RHEF750 Circuit Protection

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PTC resettable fuses, also known as Polymer Positive Temperature Coefficient (PPTC), are used extensively in electronic applications offering over-current protection. Unlike standard fuses that react to an overload and blow, causing possible damage to equipment, PTC resettable fuses are able to respond to an overload with a slight increase in resistance until the overload has passed. The fuse then immediately returns to its original low resistance.

RHEF750 is a Polymer Thermal Fuse, a new generation of resettable Polymeric Positive Temperature Coefficient (PPTC) fuse designed specifically for consumer electronics applications. With its very low internal resistance, RHEF750 PPTC resettable fuse provides superior over-current protection and is ideal for products such as Laptop, mobile devices, DVRs, Televisions, etc.

RHEF750 is a small and compact fuse that has a wide range of application fields, including automotive, telecommunication, LED lighting, consumer electronics, medical, instrumentation and a number of other industries. It provides superior current limiting performance and excellent thermal stability for efficient and reliable protection. The RHEF750 enables fast event response times with high precision and reliability while maintaining quality ratings regardless of operating temperature.

The working principle of the RHEF750 is based on the PPTC technology. The PPTC has a positive temperature coefficient, which means that the resistivity increases as temperature increases. When the RHEF750 is subject to an overload, the fuse will reach its rated temperature quickly and the resistivity of the PPTC element will rapidly climb up, thus reducing the current to a safe level.

In normal operation, the RHEF750 will have a low resistance that is ideal for allowing maximum current to flow through the fuse. As the current passing through the fuse increases, the resistance of the PPTC element will rise until it is approximately equal to the applied voltage. At this point, the current flowing through the RHEF750 will be limited, effectively protecting the equipment being powered.

Once the event is complete, the fuse will automatically reset itself and the resistance will return to its original low resistance state. This is one of the major advantages of the RHEF750 PPTC resettable fuse compared to traditional fuses. The ability to reset after an overload provides an additional layer of protection and potentially costly repairs.

The RHEF750 PPTC resettable fuse is able to offer superior over-current protection while maintaining an extremely low internal resistance. This makes RHEF750 an ideal choice for applications where size, weight and cost are important considerations. The RHEF750 provides quicker event response times, along with the protection of its resetting ability, making it a great choice for a variety of applications.

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