Polyswitch resettable fuse

Capacitors boosts the current and increases the power factor to an electrical motor. Search for the part s number you wish to receive samples. Or, visit the sample center page, polyswitch resettable fuse. PPTCs increase resistance as temperature increases due to increased flow.

These components remove the need for any temperature-based nuisance tripping across all such applications, while offering increased, high resistance protection in space-saving surface mount packages. A wider selection of applications include: automobile circuitry protection, overcurrent surge protection of high reliability electronic equipment, robust resettable fault protection for industrial transportation, communication, security, and consumer electronic equipment. Type the code from the image. This link will direct you to a web page outside the Bourns app. Do you wish to proceed? Yes No. Contact Us Careers My Bourns.

Polyswitch resettable fuse

A resettable fuse or polymeric positive temperature coefficient device PPTC is a passive electronic component used to protect against overcurrent faults in electronic circuits. The device is also known as a multifuse or polyfuse or polyswitch. They are similar in function to PTC thermistors in certain situations but operate on mechanical changes instead of charge carrier effects in semiconductors. These devices were first discovered and described by Gerald Pearson at Bell Labs in and described in US patent 2,, A polymeric PTC device is made up of a non-conductive crystalline organic polymer matrix that is loaded with carbon black particles [2] to make it conductive. While cold, the polymer is in a crystalline state, with the carbon forced into the regions between crystals, forming many conductive chains. Since it is conductive the "initial resistance" , [3] it will pass a current. If too much current is passed through the device, the device will begin to heat. As the device heats, the polymer will expand, changing from a crystalline into an amorphous state. A small leakage current still flows through the device and is sufficient to maintain the temperature at a level which will keep it in the high resistance state. Leakage current can range from less than a hundred mA at rated voltage up to a few hundred mA at lower voltages. The device can be said to have latching functionality. The trip current is the current at which the device is guaranteed to trip. When power is removed, the heating due to the leakage current will stop and the PPTC device will cool.

If the current or temperature continues to increase at this time, polyswitch resettable fuse, the heat generated will be greater than the heat dissipated, causing the temperature of the resettable fuse to increase sharply. Request Report. A resettable fuse is composed of specially treated polymer and carbon black distributed inside.

I Classification. III Principle of Action. IV Technical Standard. V R esettable F use S election. VI Applications. Resettable fuses can be divided into 2 types according to materials:. Polymer PPTC ;.

Capacitors boosts the current and increases the power factor to an electrical motor. Search for the part s number you wish to receive samples. Or, visit the sample center page. PPTCs increase resistance as temperature increases due to increased flow. Designed to limit unsafe currents while allowing constant safe current levels, resistance will "reset" automatically when the fault is removed and temperature returns to a safe levels. Surface mount resettable PPTC devices provide overcurrent protection for applications where space is at a premium and resettable protection is desired. Package size varies from to , while hold current ranges from 50mA to 7. Radial leaded resettable PPTCs are designed to provide overcurrent protection for applications where space is not a concern and resettable protection is preferred. Battery strap resettable PPTCs provide reliable, non-cycling protection against overcharging and short circuits events for rechargeable battery cells where resettable protection is desired. The Telecom resettable PPTC Series is designed to protect against short-duration high-voltage fault currents power cross or power induction surge typically found in telecommunications and networking applications.

Polyswitch resettable fuse

A polymeric positive temperature coefficient device PPTC is a passive electronic component used to protect against overcurrent faults in electronic circuits. Simply put, a PPTC device, also known as a multifuse or polyfuse or polyswitch, is actually a resettable fuse! Positive temperature coefficient PTC resettable fuse is a circuit protection device which provides overcurrent and overtemperature protection in a variety of applications. A PTC resettable fuse can open electric circuits during fault events like a traditional one-time fuse, but is automatically resettable. A PTC fuse consists of a positive temperature coefficient material whose internal resistance increases exponentially with an increase in operating temperature. In the ON state tripped state , the device offers very high resistance in response to faults such as short-circuit or overheat, thus limits the current flow through the device until the material cools, then reverts to low resistance mode. In the OFF state idle state , the device maintains a low resistance as the current is within a safe range www.

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Hot and Cold Impact Test At room temperature, the test result of the resistance value of the polymer PTC resettable fuse before and after the temperature cycle. Products Products Blog Components. Radial leaded resettable PPTCs are designed to provide overcurrent protection for applications where space is not a concern and resettable protection is preferred. Newbery January How satisfied are you with the content? Search for the part s number you wish to receive samples. The chart below is meant as a quick guide in narrowing to a Littelfuse PPTC device that may be appropriate to certain end applications. Generate New Image. Designed to limit unsafe currents while allowing constant safe current levels, resistance will "reset" automatically when the fault is removed and temperature returns to a safe levels. Archived from the original PDF on 22 January It's the maximum operating current of the polymer PTC resettable fuse for safe operation in the limited state, that is, the current withstand value of the thermistor. The allowable failure mode is an open circuit or a high resistance state, but there must be no low resistance state or open flame during the entire test. The device can be said to have latching functionality. At this time, the resettable fuse is in a low resistance state , and the heat generated by the current flows through the resettable fuse is small and does not change the crystal structure. MF-SD Label.

A resettable fuse or polymeric positive temperature coefficient device PPTC is a passive electronic component used to protect against overcurrent faults in electronic circuits.

During an overcurrent event, a Polymer PPTC will heat and expand, which in turn causes the conducting particles to break contact and stop the current. Products Automotive Sensors Automotive Sensors Littelfuse Automotive Sensor Products offer a wide range of sensors for use in monitoring various vehicular functions in the areas of passenger safety, comfort and convenience plus vehicle powertrain, chassis and emission applications. The main advantage of ceramic CPTC is that it is cheap and easy to manufacture. Tools Tools. We use cookies to collect information about how you interact with our website and to remember you. Products New Products. This is the average opening time for that device. I Classification. Lead plug;. The key to the mobile phone battery pack lies in its own application characteristics. Share this post. When the applied voltage disappears, the resettable fuse can recover automatically.