SWITCHING-OFF BEHAVIOUR OF CONTACT MATERIALS AgCdO 15, AgNi 30 AND Cu+ UNDER CONDITIONS OF CATEGORY AC-4

Bohuslav Dubravec

   The paper deals with the switching-off behaviour of contact materials AgCdO 15, AgNi 30 and Cu+. The switching-off behaviour was investigated experimentally under conditions of category AC-4, at supply voltage 230 V, in a current zone 400 to1200 A. The switching-off behaviours are characterized with two types of dependencies. The dependencies of the maximum arcing time versus interrupted current at which the interruptions were realized at first current zero. The dependencies of the maximum arc energy versus interrupted current at which the interruptions were realized at first current zero, too. All dependencies have been found for the velocities of a moving contact v=0.8 ms^-1, 0.6 ms^-1 and 0.38 ms^-1.

Keywords: interruption, switching-off behaviour, contact material

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