The protection of individual I/O points is as important as the protection of any other control device. The use of fuses is one of the most fundamental decisions that needs to be taken by a protection engineer to ensure maximum safety as well as uptime for industrial assets.
Circuit breakers and fuses are two of the most widely-accepted types of protection. While circuit breakers have the benefit of reusability, the quicker operation of fuses make them an appropriate choice for I/O protection. In addition, fuses are better at blocking let-through energy, providing better protection for downstream devices. Therefore, wherever quickness is a priority, fuses should be preferred over other modes of protection.