The prototype magamp was rated at 220 V, 60 A and had an internally adjustable tripping sensitivity of 12.5 17.5 mA . Very rapid tripping times were achieved through a novel design, and this combined with the high sensitivity was well within the safe current-time envelope for ventricular fibrillation determined by Charles Dalziel of the University of California, Berkeley, USA, who had estimated electrical shock hazards in humans.
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