Pptc fuse

These components remove the need for any temperature-based nuisance tripping across pptc fuse 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, pptc fuse, and consumer electronic equipment.

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.

Pptc 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. 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. Traditional Fuses vs. Understanding the differences between the two technologies should make the choice in selection easier, depending on the application. The most obvious difference is that PPTCs are automatically resettable whereas traditional Fuses need to be replaced after they they are tripped.

This is the average opening time for that device.

.

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. Markets Markets. Discover the optimal solution for your specific application.

Pptc 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. In other words, a PPTC fuse reaches a high resistance with a low holding current under fault conditions and reverts back to a conductive state after the current is removed, acting more like a circuit breaker, allowing the circuit to function again without replacing anything. Note at this point that a PPTC device has a current rating so that when the current flowing through the device exceeds the current limit, the PPTC device warms up above a threshold temperature and the device is tripped to cut off the current flow over the circuit.

Maturesanal

This link will direct you to a web page outside the Bourns app. Archived from the original PDF on 22 January This fault current level is the maximum current that the device can withstand safely, keeping in mind that the PPTC will not actually interrupt the current flow see Leakage Current above. These cookies enable us to improve our website, for instance, by ensuring that users are finding the required information. If your overload current falls to the right of the curve the device will open. The temperature rerating curves in the table below compare PPTCs to fuses and illustrate that more rerating is required for a PPTC at a given temperature. Read Edit View history. A reduction in ambient temperature will increase the trip current as well as the hold current. When a PPTC is in a "tripped state" it protects the circuitry by limiting the current flow to a low leakage level. Or, visit the sample center page. News Never miss an update.

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.

When you use our website, we collect personal data about you and your use of the Website, through cookies and analytics tools. The device can be said to have latching functionality. Surface mount resettable PPTC devices provide overcurrent protection for applications where space is at a premium and resettable protection is desired. Customized and DC Motor Series. Due to the higher data rates of USB 2. Click on the different category headings to learn more and change default settings. PPTCs are rated for a maximum short circuit current at rated voltage also known as "breaking capacity" or Imax. While cold, the polymer is in a crystalline state, with the carbon forced into the regions between crystals, forming many conductive chains. Note: The application summary is for reference only. Mounting Style. These cookies are used to deliver advertising that may be relevant to you and your interests.