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Old 12-12-2017, 07:25 PM   #1
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best 12v breaker replacement

the original thermal stud mount breakers in my 97 excella are failing one by one.
Which would be the best to replace them with?:
Type 1 auto reset
Type 2 Modified reset
>>The breaker will operate until tripped, when an internal resistor will keep the breaker in the off position until power is completely removed from the circuit. This process recycles until the source of the overcurrent is removed or corrected.<<
Type 3 Manual reset
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Old 12-13-2017, 04:55 AM   #2
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I decided to go with the 20amp parallel Bracket type 3 manual reset. The auto reset is convenient, but the manual reset gives the user more control over the situation.
https://www.delcity.net/store/Manual...98672.h_201365
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Old 12-13-2017, 05:39 AM   #3
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I prefer the manual reset types. With the auto-reset breakers, if there is a short, they can, and probably will, continue resetting themselves until they fail. And while they shouldn't fail in the closed position, I have been around long enough to know nothing ever works 100% as designed.
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Old 12-13-2017, 08:52 AM   #4
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Manual reset us the safest as it puts a person in control.

I would never use a cycling breaker that repeatedly closes into a short circuit fault condition, which can continue until the breaker fails, especially there is no one present to notice anything unusual going on.

Modified reset can be an issue when battery voltage sags and the heating resistor cannot cause enough heat to keep the breaker open, effectively causing the breaker to become a cycling breaker closing repeatedly into a short.

And I have seen cases of 12v automotive type circuit breakers failing shorted with undesirable consequences. There is no 12V automotive breaker made that is guaranteed to fail open and they only have a limited cycle life. Keeping cycle count down is good and best done with a manual reset.
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Old 12-13-2017, 10:44 AM   #5
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Type 2 or 3 only. I have had both TT and TV fires from just the TT circuit breaker resetting when there as a low grade short. Think overloaded for a long period of time, then a cascading failure and a harness fire.
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Old 12-13-2017, 05:37 PM   #6
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Type 2 for trailer brake circuit - directly from batteries.
Type 3 for all others.

73/gus
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