RHEF070

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PTC Resettable Fuses are special components designed to help protect electronic circuits from damage due to excessive current, protecting consumers and their devices from damage due to electric current overloads and possible shock. The RHEF070 is a specific type of PTC Resettable fuse from Littelfuse, which are widely used in the industrial and consumer electronics market. This article will detail the application field and working principle of the RHEF070.

Application Field

The RHEF070 is a high speed, high current, polymeric PTC fuse used for circuit protection in transportation, automotive, industrial, and consumer electronics applications. It is designed for applications requiring either fast tripping or high current, including motor protection, power supplies, DC motor control, robots, lighting, LED decorative lighting, and industrial automation. With its high maximum continuous current rating and fast response time, the RHEF070 is also well suited for a wide range of portable devices and applications requiring high speed temperature sensing and control, including LED lighting, chargers, lamps, game consoles, cell phones, and more. It is also suited for applications which require excellent soldering performance and robust long-term performance.

Working Principle

The RHEF070 is a polymeric, resettable type fuse that has a temperature-sensitive element which reacts to the current passing through it. As the current increases, so does the temperature. When the current exceeds its rated value, the temperature of the element rises quickly and causes the fuse to open up and protect the circuit. Once the current has decreased, the fuse can be reset in order to restore the current.

The RHEF070 works as a series element in a circuit, meaning that it is placed between two points in the circuit – such as a positive and negative connection. It must then be connected to a temperature sensing device such as a thermistor, a temperature-sensitive resistor, or a thermal switch that can detect when the temperature surrounding the fuse has reached a predetermined temperature. When the predetermined temperature is reached, the circuit is automatically interrupted and the current is cut off.

The RHEF070 is also equipped with a bridge element which further helps to protect the fuse from external electric shocks and power surges. The bridge element acts as an isolation device which isolates the circuit from power line disturbances.

Conclusion

The RHEF070 is an extremely useful type of PTC Resettable Fuse which provides an efficient and economical way of providing reliable circuit protection in a variety of different types of applications. It is well suited to applications requiring fast tripping and high current, and is also well suited for applications requiring excellent soldering performance and robust long-term performance.

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