PGR-8800 Arc-Flash Relay
Rev. 2
Pub. PGR-8800-M. December 14, 2012 • www.littelfuse.com • ©
2012
Littelfuse • •
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6.3 Current Sensor Characteristics
The current-sensor inputs require 5-A-secondary current transformers. Three phase-current
transformers are required for optimal performance. For best performance, select current
transformers with a primary rating approximately equal to the system’s rated current.
The PGR-8800 measures instantaneous currents and is insensitive to phasing and polarity. The
current-sensor inputs have a burden of less than 0.25 VA at 5 A, will withstand up to 75 A for 1 s,
and are isolated from all other terminals up to 500 Vac.
Ø A
Ø B
Ø C
5A SECONDARY CT’S REQUIRED
OPTIONAL 3-PHASE
OVERCURRENT PROTECTION