AC auxiliary boards are designed for input and distribution of electrical energy from working and (or) backup transformers, or backup network 0,4 kV, protection of transformers and lines from overload currents and (or) short-circuit currents, as well as for infrequent operational switching on and off of electrical circuits with voltage up to 400 V AC frequency 50 Hz.
AC auxiliary panels are formed of AC auxiliary cabinets, hereinafter referred to as "cabinets SHSN-0,4", of the following types:
- working transformer input cabinets;
- backup transformer input cabinets;
- sectional switch cabinets;
- cabinets of outgoing lines.
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