SIA-C Dual & SELF-POWERED Relay OC&EF Protection Relays with standard transformers

SIA-C Dual & SELF-POWERED Relay OC&EF Protection Relays with standard transformers

The SIA-C is an Overcurrent Protection Relay with SELF-POWERED and Dual Powered (self+auxiliary) models.

Being Fanox one of the first manufacturers in designing one self-powered relay with these characteristics, now has already designed the SIA-C, with a more compact size, for covering all the customers’ requirements and making the installation much easier.

The relay SIA-C gets its supply from the current lines through standard transformers /1 or /5 placed therein, eliminating the necessity of batteries and any other kind of maintenance, decreasing this way considerably the center’s operative cost. Optionally it is possible to add auxiliary supply apart from the characteristic self-powered supply


  • Protection functions:50, 50N/G, 50/51, 50/51 N/G, 86, PLC. Optionally 49T and 68.
  • Self power supply 0.1 In (3phase) and 0,2 In (single phase).
  • Auxiliary supply 24 Vdc/110 Vac/230 Vac/48Vdc/85-265Vdc-ac.
  • Test menu.
  • Optionally with internal commissioning battery.
  • Communication protocol Modbus RTU.
  • Uses the operating current through three /1(2.5VA) or /5(5VA) standard current transformers fitted on the lines.
  • Without battery operating costs of the centre are reduced. 500 events are recorded and specific test menu is provided. In withdrawable model up to 1024 events are recorded.
  • The line opening mechanism is activated by a striker or a coil using TCM trip adapter.
  • Trip cause indication even if the relay loses the supply.
  • Front port RS232, Rear port RS485. (optional)
  • Two different sizes: 4Ux1/3 rack and 4Ux3/5 rack.
  • Up to 3 signalling outputs. In withdrawable model these outputs are configurable thanks to programmable logic (PLC).
  • In withdrawable model the contrast of the LCD is adjustable and the demand register is provided.


The FANOX T&D SIA-C Overcurrent & Earth Fault Protection Relay has passed several tests according to IEC 60255-26, IEC 610000-4 series for EMC, insulation tests according to IEC 60255-27 and IEC 60255-5, mechanical tests according to IEC 60255-21 series and climatic tests according to IEC 60068-2 series at the DNV KEMA laboratories in Arnhem, the Netherlands. These tests guarantee the SIA-C usage with total safety and quality in any installation all over the world.

All these improvements are focused in having the installation under the safest control and in saving cost in terms of material and personnel.

Fanox as a specialist in SELF-POWERED relays, is the best ally to adapt your switchgear to what market demands.


ct30_ct50_multitap_sia-c_cts_titulo  SUITABLE CTS FOR SIA-C

Primary …/1A Model Code Protection Self Powered
30 CT-30 – MTP30/1RC80 13510 0,12 VA 2,5 VA
150 CT-150 – MTP150/1RC80 13515 2,9 VA
25 & 100 CT-MULTITAP100-25 41740 2,5 VA

  • Adaptor that lets you connect two batteries AA type of 1,5V to the SIA relays using the front RS232 communications port.
  • The adaptor allows the use of a 12V battery power supply and communication through the port at the same time.
  • Ensures full operability of the SIA, even when tripping in case of a fault.
 percutor_fanox STRIKER PRT-15

  • This is a single effect solenoid. The striker is spring operated.
  • The striker is activated is activated by low-power polarised electrical signal supplied by the relay in case of a fault.
  • The striker is reset to its starting  position  manually.
  • Nominal Voltage (Un): 17 Vdc
  • Travel: 15 mm
  • Spring strength: Start of travel: 37 N , End of travel: 40 N
  • Insulation class: Y
  • Duty cycle at Un (ED): 80%
  • Resistance at 20º: 16 Ohm
  • Protection rating: IP00

  • This item is connected to the relay trip outlet and supplies the energy needed to trip the coil.
  • It is loaded using the auxiliary 230 Vac voltage of the transformation centre and retains power for up to 3 days without external power supply.