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Products / Commercial & Industrial Heating / Controllers

Capillary thermostat


Electric circuit diagram

Capillary thermostat Explosion thermostat for overhang mounting

Brief description

  • The thermostats are delivered in form of STW devices (temperature limit switches)
  • The thermostat operation is based on thermal expansion of a liquid or gas
  • Electric switching unit of the device is made in form of a microswitch located inside a plastic enclosure
  • The thermostats meet RoHS requirements and do not contain cadmium
  • The devices can operate at extremely low temperatures


Explosion proof overhang mounting thermostats are designed for thermal processes control and monitoring. They can be used directly in explosion hazardous zones (zone 1 and zone 21).

Principle of operation

When the temperature of the sensing element exceeds the preset value, the microswitch operates via transfer mechanism and the electric circuits becomes opened. When the temperature drops below the preset value (taking into account a differential gap), the microswitch returns to its initial position.


Temperature control range, °C 0 ... +200
Differential gap, % 2,5
Capillary length, mm 1000
Capillary material stainless steel
Sensing element diameter, mm 4
Switching capacity at 230 VAC, A 25
Ambient temperature (at operation and storage), °C from -55 to +50
Protection grade according to GOST 14254-96 IP65
Climatic version according to GOST 15150-69 NF (boreal climate 1)
Weight, kg not more than 1,7
Cable entry type metal M20x1,5
Input cables diameter, mm from 6 to 17
Connecting conductors cross-section, mm2 up to 4 inclusive

It is allowed to input armored cables into the thermostat with sealing of their outer jacket above the armor.

Overall and mounting dimensions

Explosion protection marking

GOST R Ex de IIC T4/T5/T6 Gb
ATEX II 2G Ex de IIC T4/T5/T6 Gb

Ordering information

THERMOSTAT WITH THE SCALE 0 ... +200 °C Thermostat exTHERM-AT, type 60/00588595