New Circuit Protection Products

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Littelfuse has successfully completed its acquisition of the circuit protection business of TE Connectivity Ltd. The circuit protection business has a leading position in polymer-based resettable circuit protection devices. Littelfuse will continue to produce and sell PolySwitch® devices.

Littelfuse strengthens their position as an industry leader in circuit protection. By addressing product gaps in two highly technical target markets, battery management and automotive electronics. Littelfuse leads the way in the field of PPTC (polymeric positive temperature coefficient) products. The strength of the acquired circuit protection devices business in PPTCs complements the strength Littelfuse has in fuse technologies and enables them to offer a more comprehensive suite of products to customers.


PolySwitch polymeric positive temperature coefficient (PPTC) devices help protect against damage caused by harmful overcurrent surges and overtemperature faults. Like traditional fuses, these devices limit the flow of dangerously high current during fault conditions. The PolySwitch device, however, resets after the fault is cleared and power to the circuit is removed, thereby helping to reduce warranty, service and repair costs.


◾Portable electronics
◾Telephone and broadband
◾Industrial controls
◾Battery packs
◾USB hubs, ports and peripherals
◾HDMI ports
◾IEEE 1394 ports
◾Transformers and power supplies