SIA-B self-powered overcurrent and earth fault relay for switchgear/RMUs
The compact SIA-B overcurrent and earth fault protection relay for secondary distribution cubicles and RMUs. It operates without auxiliary supply on the energy of the line CTs, with a self-powering threshold of 0.075·In for standard CTs.
- Power supply
- self-powered from CTs (standard /1 or special CTs) + opt. 24–230 V AC/DC, USB, power bank
- Self-powering threshold
- 0.075·In (3 phases) for standard CTs; 0.4·In for special CTs
- Functions
- 50/51, 50N/51N (50G/51G), opt. 46, 49, 50BF, 79, CLP
- Trip output
- to a 24 V DC trip coil – 135 mJ
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The supply is taken from standard CTs /1 or special CTs with a threshold of 0.4·In, optionally from 24–230 V AC/DC, USB or a power bank. The relay performs functions 50/51, 50N/51N (50G/51G), with optional 46, 49, 50BF, 79 and CLP. The trip output drives a 24 V DC trip coil with an energy of 135 mJ, communication is via USB, with optional RS485 (Modbus RTU / DNP3.0). The memory holds 1024 events, 20 fault reports and 10 COMTRADE waveforms. The relay is used at distribution substations, wind and solar plants.
Technical specifications
| Power supply | self-powered from CTs (standard /1 or special CTs) + opt. 24–230 V AC/DC, USB, power bank |
|---|---|
| Self-powering threshold | 0.075·In (3 phases) for standard CTs; 0.4·In for special CTs |
| Functions | 50/51, 50N/51N (50G/51G), opt. 46, 49, 50BF, 79, CLP |
| Trip output | to a 24 V DC trip coil – 135 mJ |
| Communication | USB, opt. RS485 (Modbus RTU / DNP3.0) |
| Recording | 1024 events, 20 fault reports, 10 COMTRADE waveforms |
Request a price and lead time
SIA-B self-powered overcurrent and earth fault relay for switchgear/RMUs. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8536 49 00 90 |
|---|---|
| HS, 6 digits | 8536 49 |
| CN (EU) | 8536 49 00 |
| HTSUS (USA) | 8536 49 00 80 |
| China customs tariff | 8536 49 00 90 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
Does the SIA-B relay need an auxiliary supply?
No, the relay is powered by the energy of the line CTs with a threshold of 0.075·In for standard CTs, and the 24–230 V AC/DC auxiliary supply is optional.
How does the relay trip the circuit breaker?
The trip output drives a 24 V DC trip coil with an energy of 135 mJ.
Where is SIA-B used?
In secondary distribution cubicles and RMUs at distribution substations, wind and solar plants.
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