Dongguan Yusheng Electronics Co., Ltd.

Quality is life, service is the soul.

To be global No.1 Brand of thermal switch and thermal protector.

Sales & Support
Request A Quote - Email
Select Language
About Us
Factory Tour
Quality Control
Contact Us
Request A Quote
Home ProductsSnap Disc Thermal Switch

KSD301 16A 250V Snap Disc Thermostat For Water Heater

KSD301 16A 250V Snap Disc Thermostat For Water Heater

KSD301 16A 250V Snap Disc Thermostat For Water Heater
KSD301 16A 250V Snap Disc Thermostat For Water Heater KSD301 16A 250V Snap Disc Thermostat For Water Heater KSD301 16A 250V Snap Disc Thermostat For Water Heater KSD301 16A 250V Snap Disc Thermostat For Water Heater

Large Image :  KSD301 16A 250V Snap Disc Thermostat For Water Heater Get Best Price

Product Details:
Place of Origin: CHINA
Brand Name: Yusheng
Certification: CQC.TUV,VDE,UL
Model Number: KSD301
Payment & Shipping Terms:
Minimum Order Quantity: 1000PCS
Price: Negotiable
Packaging Details: 1000PCS or 2000PCS Per Carton, Carton Size: 280*270*320mm
Delivery Time: 7-10 work days
Payment Terms: L/C, T/T, D/A, D/P, Western Union
Supply Ability: 1,000,000 Pcs Per Month
Detailed Product Description
Name: Snap Disc Thermal Switch Model: KSD301
Reset Type: Auto Reset Or Manual Reset Rated Volts & Amps: 250V AC 10A/16A
Contact Type: Normally Closed Or Normally Open Temperature Range: 0~250℃
Diameter Of Bi-metal Disc: 12.8 Mm (1/2 Inch) Insulation Resistance: More Than 100MΩ
Contact Resistance: Less Than 50mΩ Cover: Fixed / Movable / Screw
Case: Bakelite / Ceramic Tolerance: +/-5 C For Open Action(Optional +/-3 C Or Less), +/-5C
Frequency: 50/60Hz Life Cycle: 100,000 Cycles
High Light:

16A 250V Snap Disc Thermostat


KSD301 Snap Disc Thermostat


KSD301 Snap Disc Thermal Switch

KSD301 16A 250V Snap Disc Thermostat For Water Heater Electric Heat Kettle



Quick Detail:

Model KSD301
Reset Type Auto Reset
  Single Pole,Single Throw(SPST)
Body Material: Bakelite or Ceramic
Rated Voltage & Current 250V AC 10A/16A
Contact Type

Normally Closed(Open on Rise) or Normally Open(Close on Rise)

Operating Temperature Range

0~150℃ (Bakelite Body),0~250℃ (Ceramic Body)

Temperature differentials 8.5~55℃ (difference between off and on temperatures)
Temperature tolerance ±3.0℃, ±5.0℃, ±8.0℃, ±10.0℃
Contact Resistance ≤50mΩ
Insulation Resistance ≥100MΩ
Dielectric Strength ≥1500V
Life Cycle 100,000 Cycles




 KSD301 thermal switch’s Principle and structure

The main principle of KSD301 series thermostat is that one function of bimetal discs is snap action under the change of sensing temperature. The snap action of disc can push the action of the contacts through the inside structure, and then caused on of off the circuit finally. The main characteristic are the fixation of working temperature, the reliable snap action, less flashover longer working life and less radio interference.

It is widely used in rice cooker, microwave oven, electric water boiler,room heater, egg boiler and electric steamer,etc.


KSD301 thermal switch’s application

1.Household electric appliances: water dispenser,electric water pots,toaster,dishwasher,drying machine, disinfection cabinet, microwave oven, electric kettle, electric caldron, refrigerator,air-condition,laminator etc.

2. Office equipment

3. Car seat heat, car deicer

KSD301 thermal switch’s specification

1. Electrical Rating: AC 125V max 15A; AC250V 5A 10A 15A max 16A

2. Action Temperature: -10~300 ℃, Temperature accuracy: ±3 ±5 ±10℃.

3. Recovery and action temperature difference:

A. Auto reset: 8 to 100℃(Optional),Temperature accuracy: ±3 ±5 ±10℃.

B. Manual reset

4. Terminal

a. Terminal type: 187series of 4.8*0.5mm and 4.8*0.8mm, 250 series of 6.3*0.8mm

b. Terminal Angle: bending angle: 0~90°C optional

5. Life cycle: ≥100000

6. Dielectric Strength: AC50Hz 1500V / min, no breakdown blinding (Normal State)

7. Circuit resistance: 50mΩ

8. Insulation resistance:100mΩ

9. Normally closed or Normally open

10. Protection degree: IP00

11. Two kinds of body: plastic or ceramic.

12. Temperature sensor face: Aluminum cap or copper head.

13. Holder: without holder, free holder, fixed holder.




1. Dimensional Outline

KSD301 16A 250V Snap Disc Thermostat For Water Heater 0


2. BOM

No. Part No. Part Name Qty.
1 KSD301-01 Body 1
2 KSD301-02 Guide Frame 1
3 KSD301-03 Cap 1
4 KSD301-04 Bimetal Disc 1
5 KSD301-05 Action Rod 1
6 KSD301-06 Static Contact Plate 1
7 KSD301-07 Ø3.5static contact point 1
8 KSD301-08 Ø3.5moveable contact point 1
9 KSD301-09 Movable Contact Plate 1
10 KSD301-10 Short Rivet 1
11 KSD301-11 Long Rivet 1
12 KSD301-12 Reset Button 1
13 KSD301-13 Push Rod 1
14 KSD301-14 Pressing Plate 1
15 KSD301-15 Lead Wire 2
16 KSD301-16 SP 2Y Terminal 1


3. Action Temperature Table

Standard Temperature Sheet
Action Temperature Reset Temperature Action Temperature Reset Temperature
45±3℃ 35±5℃ 145±5℃ 125±7℃
50±3℃ 40±5℃ 150±5℃ 130±7℃
55±3℃ 45±5℃ 155±5℃ 135±7℃
60±3℃ 50±5℃ 160±5℃ 140±8℃
65±3℃ 50±5℃ 165±6℃ 145±8℃
70±3℃ 55±5℃ 170±6℃ 150±8℃
75±3℃ 60±5℃ 175±6℃ 155±8℃
80±3℃ 65±5℃ 180±7℃ 160±10℃
85±3℃ 70±5℃ 185±7℃ 155±10℃
90±3℃ 75±5℃ 190±7℃ 160±10℃
95±3℃ 80±5℃ 195±7℃ 165±10℃
100±4℃ 85±6℃ 200±8℃ 170±10℃
105±4℃ 85±6℃ 205±8℃ 175±10℃
110±4℃ 90±6℃ 210±8℃ 180±10℃
115±5℃ 95±6℃ 215±10℃ 185±10℃
120±5℃ 100±6℃ 220±10℃ 190±10℃
125±5℃ 105±6℃ 230±10℃ 200±10℃
130±5℃ 110±6℃ 240±10℃ 205±12℃
135±5℃ 115±6℃ 250±10℃ 210±15℃
140±5℃ 120±7℃    
Remark :
0-60℃±5℃: Reset Temperature=Action Temperature-10℃
60-120℃±5℃: Reset Temperature=Action Temperature-15℃
120-160℃±5℃: Reset Temperature=Action Temperature-20℃
160-200℃±7℃: Reset Temperature=Action Temperature-25℃
200-250℃(±8℃-10℃): Reset Temperature=Action Temperature-30℃/40℃


Competitive Advantages:


1. Mininature size, convenient in installation;

2. Automatic reset

3. Meets or exceeds the most demanding specifications in a variety of AC and DC applications.

4. Terminals are optional and customized..

5. Contact type: k-Normally open, B-Normally closed

6. High temeprature resistance

7. High reliability, Durable

8. ROHS compliant

9. Wide application

10. No arcing

11. Long life and less disturb to wireless.


Main Applications are as follows:

Automotive diesel oil filtration heating

Heating tube , heating pad

Soybean milk machine, paper shredder, electric kettle

KSD301 16A 250V Snap Disc Thermostat For Water Heater 1



KSD301 16A 250V Snap Disc Thermostat For Water Heater 2

Installation and Direction for Use:


Method of earth: By means of the metal cup of thermostat connected in the earthing metal part.
The thermostat should work in environment with humidity not higher than 90%, free of caustic, flammable gas and conducting dust.
When the thermostat is used to sense the temperature of solid items, its cover should be clung to the heating part of such items. Meanwhile, heat-conducting silicon grease, or other heat media of similar nature, should be applied to the cover’s surface.
If the thermostat is used to sense the temperature of liquids or steam, it is strongly recommended to adopt a version with stainless-steeled cup. Moreover, cautious measures should be taken to prevent liquids getting into/onto the thermostat’s insulation parts.
The top of the cup must not be pressed to sink, so as to avoid adverse effect on the thermostat’s temperature sensitivity or its other functions.
Liquids must be kept out of the thermostat’s inner part! The base must avid any force that could lead to crack; it should be kept clear and away from the pollution of electric substance to prevent insulation weakening that leads to short-circuited damages.
The terminals should be bent, or else, the reliability of electric connection will be influenced.

KSD301 16A 250V Snap Disc Thermostat For Water Heater 3



Thermal Disk Switch, Bimetal Thermostat,Temperature Switch,Temperature Cutoff Switch, Thermal Cutout Switch


Contact Details
Dongguan Yusheng Electronics Co., Ltd.

Contact Person: Ms. Amy Li

Tel: 86-13553890655

Fax: 86-769-82869802

Send your inquiry directly to us