CB series switchboard (1946 to 1963) Previous
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The CB series had two major changes over previous switchboard meters. First, since the CS/CA meter element was used, the meter was much more compact than earlier models. Second, a semi-flush mount version with bult-in test switch was introduced as an option ("Flexitest" case) and these types have an F at the end of the model number. Later CB series meters have an Alnico magnet assembly instead of the copper-plated steel magnets.
 
CB-2, glass case
Don Price collection