IS-8 through IS-12 (1928 to 1980) Previous
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Following the introduction of the I-16 singlephase and the DS-19 polyphase switchboard meters, a line of singlephase switchboard meters was produced, and the table correlates the singlephase switchboard models to their polyphase versions. In 1955, the chrome steel magnets were replaced with the smaller and more reliable Alnico V magnet assemblies.
ModelPolyphase equivalent
IS-8 (surface)DS-19, DS-20
IS-9 (flush-mount)DS-34, DS-35
IS-10 (flush-mount, draw-out)DS-38, DS-39
IS-11 (surface, draw-out)DS-40, DS-41
IS-12 (semi-flush or surface, draw-out)DS-43, DS-44
 
IS-8
GE catalog
IS-12
Schenectady Museum Archives