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Re: Fan voltage
First, the fan voltage is unrelated to the breaker current rating. Whatever breaker you use, you'd better be supplying the 12 volts needed by the fan. A properly-working fan won't pull more current than it needs, so the size of the breaker isn't really relevant unless the fan itself breaks.
Remember, a circuit breaker's job is to protect the wiring. Regardless of how much current the component is expected to draw, the maximum rating of the breaker should be based on the size of the wires. (The FRC manual gives the rule in the other direction: the gauge of the wires must reflect the size of the breaker.)
If you use a 30 amp circuit breaker, you should be using 14AWG or larger wire.
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