Capillary Bi-metal Thermostat, also called liquid expansion thermostat, is a kind of temperature controller that can control the temperature accurately. The working principle of Capillary Bi-metal Thermostat is the thermal expansion and contraction. Specification of Capillary Bi-metal Thermostat...
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Capillary Bi-metal Thermostat, also called liquid expansion thermostat, is a kind of temperature controller that can control the temperature accurately. The working principle of Capillary Bi-metal Thermostat is the thermal expansion and contraction.
A capillary bi-metal thermostat is a type of temperature control device commonly used in various heating and cooling systems. It consists of a bi-metallic strip, a capillary tube filled with a temperature-sensitive fluid, and a control switch.
The bi-metallic strip is made up of two different metals with different coefficients of thermal expansion, typically steel and copper. These metals are bonded together, forming a strip that bends when heated or cooled. The degree of bending depends on the temperature changes in its surroundings.

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Temperature Range | -35°C ~ 320 °C |
Rated Voltage | 250V |
Rated Current | C-1 16A; C-2 4A |
Contact Resistance | ≤50mΩ |
Insulation Resistance | ≥100MΩ/500V |
Diameter of Sensing Bulb | 3mm,4mm,5mm,6mm |
Capillary length | 300mm to 3000mm |
Terminal Orientation | Flat Out, 90°, 60° |
Material of Capillary and Sensing | Stainless Steel and Copper optiona |
Reference Drawing

The Capillary Bi-metal Thermostat has the following characteristics:
Accurate temperature control
Long seivice life
Stable and reliable
Small temperature difference between start and stop
Store in a well-ventilated place without corrosive substances. It should not fall on the ground or be hit by rain and snow. The temperature should not exceed 40 °C. The storage period is one year.

Capillary bi-metal thermostats are commonly found in applications such as household thermostats, refrigerators, ovens, water heaters, and other heating and cooling devices. They provide a simple and reliable method for controlling temperature by utilizing the thermal expansion properties of bi-metal strips and the pressure changes in the capillary tube.
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