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2 votes

Why don't cars have circuit breakers instead of fuses?

Fuses and circuit breakers are two kinds of overcurrent protection; both protect from two kinds of events: Short circuit, in which a positive conductor touches the common/ground. This causes instant, ...
2 votes

Why don't cars have circuit breakers instead of fuses?

I'll add one factor which the other already good answers didn't mention in detail: weight. Modern cars have several dozens of fuses, each one weighing a couple of grams. Imagine replacing them with ...
4 votes

Why don't cars have circuit breakers instead of fuses?

With one notable exception, automotive fuses almost never blow in the absence of a catastrophic failure such as a crash which causes wiring to be severed. One of the primary purposes of the fuses is ...
  • 291
8 votes

Why don't cars have circuit breakers instead of fuses?

In addition to the other good answers: You'll see self-resetting circuit breakers in heavy-truck applications, which is a far more abusive environment, and prone to intermittent faults (esp. in ...
  • 311
44 votes
Accepted

Why don't cars have circuit breakers instead of fuses?

(1) Fuses are cheap. Really cheap. You can get a variety pack of 100 for $8 or so. Circuit breakers for 12V systems are available, but are not cheap (more like $10 each). My car has 40 or 50 circuits, ...
14 votes

Why don't cars have circuit breakers instead of fuses?

I don't have a definitive answer, but believe it is a combination of factors and boils down to the following: Cost: While both do the job of protecting circuits, a fuse runs you cents per unit, while ...

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