Polyswitch resettable fuse

I Classification. III Principle of Action. IV Technical Standard. V R esettable F use S election.

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.

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. As the device cools, it regains its original crystalline structure and returns to a low resistance state where it can hold the current as specified for the device.

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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.

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.

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. 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.

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Ensure that Umax and Imax are greater than or equal to the maximum operating voltage and maximum fault current of the circuit. PPTC thermistors should be packaged according to zero power resistance, and the resistance range should be marked on the outer package. Fuse Block, Fuse Holder and Fuse Accessories Fuse Block Fuse Holder and Fuse Accessories Littelfuse offers a comprehensive line of fuse blocks, fuse holders, and fuse accessories for automotive, electronic, and electrical markets. Common Mode Noise Filters CMF attenuate common mode noise in differential and balanced transmission, and power supply and audio lines. Electronic Testing Services. An electric fuse is a current interrupting device that protects the electrical circuit, in which it is located by generating an open circuit in response to excessive current. If the device opens too soon, the application may experience nuisance operation. There are cookies which are needed for our website, applications or services to function properly. Available Upon Request. Metal Hybrid Protection.

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.

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. Browse this column to find a value equal to or greater than the standard operating current of the circuit. Reliable standard and thermal protected varistor, available in a variety of forms, surge current capability up to 70, Amp. 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. Request Report. Conductive Polymer. They may also be used to provide services you have asked for. Check distributor stock levels by entering in full or partial part numbers Cancel. Provide a complete, one-piece solution for easy procurement and code compliance. Need the Littelfuse equivalent to a competitor part? 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. Action Current Itrip It's the minimum steady-state current that enables the resettable fuse series polymer thermistor to operate within a limited time under limited environmental conditions,. If your application requirements fall outside of our product range, in certain instances we can offer customized solutions.