HPF-RR

High Power Factor-Reactive Resistor (HPF-RR) is a popular electrical protection device used to protect electrical wiring from damage due to overloads. It is designed to limit the magnitude and duration of current that could cause an over-current situation. HPF-RR are also known as AFRs (Automatic Fuseless Resistor).

HPF-RR are primarily used in industrial, commercial and military applications where high current, overloads and surges have to be monitored and controlled. Within the same application field, HPF-RR can also be used to protect equipment by providing protection against other forms of over-current such as short circuit or ground fault. The HPF-RR provides a cost effective solution for high current management in such critical applications.

HPF-RRs can be used in many protection circuit designs to provide effective protection against overloads. They are available in a range of different sizes and shapes, depending on their application. They have an adjustable output impedance and can be lit up in a variety of colours as well, making them suitable for various designs. The most popular HPF-RRs are designed for use in fuseholders for high current protection.

Fuseholders are used to hold and protect the fuse element and its connection points in an electrical circuit. HPF-RRs can be used as a replacement for fuses in fuseholders providing reliable over-current protection without the need to replace the fuse element each time it trips. This saves time and money in maintenance costs compared to conventional fuses.

The working principle behind HPF-RR is based on a resistor-capacitor-combination with a passive circuit. When the current exceeds the threshold value, the resistor part limits the current flow, while the capacitor part holds the same energy produced by the excitation of the resistor. This results in a timing effect and an adjustable current limiting level. This is the basic principle behind HPF-RR protection.

When an over-current is detected, the HPF-RR activates the circuit breaker or opens a fuse automatically to limit the current to a safe level. This results in a significant reduction in energy and power loss in the circuit. These protective devices also play an important role in preventing possible over-voltage situations which occur when a short circuit occurs in an electrical system.

HPF-RRs are designed to reduce the risk of short circuits, reduce the occurrence of faults and protect people from being electrocuted due to over-currents. The types of HPF-RRs available depend on the application and the particular electrical system. It is important to choose an appropriate HPF-RR for the application field and the particular electrical system, since its selection and installation can have a lasting effect on the performance and safety of the system.

In summary, HPF-RR application field and working principles can help protect electrical wiring from damage due to overloads, as well as contribute to overall safety. They are usually used in fuseholders for high current protection, providing reliable over-current protection for critical applications. Thanks to its adjustable output impedance, they can be used in many protection circuits designs, making them an ideal solution for those systems that require robust protection.