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Home ProductsMiniature Thermal Switch

JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch

JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch

JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch
JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch

Large Image :  JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch Get Best Price

Product Details:
Place of Origin: CHINA
Brand Name: Yusheng
Certification: CQC,TUV,UL,CE
Model Number: JUC-31F
Payment & Shipping Terms:
Minimum Order Quantity: 1000PCS
Price: Negotiable
Packaging Details: InternationalTO220/Y220 standard package
Delivery Time: 5-7 work days
Payment Terms: T/T, Western Union
Supply Ability: 1,000,000PCS per Month
Detailed Product Description
Model: JUC-31F Contact Load: AC 120V/220V 1A, DC 48V 1A
Contact Type: 1D(normally Closed) Or 1H(normally Open) Life Cycle: 100,000 Times
Weight: Approximately 2grams External Dimension: L*W*H = 29.3mm*10mm*4.5mm
High Light:

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Quick Detail:


Model JUC-31F
Reset Type Auto Reset
Rated Voltage & Current AC 120V/220V 1A, DC 48V 1A
Contact Type 1D(Normally Closed) or 1H(Normally Open)
AmbientTemperature -55℃ ~+180℃
Temperature differentials 8.5~55℃ (difference between off and on temperatures)
Temperature tolerance ±3.0℃, ±5.0℃, ±8.0℃, ±10.0℃
Circuit Resistance ≤50mΩ
Insulation Resistance ≥100MΩ
Dielectric Strength ≥1500V
Life Cycle 100,000 Cycles
Certificate CQC,TUV,UL,CE




JUC-31F Series Miniature Thermal Switch is a snap-action thermostat with a bi-metal disc as the temeprature sensing element. Its main working principle is to control the temperature by opening or closing the bi-metal strip. It stays at normally closed/normally open status, it opens/closes when temeprature rising and closes/opens when temperature decreasing. It has the characteristics of snap action,high accuracy, long life cycle, high sensitivity, high reliability, small size, light weight, easy installation and so on. We use international TO220/Y220 standard packingJUC-31F Miniature Thermal Switch has been granted national patent, and has passed UL, TUV, CE, CQC, CB and ROHS. It also has passed the 100,000 life test of UL laboratory. It is widely used in printed circuit board equipment, power supply equipment, audio amplifier, welding equipment, automation equipment and instrumentation for temperature control and temperature protection.


1. JUC-31F Miniature Thermal Switch’s Principle and structure

The product is a sensor of belonging to touch-type plastic Snap temperature thermostat ,the adoption of international TO220/Y220 standard package ,the product has high reliability ,sensitive and accurate ,small size ,light weight ,very easy to install and so on , very suitable for PCB circuit board / heat equipment/ power device installed Specification


2. JUC-31F Miniature Thermal Switch’s Specification

2.1. Contact load: AC 120V 1A; DC48V 1A; AC 220V 1.5A/3A; DC 24V 1.5A/3A

2.2. Contact type : D for normally closed type; H for normally open type

2.3. Temperature

Operating temperature/°C Recovery temperature/°C(lower than Operating temperature) Error Testing way (Speed of temperature rise and fall)
0~99 5~35 ±3°C 1°C/min
100~130 7~40 ±5°C

2.4. Overheating temperature:250 degrees

2.5. Contact resistance: less than 50mΩ

2.6. Insulation resistance : more than 100 mΩ

2.7. Dielectric withstand voltage: more than 1500V

2.8. Product life: more than 10000 times

2.9. Weight:1.7 g

2.10. Action temperature deviations:+-5 degrees


3. The drawing of JUC-31F

JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch 0

JUC-31F 250V 2A Mini Bimetallic Thermal Cutoff Switch 1


4. Action Temperature Table

Operating temperature Recovery temperature Form of contract point Rated load Contract resistance Insulation resistance Dielectrics voltage-resistance

Testing mode:

Speed of temperature rise and fall

40℃±5℃ 5℃~15℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
45℃±5℃ 5℃~15℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
50℃±5℃ 5℃~15℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
55℃±5℃ 6℃~16℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
60℃±5℃ 6℃~18℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
65℃±5℃ 7℃~20℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
70℃±5℃ 7℃~20℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
75℃±5℃ 8℃~22℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
80℃±5℃ 8℃~24℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
85℃±5℃ 8℃~25℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
90℃±5℃ 8℃~27℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
95℃±5℃ 10℃~28℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
100℃±5℃ 10℃~30℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
105℃±5℃ 11℃~31℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
110℃±5℃ 11℃~33℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
115℃±5℃ 11℃~35℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min
120℃±5℃ 11℃~36℃ 1D,1H 250VAC1A ≤50mΩ ≥100MΩ 1500VAC 5℃~8℃/min


4. JUC-31F Miniature Thermal Switch’s Application


JUC-31F Miniature Thermal Switcht is applicable to Electric equipment, electric product, household appliance, the protection of temperature control, thermal overload in circuit board, Communication power supply , switching power supply,UPS power supply, medical power supply, fire power ,the module power supply ,audio amplifier equipment, various types of rechargeable devieces, rectifiers, inverters, welding equipment ,aerospace instrumentation electronic equipment , automation equipment ,military, Commercial product temperature control or temperature protection.


Competitive Advantages:


1. Small size and expedient installation

2. Snap action,high accuracy

2. High temeprature resistance

3. High reliability

4. Long life cycles of 100,000 times

5. UL,CQC,VDE and RoHS certification approval

6. Wide application


1 , using the contact temperature installation should be charged with the metal cover up snapping apparatus mounting surface , to ensure that the temperature effect , should be coated with thermal grease or other similar thermal properties of the medium in the surface temperature .

2 , the installation can not cover up the top collapsed , loose or deformed , so as not to affect performance.

3, can not allow the liquid to penetrate the internal temperature may not make the shell cracks , are not free to change the shape of the external terminals.

4 , the product is not greater than 5A current in the circuit , chose the copper cross-section 0 5-1 mm 2 wire connection ; . No greater than 10A current in the circuit , chose the cross-section of 0.75-1.5 mm 2 copper wire connection.

5, the product should be less than 90% relative humidity , ambient temperature is below 40 °C ventilated, clean, dry , non-corrosive gases stored in the warehouse .

KSD-01F classification , in accordance with the temperature to points, can also be classified according to the material , you can also follow the installation way points.

According to the nature of the action : the action can be divided into normally open(H Type) and normally closed(D type).




Mini Temeprature Protector, Thermal Cutout Switch, Temperature Control Switch,Thermostat, Mini Thermostat, Temperature Cutoff 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