The SIA-B is Dual & Self powered Overcurrent and Earth Fault Protection Relay

Standart Akım Trafolu
Gelişmiş OC&EF Self Powered Koruma Rölesi


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

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 SIA & SIL protection relays

The SICom PC software has been designed and programmed to gain access to all of Fanox relays information, to 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 system.

  • General data reading: Complete model, Version, Serial number, etc.
  • States reading
  • Measurements reading
  • Reading and changing settings
  • Reading and changing 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.


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
50G 221
51G 111
74CT  1 
46BC  1 
46 11 
79  1 
52 111
50BF 111
CLP 111
74TCS  1 
Trip Block11 1
68 Zone Selection interbloking 111
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
Oscillography 10 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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