Overcurrent Feeder Protection Relay

SIA-F protection relay is suitable to protect installations against O/C and E/F. Its compact size makes this relay adequate for installations where the space is critical. Optionally, other protection functions such as the thermal image (ANSI 49) the trip block for switch disconnector, and control functions as the monitorization of the CB (ANSI 52), The breaker failure (ANSI 50BF) can be included.

Besides, its special mechanic with the current transformers in charge of the measurement outside, allows the user to change the transformation ratio (by giving turnes through the holes of these current transformers.

The relay is designed to work with standard current transformers (1 A or 5 A of secondary) and is able to measure up to 30 times the nominal current.  It is provided with local and rear communications, with optional protocols as Modbus RTU or DNP3.0 Serial.
Up to 3 outputs and 2 inputs are included in the relay to monitor and signal different situations in the installation.

The SIA-F is able to record up to 200 events, 4 fault reports, and 1 oscillographic record in non-volatile RAM memory with the date and time thanks to its internal real clock (RTC)
Thanks to its versatility and to its compact size, this relay can be used in a lot of applications.

Main Applications: Secondary Distribution, RMUs, and SF6 Insulated Switchgears

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    • The SIA-F is an overcurrent and earth fault for secondary distribution protection relay with universal auxiliary power supply 24-230 Vac/dc. The current measurement is obtained by standard current transformers /1 or /5.
    • The relay can be also supplied by a USB cable connected to the laptop, with the USB KITCOM adapter or a standard power bank.
    • Metallic box with high electromagnetic compatibility level (EMC) and wide range of operating temperature.
    • To allow the communication, relays are provided with a local micro USB front port and with remote communication with different protocols on the rear side depending on model
      • 1 RS485 Port: Modbus RTU
      • 1 RS485 Port: DNP3.0 Serial
    • The SIA-F has up to 2 configurable inputs and up to 3 configurable outputs (depending on model).
    • The SIA-F is provided with non-volatile RAM memory in order to store up to 200 events and disturbance fault recording (DFR4 fault reports and 1 oscillographic record in COMTRADE format), maintaining date & time thanks to its internal RTC (real Time Clock):
    • 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
    51 Inverse time phase overcurrent
    50G Instantaneous measured neutral overcurrent
    51G Inverse time measured neutral overcurrent
    49 Thermal overload
    52 Breaker Wear Monitoring
    50BF Circuit breaker failure
    86 Trip lockout
    68 Trip Bus
    TB Trip Block for switch disconnector
    PGC Programmable logic control


    CNT Counters
    RTC Real Time Clock
    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 of Fanox relays information, modify the settings and configuration, check states and measurements, and to analyse and save events and fault reports using a graphic-friendly user interface.

    SICom software works with the 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.

    SIA-B Specific CT'sSIA-B Standard CT'sSIA-C Standard CT'sSIA-F
    Auxiliary Supply24-230 Vac/dc24-230 Vac/dc24Vdc230Vac48 Vdc110-230 Vac/Vdc24-220 Vcc / 48-230 Vac
    Self Power SupplyI > 0,35 x Is min (x3)0,075 In (x3)0,1 In (x3)
    External batteryUSB cable / Power bankUSB cable / Power bankKITCOMUSB cable / Power bank
    Internal battery√ (*)√ (*)
    Consumption0,5 W1,5 W0,5 W1,5 – 2,2 W
    CTSpecific CTStandard CT/1A - 2VAStandard CT/1A - 2.5VA Standard CT/5A - 5VAStandard CT/1 - 0,5VA Standard CT/5A - 0.5VA
    74TCS 1
    Trip Block111
    68 Zone Selection interbloking111
    PGCProgrammable LogicV3V3V3V3
    Sett. Group243/43
    Inputs--- EXT.TRIP3 DI--- EXT.TRIP 2DI 2DI + EXT.TRIP--- 2DI
    Outputs--- 2NC-NO3 NC-NO--- 2 NC-NO 3 NO1 NO + 2 NC-NO
    Output for STRIKER24 Vdc – 135 mJ24 Vdc – 135 mJ24 Vdc – 135 mJ
    LEDs2 LEDs 2 LEDs +1MAG.FLAG4 LEDs3 LEDs + 1 MAG.FLAGS 3 LEDs + 3 MAG.FLAGS3 LEDs configurable
    HMI20x2 LCD + 7/8 keys20x2 LCD + 8 keys20x2 LCD + 7/8 keys20x2 LCD + 7 keys
    Fault Report420204
    Oscillography10 records x 50 cycles10 records x 50 cycles1 record x 22 cycles
    Current demand
    Local Port (frontal)Micro USBMicro USBRS232 Micro USBMicro USB
    Remote Port (rear)RS485RS485RS485RS485
    Communications ProtocolsModBus RTUModBus RTU ModBus RTU or DNP3.0ModBus RTU ModBus RTU or IEC60870-5-103ModBus RTU DNP3.0
    Size of (HxW)Vertical: 120,65 x 167,80 mmHorizontal: 185,80 x 102,7 mm90 x 245 mmVertical Compact: 177 x 155 mmVertical Standard: 177 x 189 mmHorizontal: 177,8 x 290,3 mm167,80 x 120,65 mm

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    Impeccably suited for protection in distribution as well as in Renewable Energy systems, SIA-B Protection Relay with specific CT’s, provides a comprehensive range of protection functions in an amazingly compact and lightweight housing, preventative maintenance, and remarkable cost savings.

    Remote communications RS485 Modbus RTU

    • Self-Powered & Dual-Powered (Self+Vaux)
    • Low consumption
    • Wide protection range through the Sensors
    • Load data profiling
    • Disturbance fault recording
    • With internal commissioning battery as optional

    Ansi Code Functions

    50, 51, 51N, 49T, 50N, 49, PGC, TB