PGR-8800 Series – Arc-Flash Relay Series - Littelfuse PGR-8800 Arc-Flash Relays Offer Superior Arc-Flash Detection

NEC 250-67 Arc-Energy Reduction Technical Paper
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The PGR-8800 series arc-flash relay is a microprocessor-based protection relay that limits arc-flash damage by using light sensors to rapidly detect an arc and then trip a circuit breaker. 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 an adjustable trip-level reduce the chance of nuisance tripping by setting a threshold for ambient light. The PGR-8800 accepts PGA-LS10 point sensors and PGA-LS20/PGA-LS30 fiber-optic sensors, which are designed to collect light over a wide angle and with high sensitivity. 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. For fast fault location, front-panel and sensor LEDs indicate sensor health and which sensor(s) detected an arc fault. A maximum of four PGR-8800 units can be linked into one system.

Sensor Placement

The PGR-8800 arc-flash relay and sensors are easily installed in retrofit projects and new switchgear with little or no re-configuration. More complex systems with multiple power sources are configured using the relay’s built-in USB interface software. Generally, it is recommended to mount one or two sensors per cubicle to cover all horizontal and vertical bus bars, breaker compartments, drawers, and anywhere that there is a risk for an arc fault. Threading a fiber-optic sensor through the cabinets and in areas where point-sensor coverage is uncertain results in complete coverage and an added level of redundancy. Even if policy is to only work on de-energized systems, all maintenance areas should be monitored to prevent potential damage and additional cost.


  • Arc-flash trip time <1 ms
  • Multiple sensors (up to 24)
  • Fail-safe system
  • Redundant trip circuit
  • Adjustable light sensitivity
  • LED indication (on unit and each sensor)
  • Current detection
  • Optical detection
  • Digital inputs (6)
  • Service mode
  • Trip coil contact
  • Indication contacts
  • USB interface
  • Built-in interface
  • Universal power supply/battery backup
  • Data logging
  • Modbus
  • Upstream tripping

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Relay Contacts ConfigIEEE Device NumbersRelay
DimensionsWeight (lbs/g)Auto Manual ResetDigital InputsFrequencyReset TypeSystem typeTest ButtonStockSamplesCompare
PGR-8800-00120 / 24012 - 48 / 120 / 2403 Form C (N.O./N.C.); 1 Form A (N.O.)50 - AFDFail-safe / Non Fail-safe5.2 H x 7.9 W x 2.2 D in.0.6 KgLatching650; 60; ASDFront-panel switch/Two Remote ContactsSolidly Grounded AC; Resistance Grounded AC; Ungrounded ACFront-panel switch; Two remote contactsOrder
PGR-8800-00-CC0.6 KgCheckOrder

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Catalog # Certificates
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PGR-8800-00 pdf iconculiconULicon
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
PGR-8800-00 Arc Flash Relay RoHS No 02/08/2021 PbFree No 02/08/2021 REACH201_Declaration_with_Pb_PGR-8800-00 Yes
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