Products Relays

October 2013 - Transition to 4000 Series Protection Relays
ERLPhase is pleased to announce to our relay customers that our 4000 series of protection products is now complete, including the addition of the F-PRO 4000 and the advanced B-PRO 4000 Multibus Protection Relay. Customers used to purchasing our older generation protection relays will experience a seamless transition and increased functionality with the purchase of 4000 series relays.

B-PRO 8701 Bus Protection Relay (1 Phase)

B-PRO 8701 Bus Protection Relay (1 Phase)

The B-PRO 8701 provides bus & substation differential protection (low impedance), with CT saturation security, integrated breaker failure & overcurrent protection, with DFR quality fault oscillography, sequence of events logging and metering in a fully integrated protective relay solution.

The B-PRO 8701 is a comprehensive bus bar protection for LV, HV and EHV busbars featuring integrated protection and breaker failure for a bus with up to 18 connections. Use three single phase B-PRO 8701 relays to build a complete three phase bus bar protection system.


  • Up to 18 sets of CT inputs for differential protection (54 currents) using percentage slope characteristics for security on external faults. One B-PRO relay (model 8701/BUS) for each phase
  • CT saturation blocking for external faults
  • Backup overcurrent and breaker failure for each input current.
  • User defined directional control of overcurrent functions for networked lines.
  • Use 3 Phase voltages to apply over/under voltage and over/under frequency protection functions.
  • Use 3 phase-to-neutral voltages to provide metering, plus Loss of Potential protection
  • Protection functions include IEEE devices 87B, 27, 59, 60, 81, 50LS, 50BF, 50/51/67
  • ProLogic - control logic statements
Recording, Monitoring and Metering
  • High quality recording - fault recording (96 samples/cycle) and event logging (1 ms resolution)
  • Metering functions for each input connection
Substation Automation - Ethernet Ready
  • Direct-connect DNP3 and Modbus SCADA communication protocols
  • 3 communication RS-232 ports
  • IRIG-B time stamping and sample synchronization
  • Standard 100 BASE-TX Ethernet Port
Easy to Use
  • Easy to use, simplified relay setting and record analysis software (Windows® 2000/XP) included
  • Intuitive ASCII-terminal interface provides full local or remote access
  • Coordinated operation via the standard Ethernet port included in each box

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Winnipeg, Canada