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Description and application


These temperature switches KTSZ4H with display are designed for using as two-state controllers (ON/OFF type control). They compare the temperature set-point with the actual temperature value and enable switching the galvanically separated (electrically insulated) contacts of a connected relay when the set temperature is reached. Supply voltage of the switches is 9 - 36 V DC / 9 - 24 V AC (by the type). two temperature sensing elements on the base of Pt (Pt 1000/3850) or on the base of Ni (ni 1000/6180) can be connected to the switches. The display indicates the present value of the measuring temperature during measure process. Setting of individual parameters is executed by two control buttons.

The switch can be used in 5 different modes:

  • Mode no. 1: the switch operates as a single controller which switches the first relay by the set temperature interval and the second relay is switched at the exceeding set emergency temperature (only one sensing element is used)
  • Mode no. 2: the switch operates as a doble controller which switches each relay by the set temperature interval (only one sensing element is used)
  • Mode no. 3: the switch operates as a double controller, which switvh each relay separatelyaccording to temperature interval (two sensing elemments are used, each separately for each relay)
  • Mode no. 4: the switch operates as a differential controller which switches on the base of temperature difference of two sensing elements (analogous to mode no. 1)
  • Mode no. 5: the switch operates as a differential controller which switches on the base of temperature difference of two sensing elements (analogous to mode no. 2)

The time delay of switching-off for the relay 1 within the limits 0–300 s can be set in each mode.

The switches are intended for assembly to the DIn slat. The temperature range of the switch applications depends on sensing element type and on temperature sensor type (for example for the sensor in the TG8 case the range is -50 °C to 200 °C). Maximum operating temperature range of the switch is -50 °C to 400 °c.

The temperature switches are intended for operating in a chemically non-aggressive environment.


  • 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

- Electromagnetic Compatibility in accordance with EN 50121-3-2, as amended

- 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. Can be supplied with materials complying with fire safety standard NFPA 130, 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
  • Wiring diagram
  • Dimensional draft
Switch type KTSZ4H-24
Type of sensing element Pt 100/3850 orPt 1000/3850 - standard
Ni 1000/6180 - modification
Connectionof the temperature sensor
Modes of temperature switch 1 to 2:
1 sensor - 2wire or 4wire
Modes of temperature switch 3 to 5:
1 sensor - 2wire or 4wire
2 sensor - 2wire
Output 2 relays
Maximum temperature operating range -50 °C to 400 °C (acc. to sensing element type and temperature sensor variant)
Power supply 10 - 35 V DC / 12 - 24 V AC (recommended 24 VDC/VAC)
Maximum switched voltage 250 V AC / 10 A
Maximum error of the switch* ± (0.15 % from the value + 1 dig) - minimal error 0.2 °C
Rosolution 0.1 °C
Setting range -50 °C to 400 °C, step 0.1 °C
Display 4 digits - red LED, high of the digits 10 mm
Brightness of the display setting 4 levels
Updating of the display < 0.2 s
Type of terminal board terminal board ARK 210, wire cross section 0.35 to 1.5 mm2
Material of the case LEXAN (meets standard EN 45 545-2)
Case dimensions 98 x 70 x 61 mm
Ingress protection IP 20 according to EN 60 529
Working conditions ambient temperature: -40 °C to 80 °C
relative humidity: max 85 % (at the ambient temperature 25 °C) atmospheric pressure: 87 to 107 kPa
Weight (without switch) 0.15 kg (without sens. el.)

*error of the sensing element is not incorporated

Shock and vibration tests category 1, class B in accordance with EN 61373
Elektromagnetic compatibility in accordance with EN 50121-3-2
Insulation test 4 kVDC for time 1 minute in accordance with EN 50155
Fire protection resistance
in accordance with EN 45545 (possible acc. to 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.

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