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QUOTE (RichD @ 20 Jul 2007, 01:54) <{POST_SNAPBACK}>A well designed controller would have a fuse or circuit breaker to protect the transistor in the event of a short. Tracks should have a fuse or circuit breaker for each lane, 30 amps could easily burn up your track wiring unless it is 10 gauge.

Unfortunately fuses or circuit breakers cannot be relied upon to protect transistors.
I've helped lots of people replace transistors that have failed in circuits that do have protection by fuses or circuit breakers.
The problem is that transistors can fail quicker than the fuses or circuit breakers can operate.

Some sort of over current protection such as fuses or circuit breakers are a good idea. They will limit other damage after a transistor has failed and sometimes (but not always) protect the transistor from failure.

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