RHEF750-AP

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PTC resettable fuses, also known as polymeric positive temperature coefficient resettable fuses, are self-resetting current limiters for use in a broad array of consumer and industrial applications. The RHEF750-AP is an ideal solution for providing application specific and cost efficient current limiting protection for low energy products. It features an SMD design for easy PCB mounting. This article examines the application field and working principle of the RHEF750-AP.

The RHEF750-AP is designed for use in low energy consumer products, such as LED lighting, USB charging ports, cell phone chargers and small mobile appliances, to provide effective over-current protection. It also has a low voltage drop (less than 100mV), making it especially suitable for battery powered applications. The fuse is available in a variety of current ratings ranging from 250mA to 2.5A. It is non-resettable, meaning that it will trip once the current reaches its rated limit. This ensures that the device circuit will not be damaged due to high current levels

The working principle of the RHEF750-AP is relatively simple. When the current passing through the device exceeds its rated value, the interface materialer will melt and disconnect the internal connections, causing an open circuit. This will cause an interruption in the electrical circuit as the entire internal resistive path is broken. This will restrict the over-current, thus protecting the device from damage. When the over-current is reduced or removed, the interface material will cool and re-establish the previous connection. This will restore the electrical connection and the device will function normally.

In addition, the RHEF750-AP also includes a number of thermal protection features which prevent thermal runaway. These features are designed to detect when the temperature of the device is rising faster than expected, and will open the circuit to protect the device from thermal overloads. This further ensures that the device circuit will not be damaged due to excessive current levels.

Overall, the RHEF750-AP is an ideal solution for providing current limiting protection for low energy products. It is a cost efficient and application specific way to ensure that devices are protected from over-currents. The device features an easy to mount SMD design and also provides thermal protection, giving it the flexibility to meet the needs of a wide range of applications. This article has examined the application field and working principle of the RHEF750-AP, highlighting its advantages and flexibility.

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