The PGR-8800 is a microprocessor-based relay that limits
arc-fault damage by detecting the light from an arc flash and
rapidly tripping. Phase-current-transformer inputs are provided
for current-constrained arc-flash protection and, when so
equipped, a programmable definite-time overcurrent function
can be enabled. An optical sensor on the PGR-8800 and
adjustable trip level reduce the chance of nuisance tripping
by setting a threshold for ambient light. Sensors, inputs, and
connections are monitored to ensure fail-safe operation. A
secondary solid-state trip circuit provides a redundant trip path.
A USB port is used for configuration and access to event logs
and graphs.