What is required to replace a faulty varistor?

To replace a faulty varistor, utilizing a duplicate with the same or close clamping voltage rating is essential for proper functionality and safety. The clamping voltage specification indicates the maximum voltage the varistor can withstand before it begins to conduct electricity significantly, protecting the circuit from voltage spikes. If a replacement varistor has a clamping voltage that is too high, it may not activate in a surge, allowing potentially damaging over-voltage conditions to reach sensitive components. Conversely, a clamping voltage that is too low could lead to premature failure of the varistor under normal operating conditions.

Using the same or close clamping voltage ensures that the varistor responds appropriately to voltage surges while staying reliable during standard operation, effectively balancing performance with protective qualities. This careful selection is critical in maintaining the integrity of the overall electrical system and preventing further issues down the line.