Type MH series (1950 to 1963) Previous
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The MH series of meters was a simplification of the MG meter design by reverting to a multiple-disk design last used with the MF polyphase. However, the stators were made much more compact so the two-stator models could be produced in socket-type versions (and these models were the same size as the MFS singlephase model). A three-stator socket model was made using an oval cover and an adapter-type base that allowed it to plug into a standard socket. Also introduced at this time was the 'B' base (the forerunner of the 400-amp K-base meters) which brought the current coils directly outside the meter base to form terminals that slid into special clamps in a special enclosure for these meters, permitting a full 200 ampere capacity with a bottom-connected installation (but with the enclosure required, a socket meter would have sufficed). Incidentally, Sangamo did gear up to produce a line of 'B' base meters but only 4 units were built before production was abruptly halted!

The self-contained MH meters were replaced by the ML series of meters in 1958, and the transformer-rated models continued until 1963.

 
3-stator MH
Electrical Metermen's Handbook
MH B-base meter
Electrical Metermen's Handbook