What is the difference between Vrrm and Vrm

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SUMMARY

The discussion clarifies the distinction between maximum reverse voltage (Vrm) and maximum repetitive reverse voltage (Vrrm) in rectifiers. Vrm represents the highest voltage that a device can withstand only once, potentially leading to damage if exceeded. In contrast, Vrrm indicates the maximum voltage that can be repeatedly blocked without causing harm, making it crucial for normal operating conditions. Understanding these differences is essential for ensuring the reliability of rectifiers in electrical applications.

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yugeci
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Hello,

I know peak inverse voltage is the maximum amount of voltage can block, and that it is the maximum value on the negative cycle of the sine wave. But what is the difference between maximum reverse voltage and maximum repetitive reverse voltage? What does the repetitive imply? Does the former mean the maximum voltage that can be blocked in single wave?
 
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The device can block the maximum reverse voltage just once (and probably only for short time). After that has happened, the device may be damaged so it does not meet the rest of its specification.

The maximum repetitive reverse voltage can be blocked repeatedly, any number of times, without causing any damage.

For a rectifier, the normal operating voltage should be less than Vrrm. Usually, Vrm is only relevant if there is a fault, for example if there was a lightning strike that hit the mains power supply and caused a voltage spike.
 
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Thanks. That explains it very well.
 

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