RKEF250

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PTC resettable fuses, also known as polymeric positive temperature coefficient, are devices used to protect electrical circuits from overcurrent conditions. In a positive temperature coefficient device, the resistance value increases when the temperature increases, which can prevent possible thermal runaway and safety hazards. The RKEF250 is a PTC resettable fuse manufactured by Nichicon, and it is primarily used in electronics, industrial, automotive, and consumer applications to protect system electronics from excessive or damaging current levels.

The RKEF250 is a radial-leaded fuse which comes in an across-the-line (AC line) application. Its construction includes a PTC material, a heater core, and copper wires. The PTC material helps to protect against overcurrent conditions, while the heater core handles thermal energy generated through increased current flow. The copper wires provide a contact path and increased conductivity.

RKEF250 works by automatically interrupting the circuit when an overcurrent is detected. This occurs when the current reaches a predetermined threshold, causing the PTC material to rapidly heat up and expand, breaking the connection within the heater core. This prevents further current flow and potential damage to the components in the circuit.

RKEF250 is designed to be used in power supplies, energy storage devices, such as batteries, and other equipment where overcurrent protection is necessary. The device is used for transient protection against short-term overcurrents, such as those caused by turns-on surge. Additionally, RKEF250 is rated for inrush currents of up to 8.1A @125Vac, and maximum peak operating current ratings of up to 7A @125Vac.

RKEF250 is intended as a quick, cost-effective solution for protecting equipment and circuitry from transient overcurrents without using traditional fuses. As a self-healing fuse, RKEF250 automatically resets when the overcurrent situation has subsided. This prevented the need to replace the fuse after use, and makes the device a viable alternative in situations where protecting the circuit from overcurrent is essential.

RKEF250 is also designed to be highly reliable and long-lasting. It offers an operating temperature range of -40°C to 125°C and is capable of withstanding over 1000 operations. Its maximum surge pulse life rating of 100 cycles ensures it can operate reliably even after repeated overcurrent events.

RKEF250 is the ideal solution for power supplies and other components that require reliable overcurrent protection. It is lightweight and compact, making it easy to install and transport. The device is also cost-effective, and its self-healing properties make it an ideal option for protecting expensive electronics from overcurrent damage.

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