Temperature sensors for electrical transformers

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Simple PTC probe

PTC thermistor Type K single 500mm
Price 2,56 €
Shipping in 24 / 48h

Double PTC probe

Probes used in the electrical engineering sector for overload protection of electric motor windings ...
Shipping in 24 / 48h

Triple PTC probe

PTC thermistor Type KD triple 500mm
Price 5,30 €
Shipping in 24 / 48h

GUILCOR has been for more than 30 years one of the main French designer and distributor of thermal probes and protectors for dry and oil bath transformers. We guarantee you high quality products at the most competitive prices. The products below are available in stock within 24 to 48 hours. For any questions do not hesitate to contact us at 33-0

Temperature probes with high electrical resistance and mechanical durability for measuring the temperature of the windings and oil of transformers.

Resistance temperature probes encapsulated in a metal tube or in a heat-shrinkable tube. These temperature probes operate in various temperature ranges from -50 ° C to +260 ° C. The most common measuring elements are Pt 100, Pt 1000, Ni 1000, KTY, NTC, PTC etc ... These probes of temperature are most often used to measure the temperature of windings and oil.

Dry transformers

Temperature probes for windings - Temperature probes insulated by a heat-shrinkable tube

Winding and winding probe.png

Cable temperature probes whose sensitive element is protected by a heat shrink. These probes are distinguished by their high electrical resistance and their most common application is the measurement of temperature in the windings.


 - Measuring element: Pt 100, Pt 1000, Ni 1000, NTC, PTC, KTY, or other on request

 - Operating temperature range: temperature class -20 ° C to 180 ° C

 - Connection wires: Teflon FEP or PFA 0,22 mm or on request

 - Electrical resistance: 2.5 kV or higher on request

 - Input protection: IP 20

 - Connection: 2 wires, 3 wires or 4 wires

The parameters and design of the probe can be adjusted on request.

Temperature sensors with protective tube

These temperature probes are distinguished by their high mechanical resistance and their temperature range which can correspond to any type of dry transformer.


 - Detection element: Pt 100, Pt 1000, Ni 1000, NTC, PTC, KTY, other as requested

 - Operating temperature range: temperature class -50 ° C to 250 ° C

 - Connection wires: Teflon APFA

 - Dielectric resistance: 3 kV or on request

 - Protection index: IP 67

 - Connection: 2 wires, 3 wires or 4 wires

The parameters and design of the probe can be adjusted on request.

Bimetallic thermal protectors for transformer winding

Due to their good resistance to pressure, bimetallic switches can be installed on or in the winding of electrical devices. 

Some bimetallic strips have an uninsulated metal case and are energized. They are used in areas that are already sufficiently isolated or where no enclosure insulation is required.

ST01U1 type bimetallic strips are isolated by assembling a Kynar, Mylar (≤ 130 ° C) or Nomex (≥ 135 ° C) heat-shrinkable tubing. The switches have high voltage resistance up to 2 kV at 50Hz AC and 1min. as well as protection class I VDE. They are particularly suitable for installation in windings of transformers and coils.

Oil bath transformer

Standard probes for temperature measurement of oil bath transformers

Resistance temperature sensors with stainless steel tube and connection head. The thermal resistance of the probes is variable according to the needs of the customer. The IP of the sensors can go up to IP 68. The design of the probes depends on the application and can be with smooth metal tube, with thread, temperature sensors with connector etc ... Our temperature probes offer the largest resistance to shock and vibration.

TECSYSTEM innovation: Your sealed transformer will never be alone again!

Innovation, easy, solid and "transparent" installation.

The conventional electromechanical control devices are replaced by the TPL503 electronic sensor, installed directly on the transformer, capable of monitoring the TEMPERATURE, PRESSURE and LEVEL of the oil.

The innovative TPL503 sensor is connected to the machine by a conventional flange.

The sensor data is transmitted via an RS485 serial connection to the NT210 K unit, which can be installed directly on the control panel.

This allows all ALARM, FAN / PUMP parameters to be viewed and controlled remotely.

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