Application:

General pupose capillary thermostats are widely used for maintaining the required temperature of an air or liquids in different kinds of electric appliances such as water heaters, boilers, washing machines, dryers, fan heaters, electric ovens and other kitchen equipment.

Design features:

Operation of capillary thermostats is based on liquids property to increase their volume when heated. A rise in temperature causes an expansion of the liquid inside a capillary and a bulb. It acts on a diaphragm installed in a thermostat housing and switches electrical contacts. This is how temperature regulation is performed inside the controllable device. Capillary thermostat does not consume electricity what makes it highly energy-efficient. Nominal contacts load is 16A at 250V AC. Sensing bulb and capillary tube can be made of stainless steel or copper depending on a model. There are two series of capillary thermostats produced by Essima - WKB and WKC with different design of the body. Operating temperature of our products ranges from 0°C to 350°C. Each item has a mounting bracket with two threaded holes M4 and center distance 28 mm. Models of Essima capillary thermostats and their characteristics are specified in a table below. Products with other characteristics are available on request.

General characteristics:

  • Bulb and capillary material — copper or stainless steel.
  • Contacts configuration — 1 normally closed (1NC) or 1 change-over (1CO) contacts.
  • Operating temperature range: 0°С…+40°С, 0°С…+60°С, 30°С…+85°С, 30°С…+110°С, 0°С…+120°С, 50°С…+250°С, 50°С…+270°С, 50°С…+280°С, 50°С…+320°С, 50°С…+350°С.
  • Electrical rating: 16A/250VAC.
  • Mounting bracket center holes: 28 mm with M4 screw.
  • Model range and characteristics

  • Marking

  • Dimensions

Model

Operating temperature, °C

Hysteresis, °C

Nominal contact load at 250V AC, A

Capillary and bulb material

Contacts configuration

WKB-40S1

0...40

2...5

16

Stainless steel

1 normally closed contact

WKB-40S2

0...40

2...5

16

Stainless steel

1 change-over contact

WKB-60S1

0...60

4±2

16

Stainless steel

1 normally closed contact

WKB-60S2

0...60

4±2

16

Stainless steel

1 change-over contact

WKB-85S1

30...85

2...6

16

Stainless steel

1 normally closed contact

WKB-110S1

30...110

2...8

16

Stainless steel

1 normally closed contact

WKB-120S1

0...120

5±3

16

Stainless steel

1 normally closed contact

WKB-270S1

50...270

2...10

16

Stainless steel

1 normally closed contact

WKB-280S1

50...280

8±5

16

Stainless steel

1 normally closed contact

WKС-40С1

0...40

6±4

16

Copper

1 normally closed contact

WKС-90С2

30...90

5±3

16

Copper

1 change-over contact

WKС-120S2

30...120

6±3

16

Stainless steel

1 change-over contact

WKС-250S1

50...250

7±5

16

Stainless steel

1 normally closed contact

WKС-320S1

50...320

7±5

16

Stainless steel

1 normally closed contact

WKС-350S2

50...350

10±5

16

Stainless steel

1 change-over contact

WKС-350S1

0...350

8±5

16

Stainless steel

1 normally closed contact

Essima capillary thermostats marking

WKB series with 1NC contact

WKB series thermostat drawing with 1 NC contact

Model

А, mm

B, mm

ØC, mm

L, mm

WKB-40S1

15

121

6

900

WKB-60S1

15

121

6

1000

WKB-85S1

15

75

6

1500

WKB-110S1

23

100

6

1200

WKB-120S1

15

85

6

2500

WKB-270S1

15

92

4

1500

WKB-280S1

23

153

3

900

WKB series with 1 change-over contact

WKB series thermostat drawing with 1CO contact

Model

А, mm

B, mm

ØC, mm

L, mm

WKB-40S2

21

127

6

1000

WKB-60S2

21

127

6

1000

WKC series with 1NC contact

WKC series thermostat drawing with 1NC contact

Model

А, mm

B, mm

ØC, mm

L, mm

WKС-40С1

15

112

6

900

WKС-250S1

15

160

3

2500

WKС-320S1

15

130

3

2500

WKС-350S1

20

90

3

900

WKC series with 1 change-over contact

WKC series thermostat drawing with 1CO contact

Model

А, mm

B, mm

ØC, mm

L, mm

WKС-90С2

15

112

6

1000

WKС-120S2

15

80

6

1000

WKС-350S2

15

105

3

2500

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