The magne X interrupter is used in series with low current primary protection devices such as a Bay-o-net Fuse or Magne X The magne X interrupter .

The magne X interrupter highly efficient current-limiting section minimizes the effects of high fault current stresses on equipment and the distribution system.Its minimum interrupting rating is coordinated with that of a low current interrupter to avoid undesirable low current operation ; yet its maximum interrupting rating will clear the highest fault currents likely to occur . Higher continuous current ratings can be achieved by connecting two fuses in parallel.