Types MKS and MKA (1954 to 1960)	Back	Up	Next
The MF singlephase meter was superseded in 1954 by the MK singlephase meter. This model was an entirely new design that took advantage of advances in meter design, including a new Alnico V brake magnet (the MF series of meters used an Alnico I magnet) and an increase in overload capacity from 400% to 667%. Interestingly, the 3-wire self-contained version is labeled 30 amperes but the current coils were rated at 50 amperes (the Kh of these meters is 12 instead of 7.2). The baseplate of the socket version was changed from metal to a compression-molded material. The MKS could be sealed with either the traditional screw and lead-wire seal used on the MFS or with the aluminum breakaway 'T' seal coming into use at the time.	Photo by Austin International