|
Fuses are inexpensive protection devices, right? The simple response is yes, they are absolutely inexpensive protection devices. However the total cost of ownership could be more than you are willing to pay.
In many plant floor situations where fuses are used, a separate disconnect must be installed because fuses are designed to open during overcurrent conditions only. In many cases, when using a fuse, you must order a fuse holder and a disconnect device. Although your initial cost of a fuse, fuse holder and disconnect device is low you must maintain each part number and inventory the parts on your production floor.
Consider how many trips you anticipate over the life of a fuse. In many instances and locations you would need to enlist the expertise of a qualified electrician to replace the fuse that can add significant cost during the use cycle.
Fuses meet a 100kA SCCR rating that can handle all fault currents up to 100kA covering most locations. However, the vast majority of those faults are significantly lower than 100kA. Typically they are between eight and ten times the handle rating. A 100kA sized fuse dramatically lowers the protection of low level faults, the most common fault range.
The reality of using circuit breakers…
Circuit breakers are simple, robust, time and money saving devices that can save over the life of installations.
Fuses need multiple components for a complete solution – In contrast, a circuit breaker by nature is a disconnect device, eliminating the need for a holder and an additional disconnect device. This all in one package eliminates the need to purchase, maintain and inventory multiple part numbers.
Fuses blow and in many cases require enlisting a qualified electrician for replacement. In contrast, when a circuit breaker trips you simply flip the circuit breaker to the “on” position and continue production. Use of circuit breakers can also help avoid additional cost due to nuisance fuse blowing for misapplication of fuses after initial installations.
Summing it up…
Circuit breakers eliminate costs associated with blown fuses and those associated with maintaining and stocking spare fuses. They offer a visual trip indicator and allow you to quickly resume production to help protect customer’s investment by reducing downtime. The initial cost of purchasing a fuse can be significantly lower than purchasing a circuit breaker, however, when you consider the total cost of ownership the choice is clear.
Learn more about the reality of using circuit breakers.
|