J2S and J2A (1954 to 1960) Previous
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In 1954, Sangamo came out with the J2S and J2A singlephase meters which brought the maximum capacity from 60 amperes in the JS and JA to 100 or 200 amperes in the J2S and 100 amperes in the J2A. Shortly after its introduction, several major changes were made to the J2 meter. The internal frame was changed from cast iron to aluminum and the base on the Class 100 self-contained meters was changed from metal to fiberglass resin. The Class 200 extended-range and the Class 10 transformer-rated versions continued to be produced with a metal-base. J2S
Photo by Austin International