ROV05H470K-S

The ROV05H470K-S, manufactured by EPCOS,is a multilayer varistor (MLV) that is available in the form of an SMD disc with dimensions of 5mm x 9.6mm. This MLV is designed to protect against high-energy impulses in applications with rated voltages up to 450VAC or 600VDC. In general, this type of MLV works on the basis of the voltage-clamping protection, in which the device provides a lower cost and higher reliability when compared with other impulse protection components.

Application Field

The ROV05H470K-S is suitable for a variety of applications that require short-circuit protection and AC/DC surge suppression. A few of the typical applications in which the ROV05H470K-S can be used are data and signal lines, cell phones, personal computers, optical networks, commercial and industrial equipment, communication networks, telecommunications equipment, and automotive systems. The device typically operates on both AC and DC voltages up to 600V and can handle up to 200V for over-voltage protection.

Working Principle

The ROV05H470K-S works on the principle of voltage-clamping protection. At normal frequencies, the varistor acts like an open switch. However, when the varistor is subjected to excessive voltage or current, the voltage-clamping protection mechanism comes into action. The varistor shunts away the excess energy to the opposite terminal of the device, reducing the voltage seen by the connected circuit or equipment to a safe level. This protects the load and prevents damage from occurring due to overvoltage or overcurrent.

The ROV05H470K-S is constructed with multiple layers of zinc-oxide (ZnO) which are sandwiched between two metals. When a voltage surge occurs, the ZnO material generates a strong electrostatic field which generates a current flow in the opposite direction. This current flow absorbs part of the surge, reducing the voltage and protecting the load. The voltage that can safely be handled by ROV05H470K-S is up to 450VAC or 600VDC, and its peak pulse current handling capabilities are 5ka.

Conclusion

The ROV05H470K-S is an ideal solution for overvoltage protection applications. It is a compact, economical, and reliable MLV varistor with high peak pulse current handling capabilities. It works on the principle of voltage-clamping and is suitable for a wide range of applications such as data and signal lines, cell phones, personal computers, optical networks, commercial and industrial equipment, and automotive systems.