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Contact: kevin li
Company: Dongguan Yaxun Electronic Hardware Product Co., Lt
Dongguan changping town bridge industrial zone 15 well
Dongguang 563200
Phone: +86 13827205356
Fax: +86 769 83811196
E-Mail: Send Inquiry
Date/Time:  9/12/17 3:09 GMT

Thermal Switch Manufacturing

Thermal Switch Supply
KSD301 series of products is the most widely used thermal switch. In Ya Xun, we provide high-precision dish-type bimetallic stamping, temperature classification, assembly, product testing one-stop service. Our product development for the needs of the market, there are a variety of different product size, different temperature control methods. If you are developing a new product, you need to know the product thermal protector, please contact our professional team, you can get a satisfactory offer and sample.

What Is Thermal SwitchWhat Is Thermal Switch
KSD301 series temperature sensing element is a bimetal, is the most commonly used electrical overheating protection. When the electrical work, the bimetal is in a free state, the contacts are in the closed / disconnected state, when the temperature of the electrical appliance does not rise normally, when the protection action temperature of the Thermal Switch is reached, subject to heat effects Bimetallic, produce internal stress and rapid action, open / close contact, off / turn-on circuit, which play a protective role in temperature. When the electrical cooling to the reset temperature, the contact automatically closed / open, turn on the power, to return to normal working condition. KSD301 series of products can generally be repeated tens of thousands of times.

Thermal Switch CharacteristicThermal Switch Characteristic
Stable performance, high precision;
Small size, light weight;
Not pull the arc, the structure of precision;
Can be reused, long life;
Widely used, the installation of diversification;
High Power, can be applied to large current electrical appliances;
Radio dry worry small.

Product Model Representation Method
K S D 301 / □ □ □ / □□□□□
K Class Code: K-Thermostat
Contact action mode S: S- instant action, M- slow-acting
D Temperature setting mode: D-fixed, T-adjustable
301 design code: 301
Fixed form: 1 - fixed aluminum cover, 2 - active ring free fixed, 3 - no fixed
Terminal posture: 1 - level; 2. vertical; 3-bend 45 °; 4. horizontal / vertical; 5-level / bend 45 °; 6. vertical / curved foot 45 °; 7 - no pin; 8 - other angles
Terminal type: 1-250 series; 2-187 series; 3-non-standard terminal
Operating temperature range Nominal value: 3 digits + On-off mode + 1-bit range absolute value.

Control MethodThermal Switch Control Method
KSD series of temperature control after years of technology development, in order to adapt to the product of a variety of temperature control methods, in the Ya Xun, to meet the requirements of different customers, the development of a variety of temperature control products:
1. Automatic reset: changes or decreases with temperature, the internal contact is automatically disconnected or automatically closed.
2. Manual reset (anti-dry type): Mainly used in water heaters, when the temperature rises, the contact will automatically disconnect; when the controller temperature cooling, you must manually press the button to reset the contact again closed power.
3. Normally closed(NC): Electrical appliances work properly, the contact is closed, the thermostat is in power state, when the temperature reaches the operating temperature, the bimetallic sheet heat generated internal stress, and rapid action, open the contacts, cut off / on circuit, which play a role in temperature control.
4. Normally open type(NO): Electrical work, the contact is in the open state, the thermostat is in power state. When the temperature reaches the operating temperature, the bimetallic sheet heat generated internal stress, and rapid action, closed contact, connected to the cooling power supply, reducing the temperature of the heat generating element, which play a protective role.
5. Conventional electrical parameter type: 1) AC250V 50 ~ 60Hz 5A / 10A / 15A (resistive load)
2) UL AC125V 50Hz 15A (resistive load)
6. High power type (KSD302): AC250V or 400V; 50 / 60Hz
1) 16A; 20A; 25A; 30A; 35A
2) 50A; 55A; 60A;
7. Defrost type: Mainly used in refrigerator defrost control. In the compressor running to a certain time, Immediately after the temperature of the -14 ° C felt by the defrosting thermostat on the evaporator, turn on current, at this time defrost timer operation, defrosting heater began to work, when the defrost thermostat feel +5 ℃, the defrost thermostat contacts open, defrost thermostat (tube) to stop working.

Product Structure
KSD301 series of temperature control switch, the basic components of the thermostat accessories:
Shell (bakelite, ceramic), Aluminum cover (stainless steel cover, copper stud), Terminals, contacts, rivets, static contact, moving reed, Temperature sheet (bimetallic sheet) and so on, manufacturing a precision thermostat, need more than a dozen processes, assembled by automated mechanical equipment.
1, KSD301 shell (bakelite and ceramics)
2.KSD301, KSD302 aluminum cover (thermal and protective effect)
3.KSD301 terminal 6.3mm 4.8mm (connection \ conductive effect)
Ksd301 terminal block Terminal size AxB 4.8x0.5 4.8x0.8 6.3x0.8
Axial force N 50 60 70

4, the contacts (the contacts of silver and copper, silver dot product expensive)
5, rivets (connection and fixed)
6, the stationary contact piece (copper)
7, moveable spring (copper)
8, Temperature sheet (Bimetallic)
Thermal Switch Manufacturing
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SOURCE: Import-Export Bulletin Board (
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