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The withdrawable vacuum circuit breakers VBWB, with rated currents up to 2,500 A, 17.5 kV and 31.5 kA, feature a robust and compact structure, and are used for the protection of electrical circuits.
The interruption of the electric current is carried out inside a ceramic structure known as an encapsulated vacuum interrupter. We use the encapsulated interrupter model, which ensures high reliability in electric arc extinction, allowing for a high vacuum level inside and housing the fixed and moving contacts.
The electric arc is initiated the moment the contacts separate and, thanks to the structure in which these contacts are housed, it is easily extinguished. The excellent insulation inside the interrupter prevents the loss of vacuum and therefore minimizes contact wear in case of a short-circuit; it also efficiently reduces the energy generated by the arc.