Can arc-flash relays provide an alarm when arcing faults occur?

The assertion that arc-flash relays do not provide an alarm when arcing faults occur is not accurate.

Arc-flash relays are specifically designed to detect arcing faults and can indeed provide an alarm or initiate protective actions in response to these dangerous conditions. Their primary function is to help mitigate the risks associated with arc flashes by quickly detecting the presence of an arc and responding appropriately—typically by tripping the circuit to cut power or alerting personnel to the hazard.

While it's true that not every installation may configure the relays to activate an alarm, they are inherently capable of doing so based on their design and programming. Thus, it would be incorrect to say they are not designed for this purpose at all.

Some arc-flash relays may be configured only to monitor specific devices or systems, but the broad capability to provide alarms is a key function of these devices. Therefore, if you think about the context of electrical safety and the role of arc-flash relays, this capability is essential for enhancing safety in the workplace.