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How do you select metal oxide varistor?
For most applications, the selection is a five-step process: 1. Determine the necessary steady-state voltage rating (working voltage) 2. Establish the transient energy absorbed by the varistor 3.
Which of the following circuit conditions does a metal oxide varistor MOV protect against?
The Metal Oxide Varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges. When exposed to high transient voltage, the MOV clamps voltage to a safe level.
What is the function of metal oxide varistor?
Metal Oxide Varistor Applications Metal oxide varistors are used to protect voltage spike, over-voltage, line to line, arching, and switching. These varistors can be used to protect different kinds of devices from faults. These are used for single-phase L to L, a line to ground protection within electrical circuits.
How does a metal oxide varistor fail?
This failure mode can be caused by long-duration overvoltage, such as switching from a reactive load or thermal runaway of the MOV connected to the ac mains. In high current conditions the zinc oxide junctions of the MOV begin to degrade resulting in a lower measured MCOV or turn-on voltage.
How does a metal oxide varistor ( MOV ) work?
What is a MOV (Metal Oxide Varistor)? MOV is simply a variable resistor, but unlike potentiometers, MOVs can change its resistance based on the applied voltage. If the voltage across it increases the resistance decreases and vice versa.
What kind of resistor is a metal oxide varistor?
A Metal Oxide Varistor or MOV is the blue or orange-colored circular component that you can commonly spot on the AC Input side of any Power Supply Circuit. The Metal Oxide Varistor can be considered as another type of variable resistor that can vary its resistance based on the applied voltage across it.
How to find the part number of a varistor?
Here’s the datasheet. Measure its diameter and lead distance, you can find it in the datasheet. I think its part number is this: B72205S0381K101 Metal OXide Variators (MOV) or now generically referred to as SIOV’s are commonly rated by their RMS withstanding voltage or 385Vac in this case, then above this by a Joule rating 05 (which seems low).
How are metal oxide variators rated and rated?
Metal OXide Variators (MOV) or now generically referred to as SIOV’s are commonly rated by their RMS withstanding voltage or 385Vac in this case, then above this by a Joule rating 05 (which seems low). then followed by a date code YYWW for year and week.