What applications use arc-flash relays?

How do arc-flash relays make your facility safer?

Video transcript:

Littelfuse arc-flash relays lead the way in arc-flash reduction technology. Arc-flash technology that can make your facility safer.

Arc-flash relays use reliable light detection to quickly sense an arc-flash and trip the circuit breaker in milliseconds. Adding Littelfuse arc-flash relays to existing switchgear is fast and easy. They’re plug and play. Any combination of point and fiber optic sensors can be used to provide maximum coverage.

Arc-flash relays can substantially reduce the amount of incident energy in an arc-flash, making switchgear safer and reducing the amount of PPE needed. They are the optimal solution to meet new NEC code changes for active arc-flash mitigation with the shortest trip times.

Littelfuse has a family of arc-flash relays to fit almost any situation. Arc-flash relays are a very cost-effective way to significantly decrease the risk of arc flash and make your facility safer.

Littelfuse. Expertise Applied. Answers Delivered.

Call our application experts at (800) 832-3873 to get more information.

AF0100 Arc-Flash Relay Application Guide

The AF0100 is a microprocessor-based protection relay that limits arc-flash damage by using light sensors to rapidly detect the arc and then trip a circuit breaker. Sensors, inputs, and trip-coil voltage are monitored to ensure fail-safe operation. A secondary solid-state circuit provides a redundant trip path in shunt trip mode. A USB port is used for configuration. The AF0100 can be used on electrical systems operating at any voltage (AC or DC) since it does not directly connect to the system. The small size of the AF0100 allows installation in any switchgear cubicle, transformer compartment, generator control panel, or motor control center bucket.

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AF0500 Arc-Flash Relay Application Guide 

The AF0500 is a microprocessor-based protection relay that limits arcflash damage by using light sensors to rapidly detect the arc and then trip a circuit breaker. Sensors, inputs, and trip-coil voltage are monitored to ensure fail-safe operation. A secondary solid-state circuit provides a redundant trip path. A USB port is used for configuration and access to event logs. The AF0500 can be used on electrical systems operating at any voltage (AC or DC) since it does not directly connect to the system. The small size of the AF0500 allows installation in any switchgear cubicle, transformer compartment, or motor control center bucket.

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PGR-8800 Arc-Flash Relay Application Guide 

The PGR-8800 is a microprocessor-based protection relay that limits arc-flash damage by using light sensors to rapidly detect the arc and then trip a circuit breaker. Phase current-transformer inputs are provided for current-supervised arc-flash protection and can also be used for definite-time overcurrent protection. Sensors, inputs, and trip-coil voltage are monitored to ensure failsafe operation. A secondary solid-state circuit provides a redundant trip path. A USB port is used for configuration and access to event logs. The PGR-8800 can be used on electrical systems operating at any voltage (AC or DC) since it does not directly connect to the system. The system is monitored with light sensors and optional current transformers (for AC systems) that can be selected for any current rating. The small size of the PGR-8800 allows installation in any switchgear cubicle, transformer compartment, or motor control center bucket.

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AF0100 Arc-Flash Relay - Generator Application Guide

Generators are often used to ensure continuity of energy for mission-critical applications. There are five key reasons generators are vulnerable to arc flash and this guide explains how to mitigate this risk.

  1. The high levels of energy from the generator and low impedance (due to being near the energy source) put the generator at risk.
  2. Many mobile generators are used in cooling applications in warm, humid, and sometimes dusty geographies where the increased conductivity of the air that’s insulating the exposed conductors can increase the risk of an arc flash.
  3. Mobile generators used in cold environments are sources of warmth that can attract rodents and small animals that burrow into the unit and precipitate an arc flash.
  4. Low zero-sequence impedance of generator windings result in arc flash on a ground fault for solidly grounded generators.

Generators also pose an increased safety risk due to the nature of their construction. Typically, generators only allow a narrow space for personnel to work and perform their maintenance. In many cases, arc flash calculations limit burn time to two seconds for workers to get clear of the danger. In a generator application, the personnel are trapped in the enclosure during an arc flash and exposed to the arc for an extended amount of time. It is necessary for arc-flash calculations in confined spaces to increase the arc duration, resulting in even higher levels of incident energy. The arc blast itself can thrust personnel into the walls of the enclosure with enough force to be fatal.

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Protect Your Wind Turbine From Arc-Flash Hazards - Infographic

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