for circuit-breakers in the range from 12 to 40.5 kV with short-circuit breaking currents up to 63 kA, and interrupters for switch-disconnectors and contactors from 7.2 to 12 kV.
Embedding the vacuum interrupters in epoxy resin makes the pole parts of the circuit-breakers extremely robust and protects the interrupters from both impacts and external impairments