Solutions   for   Protecting   andManaging   the   Electrical   Network

NP.IH 800 R

Earth Overcurrent Relay

NPIH800 R provides the earth fault overcurrent protection for medium and high voltage electrical networks. This multi-function relay also supervises phase to earth short-circuits and the good operating of the circuit breaker and its trip circuits.
As well as the usual protection functions, NP800 relays provide monitoring, measurement and recording of the electrical quantities of the network.
The relays can be set locally, using either the keypad and display or the RS232 port, or remotely using the RS485 port. Setting, reading, measurement and recording are all available locally or remotely.

NPIH800R (R2 case) is dedicated to the refurbishment of 700 and 7000 series (R2 case) of CEE earth fault overcurrent relay. Two mountings are available, Flush Rear Connection (EDPAR) or Projecting Rear Connection (SDPAR). A blank cover R1, provide in option, can improve mechanical installation (replacement of CEE case R3 by a NPIH800R).


  • Earth fault with 2 thresholds [51N] [50N]
  • Latching of the output contacts [86]
  • Trip circuit supervision of the breaker [74TC]
  • BF Breaker failure [50N-BF]


  • Modular withdrawable case R series
  • Configuration and parameter setting by local MMI or off-line / on-line PC
  • Measurement of electrical quantities:
    – Instantaneous, integrated and maximum values of earth currents
  • Logical selectivity on the two earth thresholds
  • 2 setting groups, locally or remotely selectable by digital input or by the communication channel
  • Self-diagnosis: Memories, output relays, A/D converters, auxiliary supply, cycles of execution of software, hardware failure
  • 3+1 assignable output units / 4 assignable digital inputs
  • Event recording: 250 locally recorded events, 200 saved in case of loss of auxiliary supply
  • Disturbance recording according to Comtrade® format: storage of 4 recordings of 52 periods
  • Communication by Modbus/RTU® RS 485


  Device Doc. Type Lang. Ref. Index
NPIH800R Leaflet EN A561 C
NPIH800R First Handling Guide EN A337 D
NPIH800R User Manual EN A336 F
NPIH800R Connection/Definition Diagram EN / FR S39964 F