Types MKS and MKA (1954 to 1960) Previous
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The MF singlephase meter was superseded in 1954 by the MK singlephase meter.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 had an interesting choice of sealing methods - the cover could be sealed with the aluminum breakaway "T" seal coming into use at that time OR by using a small locking bar, it could also be secured with the more traditional screw and lead-wire seal used on the MFS. Duncan MKS
Photo by Austin International