Performance of microkernel vs monolithic kernel. As is always the answer (or at least the preface) to performance-related questions: know your problem domain, run comparative benchmarks, and remember what premature optimization is.
A summary of the difference between contactors, motor starters, relays and circuit breakers. Switches, circuit breakers, and contactors are used to control what parts of an electrical system are energized or de-energized. Fuses are used to protect the electrical system when something goes wrong, and can isolate the faulted parts from the normal parts.
The purpose of fuse is to allow a minimum current necessary for the function of the equipment and the current carrying capacity of the connecting wires. When the current exceeds this minimum value, the metal wire in the fuse, melts and the circuit is open (switched off automatically).