EATON Arc Flash Relays

What is an arc flash?

An arc flash is a sudden release of energy caused by an electric arc which can cause fire or explosion if not interrupted in time.

How to install point sensors?

• Point sensors can be installed either on or through the compartment wall using two screws.
• In this arrangement, the unit turns around and the sensor's point protrudes through a small hole cut in the wall.
• This allows the body of the sensor and cabling to be located outside the compartment to be protected.
• The screws are attached from the back side of the sensor to firmly fix the unit.
• No external mounting plates are needed during the installation.

What is the difference between AFDD and AFR-type flash relays?

• AFDD (arc flash detection device) is a type of relay that uses current and voltage sensors to detect an arc flash and send a signal to the breaker to trip.
• AFR (arc flash relay) uses a combination of current, voltage and thermal sensors to detect an arc fault and interrupt the current by tripping the breaker closest to the arc flash.