BW series thermostat / KSD9700 thermal protector / BW9700 temperature protector
1.     H20,H21 series thermostat’s Principle and structure
H20,H21serial universal and enhanced protectors with large metal casing are composed of the thermal conductive metal casing, bimetallic parts welded with silver alloy contact point, conductive bracket, insulation fixation stand, fixed contact strip and heat resistance cable. In case of abnormal operation, along with the increase of the environment temperature to the set value, the bimetallic parts perform quick action, open the contact point, and disconnect the circuit. When the device is cooled to the temperature for safe operation, the contact point will automatically closes and recover normal operation.
2.     H20,H21series thermal protector’s Specification
2.1. Switch type: normally closed, normally opened.
2.2. Operating Voltage / Current: AC250V / 5A; AC125V / 8A
2.3. Operating Temperature: 40~150℃ (one step for every 5°C)

2.4. Standard Tolerance: ±3°C / ±5°C / ±7°C
2.5. Reset temperature: operating temperature decrease by 15-45°C
2.6. Contact Closure resistance: ≤50mΩ
2.7. Insulation resistance: ≥100mΩ
2.8. Electric strength: AC1500V/1min free from phenomena of break down and flashover.
2.9. Service life: 10000 times
3.     H20,H21series thermal protector’s Dimension

Model	Case	Length	width	High	Lead wire
H20	Plastic	18.5	8	4	#22 3266 white, or according client’ reques
H21	Metal	18.5	7.3	3.8	#20 3135 red, or according client’ request

 

4.     H20,H21series temperature protector’s Application
H20,H21series is applicable to chargeable battery, ballast, massager, micro motor, transformer, electric tools, heat electric appliance and instrument etc.
 
The product UL,CQC,TUV and RoHS certification approval.