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Description and application


Series KTSB 087/R bimetal temperature switches are designed as two-state controllers (ON/OFF control) that compare the preset and instantaneous temperature and immediately disconnect the contact when a defined temperature is reached. The required temperature of switching is defined according to the customer’s needs by the selection of a bimetal thermal cutoff and cannot be changed.

KTSB 087/R series bimetal switches consist of a stainless steel housing containing a bimetal switch (thermal cutoff) and supply cable.

KTSB 087/R series Bimetal switches are used to signal exceeded temperature in various applications, e.g. to protect transformers, power semiconductor stages, motors and powerful batteries. The bimetal switches KTSB 087/R series are intended for operation in chemically non-aggressive environments.


  • The type tests are carried out by a notified body according to EN 50155 standard, as amended, Railway applications – Electronic equipment used on rolling stock, Art. 12.2.9, 12.2.11

- Insulation test in accordance with EN 50155, as amended

- Shock and vibration tests in accordance with EN 61373, as amended

The product meets parameters in accordance with EN 45545-2, as amended, Fire protection on railway vehicles - Part 2: Requirements for fire behavior of materials and components. The materials also meet requirements of the NFPA 130 fire safety standard, as amended.

  • Manufacturer provides EU Declaration of Conformity.
  • Calibration – The final metrological inspection – comparison with standards or working instruments – is carried out for all the products. Continuity of the standards and working measuring instruments is ensured within the meaning of the Section 5 of Act no.505/1990 on metrology. The manufacturer offers a possibility to supply the sensors calibrated in SENSIT s.r.o.’s laboratory (according to requirements of the EN ISO/IEC 17025 standard, as amended) or in an Accredited laboratory.

  • Specifications
  • Modification
  • Wiring diagram
  • Dimensional draft
  • Download
Sensor type KTSB 087/R
Sensor Bimetal TMC – C1B
Temperature range (selection of the tripping temperature) 70 to 120 °C (in 10 °C steps) * , the measuring range can be extended – see modification
Contact design normally closed / snap action
Maximum switching voltage/current 10.000 cycles 250VAC / 2.5A
3.000 cycles 250VAC / 6.3A
Switching tolerance ± 5°C
Case material stainless steel DIN 1.4301
Case diameter 10 mm
Case length 30 to 100 mm
Ingress protection IP 67
Insulation resistance in normal environment min. 20 MΩ
Contact connection 2wires
Lead-in cable RADOX shielded 2 x 0,5 mm2
Weight min. 0,2 kg acc. to design
*) in 5 °C steps on request

Shock and vibration tests category 2 in accordance with EN 61373
Insulation test 4 kVDC for time 1 minute in accordance with EN 50155
Fire protection resistance
in accordance with EN 45545 and in accordance with NFPA 130

Note: Manufacturer reserves the right to make changes in design and technical characteristics of the products. For actual information, please always contact your dealer.

In case of change cable to silicone shielded 2 x 0.34 mm2 (does not meet standard EN 45545-2) :

- measuring range: 70 °C to 180 °C

Datasheet - KTSB 087/R Bimetallic switch
 Datasheet - KTSB 087/R Bimetallic switch Datasheet - KTSB 087/R Bimetallic switch
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