PGR-8800 Arc-Flash Relay block diagram

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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