Abstract
Break arcs are generated between silver electrical contacts in a DC 42V resistive circuit. Circuit current when the contacts are closed is varied from 5A to 21A. Break arcs are driven by the radial magnetic field that is formed between the electrical contacts with a permanent magnet embedded in the cathode. The arc motion is taken with a high-speed camera and contact surfaces are observed after break operations. Experimental results with the magnet are compared with those without the magnet to confirm the effect of the embedded magnet. For break operations with the magnet following results are shown for each circuit current. Break arcs are rotationally driven by the radial magnetic field in the direction according to Lorentz force. The shortening effect of the arc duration is confirmed. The traces of the arc spots on the contact surfaces are ring-shaped, wide and uniform. This result shows the prevention effect of local erosion of electrical contacts. The rotational frequency is increased by the increase of Lorentz force to drive the break arc rotationally with the increase of the arc current.
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