FBMOV150M

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A MOV (Metal Oxide Varistor) is one of the common types of Varistors (Voltage-dependent Resistors). MOVs are also referred to as VDRs (Voltage-Dependent Resistors) or varistor discs. MOVs have the capability to reduce overvoltages and limit the flow of surge currents. One of the commonly used varistors is FBMOV150M. This article delves into the application field and working principle of FBMOV150M.

Applications of FBMOV150M

MOVs are typically implemented in power supplies and motor controllers as a surge protection device. The FBMOV150M series of MOVs is designed for use in AC applications up to 150VAC. It is commonly used in applications such as:

• Home electrical appliances
• TVs
• High end audio equipment
• Communication and computer systems
• Security systems
• Lighting systems
• Power supply controllers
• Medical machines
• Household electronics

Working Principle of FBMOV150M

An FBMOV150M Varistor is a two-terminal component, with one side being the cathode and the other being the anode. It acts as a voltage-dependent resistor, meaning it has a low resistance when the voltage is within tolerable limits but its resistance increases when the voltage exceeds the specified nominal value. MOVs are constructed out of zinc oxide pellets which are electrically joined and encapsulated in an epoxy mould.

The resistance of the MOV is determined by its structure. When the voltage applied across the terminals is within the acceptable limits, the resistance of the MOV is comparatively low. As soon as the voltage applied exceeds the specified maximum rating, the resistance of the MOV increases exponentially. This high resistance quickly diverts the surge current away from the power supply and into the MOV where it is safely discharged without any damage to the power supply.

Conclusion

The FBMOV150M series of MOVs is ideally suited for use in various AC applications with voltages up to 150VAC. It is a two-terminal component, with one side being the cathode and the other being the anode. As voltage is applied to the terminals, the saturation of the zinc oxide pellets increases exponentially and thus its resistance increases, diverting the surge current away from the power supply and into the MOV.

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