When a fuse opens it is replaced with a new fuse, so the protection level is not degraded by previous faults. Electromechanical devices may not have the reserve capacity to open safely when a second or third fault occurs. Overcurrent protective devices that have tripped are often reset without first investigating the cause of the fault. There are many other ways, like circuit breakers or protective relays, and here are 10 reasons why you might just want to consider fusing instead. However, they are not the only devices that you can use to protect your gear from overcurrent. Fuses can also help make your control systems UL and NEC compliant. This keeps the excessive current from continuing down the circuit to more expensive equipment. When too much current flows through the low resistance element of the fuse, the element melts and breaks the circuit. They consist of a low-resistance metal or wire that is used to close a circuit. Fuses are sacrificial devices used to protect much more expensive electrical components from the damaging effects of overcurrent.
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