PTC Resettable Fuses

Eaton PTC Resettable Fuses are designed to protect sensitive components from overcurrent and overtemperature conditions that can occur due to power surges, electrical transients, high ambient temperatures, and more. The PTC fuses are based on a unique positive coefficient material whose internal resistance increases exponentially due to overcurrent conditions and higher temperatures. High resistance offered by the fuse during a trip prevents current from flowing through the circuit until the fault current/over-temperature source is removed and falls below the design current/temperature limit. Once the fault current is removed or the ambient temperature cools, the fuse re-enters its conducting state, allowing the current to flow through the circuit again. These components ensure constant uptime in applications where using one-time fuses would be impractical or expensive, including battery-powered devices, industrial controllers, medical devices, and I/O ports of consumer electronics.