PPTC/Zener Diode Devices protect consumer electronics.

Combining Zener diode and resettable PolySwitch PPTC device in 4.0 x 5.0 x 1.2 mm package, PolyZen ZEN056V230A16YC and ZEN056V260A16YC simultaneously protect against damage from overload, overcurrent, reverse-bias, ESD, and overtemperature events. Hybrid units offer up to 2.6 A hold-current at room temperature,

[source: http://news.thomasnet.com/fullstory/PPTC-Zener-Diode-Devices-protect-consumer-electronics-20035462]