Protective relays and predictive devices

Eaton’s Arc Flash Relay (EAFR) provides unmatched switchgear protection. This relay reduces arc flash energy by quickly clearing the current feeding the arc. The sensitive light inputs with current permissive detection identify low power phase to ground arc faults. The EAFR works to prevent faults in medium and low-voltage switchgear, and the factory-installed Arc Flash Relay modules and sensors allow for simple integration into electrical assemblies.

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Introducing Eaton's arc flash relay system

Arc flash relay core features

Protection features

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.

Three phase instantaneous overcurrent elements (50P) (Permissive only with light input)
Ground instantaneous overcurrent element (50G) (Permissive only with light input)
Breaker failure (50BF)

Current sensing

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 command. This current information can be shared with downstream modules as well.

Light sensing

Arc flash light can be collected by either point sensors or fiber loop sensors. Up to 12 point sensors or 3 loop sensors 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.

Point sensors: Up to 12 sensors per module
Fiber loop sensors: Up to 3 sensors per module

Relay outputs

Four Trip Relays per module (7 mS)
Two High Speed outputs (2 mS – EAFR-110P, EAFR-110F)
System failure relay

Indication

Power available LED
System health LED
Trip relay activation LED’s
Sensor channel activation LED’s
Overcurrent element pickup LED’s

Self monitoring

Complete system self monitoring provides the highest level of dependability by continuously monitoring all internal system functions along with external connections between modules, light sensors or loops and current transformers.

Breaker failure

The circuit breaker failure protection (CBFP) is initiated when a light signal and second trip criteria signal (e.g. overcurrent), if applicable, is active for above the set CBFP time of either 100 or 150 ms. The trip relay T2 and binary output BO1 will operate after the set time delay

Communications

Because of the simplicity of the system, all monitoring is done through contact outputs on the modules. The advantage of this approach is that cybersecurity issues are nonexistent.

Configuration

Easy configuration and setup with 4 dip switches to select one of many different standard sensor channel configurations for Light or Light & Current tripping.

Connecting and programming Eaton arc flash relay systems

The Eaton arc flash relay system is simple to set up and configure. In order to guide you along the process, we have created a set of instructional videos that walk you through connecting, programming and verifying that the system is configuring as you need it.

Arc flash relay instructional videos

Help improve your worker safety

Eaton's arc flash relay is designed to rapidly detect and clear the most difficult forms of arc flash events, reducing the arc energy in low-voltage and medium-voltage electrical assemblies.

Improve your reliability and efficiency

As demand for uptime and productivity in oil and gas, utility, manufacturing and infrastructure increases, Eaton's arc flash relay system can help improve the reliability and efficiency of your critical systems and processes.

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Support from Eaton

Technical Support Information

For support on any aspect of the product or installation process contact our Customer Integrity Team:

Email: mrsupport@eaton.com
Phone: 1-844-435-8982

Pricing, Availability and expedites (Eaton Care)

Email: CSCAveryCreek@eaton.com
Phone: +1 877-386-2273 (Option 1, Option 3)
Hours: Monday to Friday 8:00 AM to 7:00 PM EST

For more information

Arc flash relay

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Email the Customer Integrity Team

Or contact by phone at: 1-844-435-8982

Email Eaton Care for pricing, availability and expedite

Or contact by phone, Monday to Friday 8:00 AM to 7:00 PM EST at +1 877-386-2273 (Option2, Option 5, Option 1, and again Option 1)

Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.

Eaton arc flash relay