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WHD-B (30A) Capillary Bulb Thermostat

The WHD-B is a Capillary Bulb Thermostat designed for temperature control in heating equipment. A sensing bulb and capillary tube detect the temperature at the heating point, while the thermostat switches the heating circuit according to the dial setting.

The WHD-B is available in 16A and 30A versions, with a 0–320°C temperature range and 300–2000 mm capillary options. It is suitable for appliance manufacturers, equipment suppliers, distributors, and OEM projects.

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* Rate: AC16A 250V
* Temperature Range: 0-320℃
* Bulb Dia: 6mm
* Bulb Length: as different temperatures
* Max resistance temperature T125
* Length of Capillary: 300-2000mm
* On-off Temperature Difference: 2-12℃
* Application: Oven, griddle, fryer, heater, boiler, etc.

Parameter Specification
Model WHD-B
Type Capillary Bulb Thermostat
Rated Current / Voltage AC 250V, 30A or 16A
Temperature Range 0–320°C
Setting Method Dial
On-Off Temperature Difference 2–12°C
Sensing Bulb Diameter 6 mm
Sensing Bulb Length Depends on temperature range ordered
Capillary Tube Length 300–2000 mm
Max. Withstand Temperature T125


WHD-B Capillary Bulb Thermostat Advantages
Adjustable Dial Setting

The control dial allows direct adjustment of the target temperature according to the heating equipment's operating requirements.

Wide Temperature Range

The 0–320°C range provides temperature control for a broad range of heating equipment.

Flexible Bulb and Capillary Length

The sensing bulb length is matched to the ordered temperature range, while 300–2000 mm capillary options support different equipment layouts.

Mechanical Temperature Control

The Capillary Bulb Thermostat uses a sensing bulb, capillary tube, and mechanical switching structure to control the heating circuit according to the selected temperature.

Flexible Current Selection

The 16A and 30A versions allow the thermostat configuration to match different heating circuit requirements.

WHD-B Capillary Bulb Thermostat Applications

The WHD-B is suitable for:

Ovens
Griddles
Fryers
Heaters
Boilers
Other heating equipment within the specified temperature and electrical ratings

The sensing bulb is installed at the temperature control point, while the thermostat body can be mounted according to the equipment layout.


WHD-B Capillary Bulb Thermostat Manufacturer and OEM Supplier

As a Capillary Bulb Thermostat manufacturer and Factory, the supplier provides WHD-B thermostats for appliance manufacturers, heating equipment suppliers, distributors, and wholesale buyers.

Custom and OEM Service

Custom and OEM configurations can be discussed according to the required temperature range, sensing bulb length, capillary tube length, and current rating.

Factory Supply and Wholesale

Factory supply is available for equipment manufacturers, distributors, and Wholesale buyers. Product selection can be based on the heating circuit voltage, current, operating temperature, and installation requirements.

WHD-B Capillary Bulb Thermostat FAQ

How do I choose between the 30A and 16A version?

Select the version according to the heating circuit's voltage and current requirements. The load specifications can be provided when ordering to confirm the appropriate configuration.

How is the temperature set on the Capillary Bulb Thermostat?

The WHD-B uses a manual dial for temperature setting. The dial can be adjusted according to the required operating temperature.

Where should the sensing bulb be installed?

Place the sensing bulb at the point where temperature needs to be controlled, with suitable thermal contact with the oil, air, or heated surface. It should not be placed directly on the heating element.

Is the sensing bulb length the same for every Capillary Bulb Thermostat?

No. The sensing bulb length depends on the ordered temperature range. The required working temperature should be provided when ordering.

What capillary tube lengths are available?

The WHD-B supports capillary tube lengths from 300 to 2000 mm. The appropriate length can be selected according to the distance between the sensing point and thermostat mounting position.

Can the Capillary Bulb Thermostat be used for boilers?

Yes. The WHD-B can be used for boiler applications when the operating temperature and electrical load remain within the specified ratings. Separate over-temperature protection should be provided where required by the equipment design.

Can the WHD-B be customized for OEM projects?

Yes. Custom and OEM configurations for this Capillary Bulb Thermostat can be discussed based on the required current rating, temperature range, sensing bulb configuration, and capillary tube length.

About Us
Wenzhou Leheng Technology Co., Ltd.

Company Advantages

Experienced Manufacturer:

Established in 2012, we specialize in the development and manufacturing of thermostats, temperature limiters, rocker switches, and PCB thermostats.

Automated Production:

Standardized production lines and self-developed automated equipment support efficient assembly, testing, and consistent manufacturing quality.

Stable Production Capacity:

With monthly production exceeding 1 million units and annual output exceeding 12 million units, we support stable supply for B2B orders.

Global Supply:

Our products are exported to more than 80 countries and regions, supported by professional sales and order service.

Certificate Of Honor

We maintain strict quality control and hold certifications including UL, TUV, CE, CQC, KC, RoHS, REACH, SGS, ISO 9001, and ISO 14001. We hold multiple patents, and have participated in the development of national industry standards.
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