I am currently designing a 24VDC circuit for a small vehicle. I personally prefer using MCB's since they are simple to reset and easy to detect faults in the system, although i do find it rather hard to calculate the correct size and type of MCB for the circuit due to its changing characteristics compared to normal AC circuits.
So it opens up a few questions on this matter:
- If i use MCB, how do i handle a short-circuit if the battery is unable to supply enough current to break (eg. under-voltage guard?)?
- Should i forget all about AC/DC MCB's and use normal fuses instead?
- What is the best practice when calculating MCB for DC circuits, in means of size and type?
Since i have a very restricted budget, pure DC MCB's or electronic fuses are pretty much out of the picture (unfortunately).