SLOT788 In AC systems, where the current passes through zero twice for each cycle, all but the most energetic arcs are extinguished at the zero crossing. The problem is more severe with DC where such zero crossings do not occur. This is why contacts rated for one voltage for switching AC frequently have a lower voltage rating for DC. Ragnar Holm contributed greatly to electrical contact theory and application.|{3|4|5|6|7|8|9|10|Three|Four|Five|Six|Seven|Eight|Nine|Ten} {Ways|Methods} To Have (A) {More|Extra} {Appealing|Interesting} Slot Table Osrs