RHEF900-2

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PTC Resettable Fuses are used to protect against overcurrent and short-circuit conditions as well as to guard against any type of leakage or disruption in the power supply. The RHEF900-2 in particular is one of the most commonly used devices for a variety of applications. This article will discuss the various application fields and working principles of the RHEF900-2.

Applications

The RHEF900-2 is widely used in a variety of applications such as switchgear, motor controllers, electrical measuring instrument, UPS systems, solar power systems and electric bicycles. Due to its low price and small size, it is often found in consumer electronics such as cell phones, laptops, and tablets. It is also useful in protecting high-voltage power transmission lines from shorts and leakage that could lead to accidents or failures.

Working Principle

The RHEF900-2 consists of a polymer-based sensing element that forms a thermal-sensitive switch, and a metal contact point. When an over-current situation is detected, a temperature rise is created in the sensing element, which then trips an internal switch. This switch opens the circuit and prevents any further current from flowing. After the current is cut off, the sensing element slowly cools, and the internal switch is returned to the “on” position. Thus, the device can be reset without having to be physically replaced.

Other Features

The RHEF900-2 also has other features that make it advantageous compared to other resettable fuses. It has a higher current rating than fuses that require physical replacement after each reset. Additionally, the RHEF900-2 has a large operating temperature range, and it does not require any external support circuitry, which reduces its costs. Furthermore, it has a very fast reaction time, and it is less susceptible to electrical noise interference.

Conclusion

The RHEF900-2 is a useful device in a variety of applications. Its fast reaction time and high current ratings make it advantageous compared to other resettable fuses. It is a cost-effective solution and does not require any external support circuitry. Finally, its wide operating temperature range and resistance to electrical interference contribute to its usefulness in various applications.

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