Eaton – Arc-Flash Relay System

The Eaton Arc Flash Relay (EAFR) system is a combination of arc flash relay modules and sensors designed to detect and clear arc flash events in low and medium voltage electrical assemblies.

An arc fault is the most devastating type of fault in medium voltage (MV) and low voltage (LV) switchgear. If an arc fault occurs, the EAFR system reduces arc energy by quickly clearing the current feeding the arc. The EAFR system can measure both light and current to eliminate nuisance operation. In addition, it’s modular design makes it an excellent candidate for both new and retrofit installations.

The EAFR system is a sophisticated micro-processor based arc flash protection system with combined current and arc sensing. Combined current and arc sensing provides an integrated dual trip criteria. It is designed to minimize the damage caused by an arcing fault (arc flash) by tripping the circuit breaker sourcing the fault current.

The main units EAFR-110F and EAFR-110P each contain four current transformer inputs that provide sensing for the phase and ground instantaneous overcurrent elements. These elements act as a permissive for the light sensing inputs so that when they are incorporated into the scheme both current and light must be present to initiate a trip com¬mand. This current information can be shared with down¬stream modules as well.

Arc flash light can be collected by either point sensors or fiber loop sensors. Up to 12 point sensors or 3 loop sen¬sors can be connected to each module. Light sensing can initiate a breaker trip independent of current if desired. Because point sensors are interconnected with copper wire they can provide a much better installation for Electrical OEM’s where the system can be fully wired and tested in the factory. Sensor wiring allows daisy chaining up to three sensors over a distance of 100 meters. Fiber loop sensors are available in either plastic or glass versions. Point sen¬sors are available in multiple sensitivity levels with the 8K lux sensor being suitable for most applications.

  • Used to securely join EMT to two armored cables. A labor savings, compared to the traditional junction box installation.
  • Fast, neat installation without a junction box.
  • Safely transitions 14/2 to 10/3 AC/MC conduits to EMT conduit without damaging insulation.
  • cULus Listed File No. E20534

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