confirmed configuration |
Wire Length | According to standard or custom requirement |
Electrical Insulation | According to technical specification |
Customized Product | Specification confirmed before production |
Quality Issues | Technical analysis and corrective solution |
MOQ & Lead Time
Item | Details |
Standard Product MOQ | Contact us for current MOQ |
Customized Product MOQ | Depends on TK and configuration requirements |
Standard Lead Time | Contact us for current production schedule |
Customized Lead Time | Depends on TK, element quantity and wire requirements |
Sample Lead Time | Confirmed after specification review |
About Us
Capability | Details |
Main Products | PTC Thermistors, NTC Temperature Sensors, RTD Sensors and Custom Temperature Sensing Assemblies |
PTC Capability | 60°C to 180°C rated control temperatures |
Configurations | Single / Double / Triple / Multiple PTC sensing elements |
Temperature Selection | TK according to customer requirement |
Wire Customization | Standard and custom wire length |
Application Support | Motor, winding, power device and machine protection |
OEM / ODM | Custom assemblies according to application and specification |
Q1: What is a PTC thermistor motor protection sensor?
It is a positive temperature coefficient thermistor used to monitor the temperature of motor windings, power devices or machines. Its resistance increases significantly around the specified rated control temperature TK.
Q2: What TK temperatures are available?
Rated control temperatures are available from 60°C to 180°C with multiple specified temperature options.
Q3: What does TK mean?
TK is the Rated Control Temperature. It is the key temperature around which the PTC resistance changes significantly and the protection circuit can detect an over-temperature condition.
Q4: What is the tolerance of TK?
The specified rated control temperature tolerance is ±5°C.
Q5: What is the reproducibility of TK?
According to the supplied technical data: ±0.5°C.
Q6: How fast does the PTC respond?
The specified thermal response time is Ta ≤5 seconds.
Q7: Can I use three PTC thermistors for a three-phase motor?
The supplied product supports a triple thermistor configuration. This can be used where three sensing points are required. The final installation should be determined according to the motor design.
Q8: Can multiple PTC thermistors be connected in series?
Yes. The supplied product information states that PTC thermistor beads with different rated response temperatures can be connected in series.
Q9: What configurations are available?
Single / Double / Triple / Sextuple thermistor configurations.
Q10: Can wire length be customized?
Yes. Standard Wire Length and Custom-Designed Wire Length are available.
Q11: What is the maximum working voltage?
25VDC.
Q12: What is the insulation strength?
AC 2.5kV.
Q13: What information do you need for a quotation?
Application + Required TK + Number of PTC Elements + Wire Length + Quantity. If you already use a PTC protection sensor, send us the existing specification or sample information.
- User name Member Level Quantity Specification Purchase Date
- Satisfaction ：
-
Expert for Thermistors Temperature Sensors Humidity Sensors Level Sensors ; Reliable but flexible custom products development
100+ Sensing Solutions Developed Annually for Different Applications
80+ Countries Customers Serviced
