I-VBs indoor high-voltage vacuum circuit breaker iyisisetshenziswa sasendlini esinezigaba ezintathu se-AC6oHzand sikagesi esilinganiselwe esingu-12 KV esisetshenziselwa ukulawula nokuvikela izinto zikagesi kumabhizinisi ezimboni nezimayini, izitshalo zamandla, iziteshi ze-transformer. Okwamanje, ingasetshenziselwa izindawo lapho idinga ukusebenza njalo.