1A-20A Thermal Cutoff Fuses

1A-20A Thermal Cutoff Fuses

Product Details:

Place of Origin: China
Brand Name: Tian Rui
Certification: ROHS
Model Number: Resistor Type

Payment & Shipping Terms:

Minimum Order Quantity: 1000PCS
Price: Negotiable
Packaging Details: 100PCS/Bag
Delivery Time: 5-7 Days
Payment Terms: D/P, T/T,Paypal, Western Union
Supply Ability: 1000000PCS/Month
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Detail Information

Type: Thermal Cutoff Fuse Rated Current: 1A-20A
Rated Voltage: 250V Case: Ceramic
Shape: Resistor Lead Wire: Axial Lead
Pin: Copper Wire Coating: Resin
Quality: 100% Tested Application: Over-temperatre Protection
High Light:

20A Thermal Cutoff Fuses


ROHS Thermal Cutoff Fuses

Product Description


Electric Fan Motor Axial Ceramic Case Resistor Type Temperature Fuse Thermal Cutoff Fuse


The thermal fuse is composed of ceramic shell, low melting point alloy wire, special resin, pin copper wire and sealing resin.


The marking must be clear; the sealing resin should fill the mouth and it is acceptable; the lead tin-plated layer is good; there is no oxidized black spot damage; the shell has no damage marks, perforations, etc.


No. Rated operating temperature
Hold temperature
Limit temperature Tm
Measured operating temperature
Rated voltage    (V) Rated current
Y20 115 87 150 112±3 250 2


a b c d
9.5±0.5 80±5 0.5±0.2 2.5±0.1


1A-20A Thermal Cutoff Fuses 0



Thermal Fuse



Applicable Standards


Test items


Safety standard

Testing equipment

Action temperature detection



High pressure test


1000+2 times the rated voltage

Withstand voltage tester

Insulation resistance detection



Digital Megger

Internal resistance detection



Bridge resistance tester

High pressure test after temperature check



Withstand voltage tester

Insulation resistance test after temperature test



Digital Megger

Distortion detection

Each lead is bent 90° at a distance of 10mm from the thermal fuse, and then twisted in the opposite direction by 180° without damaging the components.

Manual operation


Experimental Method
The experimental conditions are temperature 25±10℃, humidity 65±15%M
1 Action humidity accuracy: Rely on the IE691: 1995 inspection method and measure with the built-in silicone oil pool in the thermostat.
2 Size: Measure the finished product with a micrometer/vernier ruler.
3 Appearance: visual inspection.
4 Insulation resistance: Measure the finished product with SP-3A digital megohmmeter, and measure the voltage DC500V.
5 Withstand voltage: Use the ZNY-12 withstand voltage test to determine the finished product, which takes 1 minute.
6 Tensile force: Measure the finished product with a push-pull tester, and the pin bears 1.5 pounds of pulling force for 10 minutes without damaging the components.
7 Torsion: Bend the lead at 10mm at 90°C, and then reverse it at 180°C without damaging the component.


Test Requirements
1. Rated operating temperature (Tf): The temperature at which the thermal fuse is tested according to the standard method to change its conductive state. (The Japanese Electrical Appliances Management Law stipulates that the tolerance range is ±7℃ for operation).

2. Measured operating temperature: The temperature fuse is heated in the silicone oil bath at a rate of 0.5-1°C per minute, and the fusing temperature obtained when the detection current is less than 100MA. It is the actual temperature of the thermal fuse.

3. Holding temperature (Tc): The maximum temperature at which the thermal fuse can maintain 168 hours without changing its conductive state when passing the rated current.

4. Limit temperature (Tm): The maximum temperature at which the thermal fuse can withstand 10 minutes without reconnection.

5. Rated voltage (Ur): The highest working voltage of the thermal fuse.

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