Development and testing of a 10-kA hybrid mechanical-static DC circuit breaker

Luca Novello, Fabio Baldo, Alberto Ferro, Alberto Maistrello, Elena Gaio

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53 Citations (Scopus)


This paper presents the development and testing of the prototype of a hybrid mechanical-static dc circuit breaker (CB) for quench protection of superconducting magnets based on a mechanical switch paralleled to a static CB. In normal operation, the mechanical switch is closed and it handles the continuous flow of dc current, minimizing the on-state losses. In case of intervention, the mechanical switch opens, commutating the current into the static CB that quickly interrupts and transfers the current into a discharge resistor, withstanding the reapplied voltage. This paper was carried out to face and solve some issues of this design solution being not available in the literature examples of similar applications rated for significant power levels. The operation of the hybrid CB has been successfully tested up to a current of 10 kA with a recovery voltage of about 1 kV. Special tests have been dedicated to characterize the reliability and the repeatability of the current commutation from the mechanical switch to the static CB and to characterize the arc voltage under different conditions. © 2011 IEEE.
Original languageEnglish
Article number6062386
Pages (from-to)3621 - 3627
Number of pages7
JournalIEEE Transactions on Applied Superconductivity
Issue number6
Publication statusPublished - Dec 2011
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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