Dual|Self-Powered Overcurrent Protection


The SIA B is Overcurrent Protection Relay with Self-powered and dual powered (Self-powering + Auxiliary power) options.

Impeccably suited for protection and distribution systems, with minimal space requirement, SIA-B compact relay provides a comprehensive range of functions in an amazingly compact and space-saving housing.

The real advantage is that the installation and subsequent maintenance of external batteries are eliminated. The innovative relay is Self-powered using the operating current through three /1 (<2VA) standard current transformers fitted on the lines. These transformers are also used to obtain current measurements. Besides, SIA-B Relay can be used with an auxiliary power supply (24-230 Vac/dc). The operating costs of the centre are reduced.

SIA-B Standard CT’s Protection Relay offering a high performance previously available only in relays with Vaux:

  • Remote communications for SCADA (Modbus or DNP3.0 protocols).
  • Up to 10 COMTRADE records.
  • Advanced functions.
  • Completely configurable I/O thanks to advanced logic.

Ultra-fast SOTF
Very low start-up levels and minimum consumption <2 VA
Compact design

Data Sheet

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    The SIA-B is a compact OC&EF Protection Relay with Self-powered and Dual-powered (Self-powering + Auxiliary Power) options.

    Standard Current Transformers. It provides reliable Self-powered using the operating current through three /1 (<2VA) Standard Current Transformers fitted on the lines. With the advantage that these Transformers are also used to obtain current measurements.

    Universal Vaux. SIA-B can be used with an auxiliary power supply (24-230Vac/dc). The relay can be also supplied by a USB cable connected to the laptop, with the USB KITCOM adapter or a standard power bank.

    Internal commissioning battery. Included Lithium battery: 20 years lifetime.

    Metallic box. Increase safety by using a metallic box with a High Electromagnetic Compatibility Level (EMC) and a wide range of operating temperatures.

    Really low start-up levels. In Self-powered mode: 75mA in three-phase system /160 mA in single-phase system.

    Test menu. Allows the trip circuit to be tested before the transformation centre is powered up.

    Multiple options for powering and communication

    There are 4 configurable LEDs. When the relay is switched off, its previous states can be checked by powering the relay up (by self-powering the relay through a USB cable, auxiliary voltage, or pressing the commissioning battery).

    Self-diagnosis of the relay status. (WATCHDOG) through the configurable LEDs and outputs.

    Low Power Consumption.

    Communications Ports. To allow communication, relays are provided with a local micro-USB front port and with an optional remote communication RS485 port (Modbus RTU or DNP3.0 protocol, selectable by general settings) on the rear side.

    Configurable Inputs and Outputs. The SIA-B is provided with a trip output for a low power coil (24 Vdc – 135 mJ), 3 configurable inputs, and 3 configurable outputs.

    Load Data Profiling. The SIA-B is fitted with the demand of current (Load Data Profiling) with the following characteristics:

    • Number of records: 168
    • Recording mode circular
    • Sampling rate (interval): configurable through communications 1-60 min

    Non-volatile RAM memory. The SIA-B is provided with non-volatile RAM memory in order to store up to 1.024 events and disturbance fault recording (DFR20 fault reports and 10 oscillographic records in COMTRADE format), for rapid commissioning, testing, and post-fault diagnostics. Maintaining date & time thanks to its internal RTC (Real Time Clock) even without power supply.

    Intuitive and Efficient SICom Communications Program. The oscillography is downloaded by the communications port. The SICom communications program allows the oscillography record to be downloaded and saved in COMTRADE format (IEEE C37.111-1991). The user-friendly interface reduces engineering and commissioning time.

    No external batteries. The installation and subsequent maintenance of external batteries are eliminated. The operating costs of the centre are reduced.

    Compact size. Its compact size makes SIA-B easy to install and its lightweight helps the customer to save costs on transport.

    50 Instantaneous phase overcurrent

    51 Inverse time overcurrent

    49T External trip

    51G Inverse time measured neutral overcurrent

    50G Instantaneous measured neutral overcurrent

    46 Phase balance current protection

    49 Thermal overload

    SHB Second Harmonic Blocking

    CLP Cold Load Pickup

    52 Breaker wear monitoring

    50BF Circuit Breaker Failure

    68 Zone selection interlocking

    PGC Programmable logic control

    TB Trip Block for switch disconnector

    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 block/unblock the recloser
    • Configuration of the inputs
    • Configuration of the outputs
    • Configuration of the causes that start a Fault Report

    The update of the software does not require any user´s action, this is, if the computer is connected to 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.

    Striker – PRT

    Self powered Relays do power themselves from the primary current and the energy is scarce, so an efficient management of this energy is indispensable.

    Due to this situation using coils is not viable because they have a very high electrical consumption. The solution is to use a striker.

    Auxiliary Battery Power Supply – KITCOM

    The KitCom is an adapter to supply SIA relays through the front communication port, allowing the communication with the computer simultaneously.

    Trip Coil Module for SELF POWERED Relays

    TCM is an energy accumulator that can be charged, through its auxiliary supply terminals, before the installation or once the device is installed, if in the installation auxiliary supply is available. The charging time is 10 seconds approximately and once the power supply is lost the TCM has three days of autonomy.

    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

    Product quality is something we take very seriously and reliable testing is a key point.

    We have expanded our testing capabilities to cope with new developments of protection relays and higher demand for our devices.

    The additional functions required by our customers imply longer and more complex testing procedures.

    Save Money using ONE Self-powered Relay for TWO Applications

    A relay with different settings for regular operation and maintenance tasks is a requirement that is gaining more and more important not only to speed up the process, but also to comply with newer and severer safety procedures.

    So far, two relays, one for each application, are installed. Still, this solution is not practical considering the compact sizes of the RMUs and the importance of finding economical solutions for this purpose.

    Fanox SIAB relay is provided with four separate settings groups that will allow the user to set different settings depending on the application. The relay is provided with configurable inputs that are activated without external supply. By activating the corresponding inputs the relay will change automatically to the desired group. Besides, if configurable LEDs are used to indicate the settings group that the relay is working with.

    SIA-B relay becomes the best and more reliable solution to save money, to facilitate the settings process, and to offer the best protection even when auxiliary supply is not available.

    Related Products

    SIA-B Specific CT’s

    Dual & Self-Powered OC&EF Protection Relays

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

    SIA-C Standard CT’s
    Dual & Self-powered OC&EF Protection Relays

    Counting with extensive experience of successfully operating devices in the field worldwide and thanks to these unique advantages, SIA-C enjoys top recognition among users all around the planet.

    Above all, the different mechanics available by model list make our SIA-C the best choice for our customers, covering all the needs of the market

    Remote communications RS485 Modbus RTU or IEC 60870-5-103

    • Self-Powered & Dual-Powered (Self+Vaux)
    • Standard CTs /1 or /5
    • Low start-up levels
    • Load data profiling
    • Self diagnosis (watchdog)
    • Non-volatile RAM memory (up to 1.024 events and 20 fault report), maintaining date & time even in SP mode, thanks to its internal RTC
    • With internal commissioning battery as optional
    • Withdrawable model as optional

    Ansi Code Functions
    50, 51, 49T, 51G, 50G, 46, 46BC, 49, SHB, CLP, 79, 52, 50BF, 74TCS, 60CTS, 68, PGC


    FTB/FTP Advantages

    FANOX FTB/FTP test block allows testing the protection, control, metering and/or communication device of a facility connected to field switchgear, easily and safely, isolating the circuits fully and eliminating all risks for the user.

    • Maximum safety for the user.
    • Internal automatic CT short circuiting.
    • Single hand fully isolated plug.
    • Locking system for safest operation.
    • Possibility of horizontal or vertical mounting, respectively.