Earth fault and overload protection relay FANOX SIA-B Specific CT

The SIA-B is an OC&EF Protection Relay with Self-powered and dual-powered (self-powering + auxiliary power) options.

Specific current transformers. The relay is self-powered using the operating current through three specific current transformers fitted on the lines. These transformers are also used to obtain current measurements.

Auxiliary power supply Besides. The SIA-B can be used with an auxiliary power supply (24- 230Vac/dc). The relay can also be 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), as optional.

Metallic box with a high electromagnetic compatibility level (EMC) and wide range of operating temperatures.

Really low start-up levels. In self-powered mode, SIA-B starts up from 0.4 times the CT's minimum primary current (three-phase current).

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

The bistable magnetic indicator (flag), which indicates the trip condition, maintains its position even though the relay loses the supply.

Self-diagnosis of the relay status (WATCHDOG) through a LED.

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 protocol) on the rear side.

Trip output for a low-power coil. The SIA-B is provided with a trip output for a low-power coil (24 Vdc—135 mJ) and, depending on the model, 1 external trip input and 2 configurable outputs.

Non-volatile RAM memory. The SIA-B is provided with non-volatile RAM memory to store up to 100 events and disturbance fault recording (DFR—4 fault reports in data format). Thanks to its internal RTC (Real Time Clock), the device maintains date and time even without a power supply.

There are no external batteries. The installation and subsequent maintenance of external batteries are eliminated, reducing the centre's operating costs.

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