Polyswitch resettable fuse

A resettable fuse or polymeric positive temperature coefficient device PPTC is a passive electronic component used polyswitch resettable fuse 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, polyswitch resettable fuse. These devices were first discovered and described by Gerald Pearson at Bell Labs in and described in US patent 2,

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

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.

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

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. However, after power off and the failure has been eliminated, the device will return to its initial state without any manual operation.

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.

Nomv

Our surge protection devices SPDs and modules are designed to provide protection from transient overvoltage. 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,. In these materials, the PTC effect manifests as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect. Radial Leaded, Through-hole Series. Littelfuse, Inc. PPTCs hold and trip rating must be rerated when applied at conditions other than room ambient. Read Edit View history. 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. It could take hours, days, weeks or even years for the device to return to a resistance value similar to its original value, if at all. For detailed application assistance please visit our Application Design Center Site. These cookies allow our website, applications and services to remember choices you make such as your preferred language and provide enhanced, more personal features. Chassis Comfort and Convenience. If the device does not open soon enough, the overcurrent may damage downstream components. 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. Select a PTC 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.

Maximum Working Environment Temperature The highest ambient temperature at which the component is expected to work safely. A PPTC device has a current rating and a voltage rating. I Classification. They are also used to limit the number of times you see an advertisement as well as help measure the effectiveness of an advertising campaign. A resettable fuse or polymeric positive temperature coefficient device PPTC is a passive electronic component used to protect against overcurrent faults in electronic circuits. V R esettable F use S election. Magnetic sensing products utilizing Reed and Hall Effect technologies, with custom solutions available. Share this post. Note: The application summary is for reference only. Upon fault current being removed, the resettable fuse cools and its resistance drops to the original extremely low value. Action Time. Ceramic CPTC. EC Circuit Protection of USB 2 0 This application brief demonstrates how to ensure reliable and safe circuit operation of USB products, protection against voltage and current transients must be carefully considered. The trip current is the current at which the device is guaranteed to trip. 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.