Fanox SIA-B Standard CTs – Dual & Self-Powered Overcurrent Protection Relay
Fanox Dual & Self-Powered

Fanox SIA-B Standard CTs – Dual & Self-Powered Overcurrent Protection Relay

SKU FANOX-SIA-B-STD
Fanox SIA-B (Standard CTs) is a Dual & Self-Powered overcurrent and earth fault protection relay for medium voltage secondary distribution substations, RMUs and SF6/compact switchgear. No external battery needed — powered directly from line CTs (start-up at 75 mA 3-phase). Supports Modbus RTU & DNP3.0, with front USB and RS485 rear port.
Technical documents available — View documents
KEMA Certified CE Certified
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Fanox SIA-B Standard CTs — Dual & Self-Powered MV Protection Relay

The Fanox SIA-B Standard CTs protection relay operates in self-powered mode (energy harvested from line CTs) or with auxiliary supply (24–230 V AC/DC), making it ideal for unmanned substations where battery maintenance is costly. It starts up from as little as 75 mA three-phase current, allowing reliable operation under minimal load conditions.

Key Features

  • Self-powered via three /1 A standard CTs (<2 VA)
  • Auxiliary supply: 24–230 V AC/DC; USB power bank or KITCOM adapter for commissioning
  • Optional internal battery (20-year lifetime)
  • 4 configurable LEDs + WATCHDOG self-diagnostics
  • 1,024 event records, 20 fault reports, 10 oscillographic records (COMTRADE) with RTC
  • 168 load-demand circular records (configurable intervals)
  • Trip output: 24 Vdc – 135 mJ; 3 configurable inputs, 3 outputs
  • Front micro-USB + optional RS485 (Modbus RTU / DNP3.0)
  • KEMA certified; compact metallic enclosure

Applications

Secondary distribution substations, RMUs, SF6-insulated and compact switchgear, smart-grid feeder protection.

Managed with SICom PC software (Windows 7–10) for settings, events, fault reports, and COMTRADE oscillography.

Technical Documentation

Datasheets

User Manuals

Protocol Manuals

Installation & Application Guides

Software

Additional Resources