The ammeter switch was specially developed to be used in switching CTs in polyphase systems, where there is only one instrument for measuring the current of the 3 phases. The ammeter switch has 4 positions, 3 positions to select each phase for current measurement and 1 OFF position.
THS Rotary Keys are manufactured in 4 size families. The maximum dimensions and drilling dimensions for fixing the keys to the equipment are given in the following tables. The dimensions basically depend on the key size family (D0, D1, D2 or D2x2), the type of key fixation (at the top, “E” or at the base, “V”) and the number of chambers that make up the key .
