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Showing content with the highest reputation on 03/04/2020 in all areas

  1. Not necessarily; CBs can operate on different principals to "Open" in an over current condition whereas fuses have a heat sensitive conductor that melts. Fuses that are very high current ratings are called Current limiters. They (kinda) look like fuses only BIGGER. Instead of a small conductor they employee a very thick conductor which requires more current (heat) to melt. Basic electricity states that as current increases more heat is generated in the conductor; so a fuse basically limits how much heat can build up in its conductor (amp rating) to control electrical power to a wire or component. Someone that knows a lot more than I determines what a specific component needs be it a CB or fuse.
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  2. While CBs and fuses essentially "do" the same thing (limit current) the way they do it and the response to overcurrent are different. Generally, Fuses react faster than CBs to overcurrent situations. The component they (CB/Fuse) supply power to determines what type of protection they need. In this case the TQ and TIT Cbs feed 155VAC to power supplies/amplifiers while the fuses provide 26VAC to drive pressure transmitters and gauges without separate internal power supplies.
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