The protector monitors the line voltage in real time and compares it to an internally set voltage range.
If the voltage is detected to be above or below the set value, the internal relay activates, shutting off the power supply. When the voltage returns to normal, it automatically delays and reconnects the circuit, without requiring human intervention.
No. Circuit breakers and overvoltage and undervoltage protectors provide different protections. Circuit breakers primarily interrupt short-circuit currents, tripping to protect equipment when a short-circuit occurs. Overvoltage and undervoltage protectors, on the other hand, operate when they detect system voltage anomalies (over- or under-voltage). While the two functions complement each other, they cannot replace each other.
Common single-phase overvoltage and undervoltage protectors are typically suitable for 220V AC voltage and 50Hz frequency, with rated operating currents of 40A and 63A.
The overvoltage trip value is typically around AC 270V, and the undervoltage trip value is around AC 170V. Parameters such as the recovery voltage and power-on delay after a power outage vary depending on the specific model and standard.
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