Dear K.Kittitouch,
If there is some problems on electrical network.
Protection relay detected fault and sent command to trip circuit breaker.
However, you can adjust delay time of relay to extend tripping time of circuit breaker about 3 – 8 seconds.
There are 2 LED indictors to display status on protection relay.
2 LED active same time = Unbalance phase
1 LED Top active = Over voltage
1 LED Bottom active = under voltage
When protection relay worked and main circuit is opened,,
It will disturb operation in your office but it will safe your electrical equipment such as motors.
Therefore, I recommend you to contact/inform MEA (metropolitan electricity authority) that electrical system is not stable.
And it is impacted to your business then they should improve stability of network.
Best Regards,
Kitkart Pitiwan