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Dongguan Longkey Electronic Co., Ltd.

Degaussing PTC Thermistors

Degaussing PTC Thermistors

2006-7-5
Degaussing circuits equipped with our PTC thermistors ensure perfect 

picture quality for large screen TVs and PC monitors.
Time Delay PTC Thermistor

Time Delay PTC Thermistor

2006-7-5
Our time delay thermistors can replace traditional ballasts. 

Lamps that no longer work with traditional ballasts because 

of the higher voltage without pre-heating, turns them black. 

Using PTC, can increase the lamp's life up to four times.
Electronic Circuit

Electronic Circuit

2006-7-5
LKM4140 consists of four identical over-voltage protection devices, 

with a double protection function. When there is an overload, 

the 5.6V stabilizing diode is destroyed reversing the short circuit 

to ground without a signal in order to protect the load. 

So at the same time of the PTC current increase, the PTC is still 

functioning. The input current decreases as an open circuit.
Overheating Protection Device

Overheating Protection Device

2006-7-5
Without protection, abnormal current loads will destroy 

transformers or switching power sources. This device can be 

directly installed for overheating protection without changing the 

circuit.
Overload Protection PTC Thermistors

Overload Protection PTC Thermistors

2006-7-5
Thermistors for limited current are fuses that can be used ten 

thousand times. This series can replace traditional fuses that cannot 

recover by themselves and replace expensive temperature switching.



Circuit protection for motor starters, transformers, chargers, 

low-voltage source, fluorescent lamps, multi-meters, transistors, 

computers, auto-lathes, telephone exchangers, AV equipment, 

and camcorders.
Isinglass Heating Elements

Isinglass Heating Elements

2006-7-5
Specifications:

1) Base material: isinglass

2) Rated voltage: 4 – 240V

3) Power density: 0.01 – 0.5W/cm2

4) Surface temperature: 30 – 450oC

5) Max. insulation voltage: 3,750V/2mA

6) Widely used for warm fans, vacuum barrels, electric fans, 

   and electric foot warmers
Glass Heater

Glass Heater

2006-7-5
Specifications:

1) Base material: glass

2) Rated voltage: 110 – 240V

3) Power density: 0.05 – 10W/cm2

4) Max. insulation voltage: 5,000V/2mA

5) Operating life: 20,000 times

6) Widely used in water heaters, steam combs and warm water devices
PTC Thermistors

PTC Thermistors

2006-7-5
Specifications:

1) Automatic temperature control

2) Secure and stable, without burnout

3) Conserves energy

4) Simple construction

5) Wide voltage

6) Operating life: up to 5,000 hours

7) Customized orders as per clients' specifications available
Electric Velamen

Electric Velamen

2006-7-5
Specifications:
1) Stable performance and long life; up to 10,000 hours
2) High efficiency and energy saving: saves up to 30%
3) Infrared radiation: 2.5 – 13.5#&956;m
4) Rated voltage: 6 – 240V
5) Applications: can be sintered on the surface of various materials 
   including vitreous, ceramic, glass, mica, and polymers
PTC Fan Heater

PTC Fan Heater

2006-7-5
Specifications:

1) Voltage: 24 – 240V

2) Power: 100 – 3,500W

3) Materials: PTC and fan aluminum

4) Automatic temperature-control, electric-saving heater

4) Applications: air conditioners, dehumidifiers, dish dryers, 

   clothes dryers, portable heaters, car heaters

5) Operating life: 10,000 hours without burnout
PTC Air Conditioning Heaters

PTC Air Conditioning Heaters

2006-7-5
PTC auxiliary air conditioner heaters developed by us meet 

international standards. The PTC auxiliary air conditioner heaters 

are widely used in air conditioners, air curtains, and humidifiers.
Insect Killers

Insect Killers

2006-7-5
Specifications:

1) Quick starting

2) Easy to operate

3) Automatic temperature control

4) Customized orders as per client's specifications available
Standard PTC Heater

Standard PTC Heater

2006-7-5
Specifications:

1) Automatic temperature control

2) Safe and secure

3) Rated voltage: 110 – 240V

4) Surface temperature: 50 – 280oC

5) Applications: steam combs, vacuum flasks/dishes, hair curlers

6) Customized orders as per client's specifications available
PTC Water Heater

PTC Water Heater

2006-7-5
Specifications:

1) Safe and secure

2) Automatic temperature control

3) Suitable for surface temperatures below 260oC

4) Rated voltage: 80 – 240V

5) Power: 300 –1,000W

6) Max. insulation voltage: 1,500V/4s

7) Customized orders as per client's specifications available
PTC Wave Heater

PTC Wave Heater

2006-7-5
Specifications:

1) Power: 100 – 3,500W

2) Input current: 2 –30A

3) Rated voltage: 24 – 240V

4) Applications: air conditioners, dehumidifiers, dish dryers, 

   clothes dryers, portable heaters, car heaters

5) Operating life: up to 1,000 times

6) Customized orders as per client's specifications available
Porous PTC

Porous PTC

2006-7-5
Specifications:
1) No burnout or short circuiting
2) Heat-balance time: up to 10 minutes
3) Operating life: below to 5,000 hours
4) Customized orders as per client's specifications available
Polymer Heater

Polymer Heater

2006-7-5
Specifications:

1) Base material: polymer

2) Rated voltage: 3 – 240V

3) Power density: 0.09 – 2.5W/cm2

4) Surface temperature: 30 – 80oC

5) Max. insulation voltage: 3,750V/5mA

6) Operating life: 50,000 times

7) Widely used for glove warmers and insole heaters
Contact Information
Company Name: Dongguan Longkey Electronic Co., Ltd.
Contact Person: n/a
Address: Xingguang Road, Shilong Town, Dongguan City, Guangdong Province. China
Zip: n/a
Telephone: n/a
Mobile Phone: n/a
Fax: n/a
Website: n/a