5. Electronics
Figure 5-5. Input Circuit Breaker and Isolation Power Transformer
• Input Circuit Breaker CB2. This is a 6 amp push-button
input circuit breaker in series with the power transformer
primary winding that protects the input 120 VAC line to the
Isolation Power Transformer.
• Isolation Power Transformer. With the exception of the
heater, this transformer isolates the electronics from the input
line. There are four optional input voltages: 110, 120, 230, and
240 VAC. All options use the same transformer with the
primary coils wired in a different way. Figure 5-6 shows how
two options are physically connected, and Figure 5-7 shows a
schematic diagram with all options.
157-1278-912 Rev A 5-9
November 2003
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