The SIL-S is a feeder relay with current, voltage, and frequency protection functions for primary and secondary distribution by means of LPIT inputs. Fanox SIL-S Relay is compatible with Low-Power Instrument Transformers (LPIT)

LPIT combines a Low-Power Voltage Transformer (LPVT) and a Low-Power Current Transformer (LPCT or Rogowsky coil)

SIL-S relay is provided with five (5) RJ45 connectors to measure:
➤3-phase current and voltage (3 channels)
➤neutral current (1 channel)
➤ Additional voltage measurement for line-busbar synchronization

Additionally, it provides control of circuit breakers and reclosers and offers the SOTF function to quickly clear faults in the event of a manual circuit breaker closure.

The relay offers local and remote options for communication, including Modbus, DNP3.0, and IEC protocols. It can also synchronize using IRIG-B, depending on the model.

Each oscillographic record contains analog and digital channels, which can be downloaded using the SICom Communications Software in COMTRADE format (IEEE C37.111-1991).

  • The SIL-S is a feeder relay with current, voltage, and frequency functions for primary and secondary distribution designed to work with LPIT technology (Low Power Instrument Transformers).
  • Auxiliary power supply of 24- 230 Vdc/ac
  • 5 combined current/voltage channels for current sensors (LPCT and Rogowski) and capacitive and resistive low-power voltage sensors (LEA).
  • Metallic box with a high electromagnetic compatibility level (EMC) and wide range of operating temperature.
  • Protection of decoupling, load shedding, and loss of main (islanding). Loss of Main (islanding) occurs when part of the public utility network loses connection with the rest of the system. If this situation is not detected, the generator could remain connected, causing a safety hazard within the network. Automatic reconnection of the generator to the network may occur, causing damage to the generator and the network. SIL-S protection relay detects this situation thanks to its voltage and frequency functions focused on the Rate of change of frequency (ROCOF) method.
  • Signaling/control of the circuit breaker (52 function) and the recloser (79 function).
  • In case a CB is manually closed, a switch on to an existing fault may occur. This fault condition is critical if the overcurrent protection function does not clear the fault until the adjusted time delay is finished. It is necessary, in those cases, to clear the fault quickly by means of the SOTF function.
  • To allow the communication, relays are provided with a local micro-USB front port and with remote communication with different options (ports and protocols) on the rear side:
    » Rear RS485 Port: Modbus RTU, DNP3.0 Serial or IEC60870-5-103(selectable by general settings).
    » Rear RJ45 Port: Modbus TCP/IP, DNP3.0 TCP/IP, IEC60870-5-104 or IEC61850 (selectable by general settings) + SNTP Protocol+ Web Server.
  • Synchronization through IRIG-B is optional, depending on the model.
  • The SIL-S is provided with (depending on the model):
    » 8 configurable inputs and 7 configurable outputs.
    » 11 configurable inputs and 5 configurable outputs.
  • The SIL-S is fitted with the demand of power (Load Data Profiling) with the following characteristics:
    » Number of records: 2160.
    » Recording mode circular.
    » Sampling rate (interval): configurable through communications (1-60 min).
  • Alarms panel is available.
  • The SIL-S is provided with non-volatile RAM memory in order to store up to 3072 events and disturbance fault recording (DFR), maintaining date & time thanks to its internal RTC (real Time Clock).
    » 5 records in data and COMTRADE format (300 cycles each record): 1 to 8 pre-fault cycles + 292 to 299 post-fault cycles.
    » 25 records in data and COMTRADE format (60 cycles each record): 1 to 8 pre-fault cycles + 52 to 59 post-fault cycles.
    » 50 records in data and COMTRADE format (30 cycles each record): 1 to 8 pre-fault cycles + 22 to 29 post-fault cycles.
    » 100 records in data and COMTRADE format (15 cycles each record): 1 to 8 pre-fault cycles + 7 to 14 post-fault cycles.)
  • Each oscillographic record contains 10 analogue channels and up to 96 configurable digital channels. The oscillography is downloaded by a communications port. The SICom communications program allows the oscillography record to be downloaded and saved in COMTRADE format (IEEE C37.111-1991)


50 Instantaneous phase overcurrent
67/51 Inverse Time Directional* Phase Overcurrent
50N Instantaneous calculated neutral overcurrent
50G Instantaneous measured neutral overcurrent
67N/51N Inverse Time Directional* Calculated Neutral Overcurrent
67G/51G Inverse Time Directional* Measured Neutral Overcurrent
67NI Directional isolated calculated neutral overcurrent
67GI Directional isolated measured neutral overcurrent
SOTF Switch On To Fault
46 Phase balance current protection
46BC Broken Conductor Detection
64REF Restricted earth fault
49 Thermal overload
49T External Trip
37 Instantaneous phase undercurrent
SHB Second Harmonic Blocking
59 Instantaneous phase overvoltage (Bus bar)
59N Instantaneous Calculated neutral overvoltage (Bus bar)
59-L Instantaneous phase overvoltage (Line)
59N-L Instantaneous Calculated neutral overvoltage (Line)
47 Phase Balance voltage protection (Bus bar)
47-L Phase Balance voltage protection (Line)
27 Instantaneous Phase Undervoltage (Bus bar)
27-L Instantaneous phase Undervoltage (Line)
27V1 Instantaneous Positive sequence Undervoltage (Bus bar)
27V1-L Instantaneous Positive sequence undervoltage (Line)
32 Directional Overpower
81O/U Under/Overfrequency
81R Rate of change of Frequency (ROCOF)
78 Out of Step (Vector Shift)
CLP Cold Load pickup
79 AC Reclosing device
SCM Sequence Coordination Mode
SZM Sectionalizer Mode
HLT Hot Line Tag
52 Breaker Wear Monitoring
25 Synchro Check
50BF Circuit Breaker Failure
74TCS Trip Circuit Supervision
60CTS Phase CT Supervision
60VTS Phase LPVT Supervision
86 Trip lockout
68 Zone selection interlocking (ZSI)
PGC Programmable logic control


CNT Counters
RTC Real Time Clock
ALRM Alarm panel
PGC Programmable Logic Control
HMI Human Machine Interface
SER Sequential Event Recording
DFR Disturbance Fault Recording
LDP Load Data Profiling
MET Metering
STTG Settings Groups
CMMD Commands

Communication Software for all Fanox Protection Relays MV Range

The SICom PC software has been designed and programmed to gain access to all Fanox relays information, modify the settings and configuration, check states and measurements, and analyze and save events and fault reports using a graphic-friendly user interface.

SICom software works with Windows® Windows 7, Windows 8, Windows 8.1, and Windows 10 operating systems.

  • General data reading: Complete model, Version, Serial number, etc.
  • States reading
  • Measurements reading
  • Reading and changing settings
  • Reading and changing the configuration
  • Reading and deleting events
  • Reading and deleting fault reports
  • Reading and deleting demand current (load data profiling)
  • Reading and saving oscillographic records in Comtrade format
  • Changing the user passwords
  • Saving and Loading Settings files
  • Saving and loading configuration files
  • Saving events and fault reports
  • Saving demand current (load data profiling)
  • Date-time synchronization
  • Configuring the communication parameters
  • Reading and changing counters
  • Commands for opening and closing the circuit breaker and blocking/unblocking the recloser
  • Configuration of the inputs
  • Configuration of the outputs
  • Configuration of the causes that start a Fault Report

The software update does not require any user´s action; if the computer is connected to the Internet, SICom updates itself when it is started.
It will allow you to prepare all the settings and relay configurations without having the relay connected to the PC (offline mode), reducing engineering and commissioning time.
SICom program uses Modbus protocol, so only the ports with this protocol can be used to establish the communication.