Motor windings
Locate the sensing point where the winding design requires protection.
GUILCOR · PTC sensing and selection
PTC130
Plan the thermal threshold.
A nominal threshold is only the start of a protection design. Include tolerance, heat transfer and controller behaviour when selecting a 130 °C PTC.
Loading 3D model…
Sensor selection
Understand PTC130.
130 °CNominal threshold designation to confirm
Switching PTCSteep transition used for detection
Sensor + relaySpecify the complete protection chain
This category covers the PTC130 designation used for threshold-temperature applications. It does not identify one universal manufacturer curve. Confirm the full part number, nominal response temperature and resistance limits before specifying the element.
Selection context
Separate the sensing element from the trip function.
A leaded disc illustrates one PTC construction. The selected part and its monitoring circuit together define the application; appearance alone does not establish a switching threshold.
Characteristic and construction
The reference details that matter.
A switching PTC produces a strong resistance increase near its transition region. The associated monitoring circuit detects a resistance threshold; the sensor is not a mechanical contact. TDK’s M1100 documentation provides an example of a 130 °C motor-protection element, but does not establish the specifications of every product called PTC130.
Reference documents: TDK M1100: example of specified motor-protection characteristics. Confirm the documentation for the supplied part.
| Response temperature | Confirm the 130 °C designation on the selected datasheet |
|---|---|
| Cold resistance | Obtain specified limits and test conditions |
| Transition region | Use manufacturer resistance limits, not an invented exponential curve |
| Monitoring unit | Verify trip/reset levels and permitted sensor voltage |
A practical application check
Map the temperature margin.
Tool input range: -40 to 250
Tool input range: -39 to 300
Tool input range: 0 to 30
Tool input range: 0 to 100
Compare a 130 °C nominal selection with the normal operating temperature and the application’s temperature limit. Enter an assumed threshold allowance and an additional temperature rise for response delay.
Margin above normal operation
Margin below application limit
Enable JavaScript to calculate.
Planning assumptions only: the allowance is not a guaranteed PTC130 tolerance. This is not a trip-temperature prediction or a protection certification.
Calculation or decision ruleNormal margin = 130 − allowance − Tnormal; limit margin = Tlimit − (130 + allowance + additional rise)
A positive result leaves room under the entered assumptions. Validate the actual sensor position, relay response, shutdown path and temperature rise after power removal before assigning a protection function.
Wiring and self-heating
Connect the circuit and control the heat.
Connect the identified reference
For a specified two-terminal sensing PTC, connect to a compatible thermistor monitoring input. Where a series chain is permitted, the monitoring unit sees the sum of all sensor and lead resistances. Follow the selected relay’s connection and test instructions.
Confirmed sensing element → compatible monitor → specified output function
Control self-heating and installation effects
Sensing current must respect the sensor and monitoring-unit limits. Excessive measuring power can alter the sensing condition. A motor-starting or heating PTC deliberately operates with a different thermal and electrical regime; do not transfer its ratings or test method to a sensing loop.
Mechanical contact, insulation, sheath mass and nearby heat sources influence the temperature followed by the element. Evaluate the finished assembly in the intended medium and mounting.
Operating principle
Match the principle to the application.
How the signal is used
For a specified switching PTC sensing element, the monitoring circuit evaluates resistance rather than receiving a mechanical contact. A steep transition can signal an overtemperature condition. The actual trip behaviour depends on the selected element, monitor and thermal installation, not simply on the category name.
Strengths and selection limits
A steep transition is useful for threshold detection but is unsuitable for assuming a precise temperature throughout the cold region. The motor or transformer may continue heating after a trip, so sensor placement and shutdown delay are as relevant as the nominal response temperature.
Application contexts
Where to evaluate PTC130.
Transformers and coils
Check impregnation compatibility and electrical isolation.
Heated assemblies
Relate the trip function to the maximum permitted component temperature.
Engineering example
Relate a specified threshold to the monitoring circuit.
As a manufacturer-specific example, TDK B59100M1130A070 has a nominal sensing temperature of 130 °C. Its reference limits illustrate the transition region; they must not be assigned automatically to an unidentified PTC130.
| Example test temperature | Specified resistance limit | Test-voltage condition |
|---|---|---|
| 125 °C | ≤ 550 Ω | ≤ 2.5 V |
| 135 °C | ≥ 1330 Ω | ≤ 2.5 V |
| 145 °C | ≥ 4000 Ω | ≤ 7.5 V |
TDK M1100 example: use the exact ordering code and test conditions
Why nominal sensing temperature is not the final trip temperature
The relay responds to its input resistance. Sensor tolerance, the sum of a series chain and lead resistance influence when that electrical threshold is reached. Heat transfer to the sensor and the shutdown delay add further differences between the measured location and the protected hot spot.
For the planning example with normal operation at 105 °C, a 130 °C nominal threshold, an assumed ±5 °C allowance and a further 10 °C rise during response, the margin above normal operation is 20 °C. If the application limit is 155 °C, the remaining limit margin is 10 °C. These assumed margins are not a tolerance specification or proof of protection.
Functional connection
Confirmed sensing PTC chain → compatible thermistor monitoring input → specified shutdown command. Define the response to a disconnected or shorted loop and the required reset policy. The sensor does not directly switch the motor supply.
Before requesting a reference
Specify the complete assembly.
Electrical and thermal information
- Manufacturer, complete part number and source document.
- Required measurement range or response temperature.
- Curve and tolerance, or resistance limits around the switching region.
- Controller reference, measuring conditions and required accuracy or detection behaviour.
- Response requirement in the actual medium and installation.
Mechanical and project information
- Mounting position, dimensions, sheath or board layout.
- Cable, connector, pin assignment and electrical insulation.
- Media, vibration, moisture and temperature exposure.
- Calibration or functional test requirements for the final assembly.
- Expected quantity, traceability and replacement constraints.
Probe construction
Choose the installation format.
Explore the probe constructions below, then confirm feasibility for the selected element. A construction link does not imply that every PTC reference is available in that format.
Frequently asked questions
PTC130 questions.
Can PTC130 provide an accurate temperature display?
A switching PTC is generally selected for a threshold function. Use a documented measurement sensor and curve when a continuous temperature display is required.
Does the bare-element rating apply to the whole probe?
No. Cable, joints, insulation, sealing and mounting can set a lower limit. Specify and validate the completed assembly.
Can the application check replace a product specification?
No. Each check uses the assumptions shown beside it. Confirm the exact sensor and controller documents and test the finished application.
What should I send to GUILCOR?
Send the full part reference if known, controller details, temperature requirement, installation drawing, cable and connector requirements, and expected quantity.
SELECTION / YOUR APPLICATION
Is PTC130 the right starting point?
Match the reference to the application.
The application calls for a documented PTC temperature threshold. Identify the full PTC130 reference and its specified resistance behaviour first.
Review the specification →Review MZ6 alongside PTC130.
Confirm the intended electrical function first: continuous measurement, temperature protection or another circuit role. Compare the exact manufacturer characteristic and operating conditions.
Explore MZ6 →Keep the complete specification together.
Use the full manufacturer reference and suffix. Confirm the circuit role, resistance characteristic, package and readout or protection circuit before considering a substitute.
Prepare your enquiry →These links support a specification review. They do not establish interchangeable parts or availability of a complete assembly.
More selection details
Compare the sensing principle and exact reference before considering a substitution.
GUILCOR / YOUR ENQUIRY
Define your PTC130 enquiry.
State what the PTC must do in the circuit. The category name alone does not define a measurement curve, a switching threshold or a compatible replacement.
Missing a reference or datasheet?
Send the component marking, equipment reference and any photographs or documents you have. These provide a starting point for identifying what must be confirmed.
The outline helps prepare your enquiry. Copying it does not send a request.
FOUR DETAILS THAT MOVE THE DISCUSSION FORWARD
01
Device and circuit function
Full manufacturer part number and suffix, measurement or protection function, resistance characteristic or response threshold, tolerance and connected circuit.
02
Measurement conditions
Normal and peak temperatures, required measurement or protection behaviour, thermal contact, response needs and reset conditions where applicable.
03
Assembly and connection
Package or sensing assembly, mounting, insulation, lead or cable arrangement, connector and any exposure to vibration, moisture or cleaning.
04
Project and validation
Sample and production quantities, target delivery, calibration or documentation needs, and the checks required before approval.