How is under or over voltage condition indicated in manual voltage regulators?

In manual voltage regulators, an under or over voltage condition is typically indicated by an indicator light. This system provides a straightforward visual alert that is easy to interpret, allowing users to quickly ascertain whether the voltage is within acceptable limits. If the voltage strays outside the designated range, the light will activate to signal the abnormality, facilitating prompt action by the operator.

Indicator lights are favored for their simplicity and immediate recognition, making them effective in settings where quick responses to voltage regulation issues are critical. While other methods like audible alarms, digital readouts, or color alerts may also be used in various systems, the straightforward nature and effectiveness of an indicator light in conveying voltage status make it the most common choice in manual regulators.