RKEF400

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PTC Resettable Fuses, or polymer-positive temperature coefficient (PPTC) fuses, are semiconductor devices used to protect electronic components from excessive currents or power failures. The RKEF400 series of PPTC fuses are ideal for a wide range of applications, offering a host of advantages, and have a wide operating temperature range from -40 to 85°C.

The RKEF400 is a general purpose device, made of a conductive polymer. Unlike traditional fuses, the RKEF400 is designed to allow for cyclic over-current protection without the added expense of a replaceable fuse element. This makes it well-suited for power supply and motor applications exposed to regular and occasional overloads in industrial equipment, lighting fixtures, and other electronics. When subjected to an over-current, the PTC will increase its resistance to a point where it will safely regulate the current up to its maximum over-current rating. Once the over-current is gone, the PTC fuse will cool and will reset itself to its original low resistance state, ready to be used again.

The working principle of the RKEF400 PTC resettable fuse is based on the properties of a semiconductor material. When a fault current flows through the fuse, the temperature of the fuse increases and the resistance of the fuse will also increase. This increased resistance in turn causes a reduction in the current flowing through the fuse. As a result, the temperature of the fuse will reduce and the resistance will drop back to its normal state, allowing the current to flow normally.

The RKEF400 series of PPTC fuses are UL recognized and available in a variety of configurations, including surface mount, through-hole, and in-line. The series is also RoHS-compliant and offers fast hold time, low voltage drop, and high breaking capacities. It has a wide operating voltage range of up to 30V and a wide variety of current ratings from 2.0A to 400A. All the components are UL-approved and current ratings are available from 1A to 400A. The RKEF400 series of PTC fuses is simple to install and use, offering enhanced safety and performance benefits for electronic systems.

The RKEF400 series of PPTC fuses is a popular and cost-effective way to protect electronic components from over-current damage or power failure. The ability to reset the device by simply removing the over-current is especially beneficial for applications that require frequent over-currents. The device\'s high resistance during over-current events also makes the RKEF400 an ideal protection choice against nearby lightning or power surges. It\'s a versatile and dependable solution to the challenges of electronic over-current protection.

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