Circuit & System Protection


Resettable fuses improve reliability at lower cost

25 October 2000 Circuit & System Protection

Polymer positive temperature coefficient (PPTC) fuses have provided designers in numerous industries a new tool in their battle to improve product quality and performance while at the same time reducing total installed cost.

As PPTC fuses are resettable, warranty costs and service calls are largely avoided. Since they do not need to be serviced, they can be used as embedded circuit protection devices.

Based on PPTC technology, Bourns' multifuse resettable fuses are packaged in radial leaded, surface mount, axial leaded 'battery strap' and uncoated disk form and have a wide range of power ratings. With this comprehensive selection of packages and power ratings, a multifuse resettable fuse will virtually always be able to meet your application requirements.

There are many applications for multifuse resettable fuses in a variety of market segments, including:

* Computers and peripherals: Circuit protection in desktop, laptop, notebook computers and peripheral devices is growing increasingly complex and important. Overcurrent protection applications for hard disk drives; keyboard and mouse ports; SCSI interface ports; SCSI adapter cards; audio and video cards; Ethernet and Token Ring LAN ports and adapter cards; cooling fan motors; and USB.

* Battery applications: Since batteries are important components of today's diverse array of portable equipment, protection of the battery pack is essential to keep the system up and running.

* Automotive: Automotive manufacturers continue to design more powered accessories such as seats, antennas, mirrors and windows into their vehicles. With added features comes the added complexity of wiring harnesses, motors, the electronics that control them, and the protection required to make them safe.

* Industrial controls: PPTC resettable fuses are low-resistance, resettable overcurrent protectors which may be placed in series with the input and output lines of a pressure sensor to protect the electronics. This is especially important for sensors which need to work in gaseous environments and must be explosion-protected.

The fact that these protection devices reset automatically sets them apart among circuit protection devices. Further, the nuisance factor of replacing blown fuses is eliminated.



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