It has been a long tradition of using re wirable 'Kit-Kat' fuses for domestic protection. Though industries and commercial establishments have shifted to HRC fuse/ Fuse-less technologies, a large chunk of the population still uses re wirable fuses. The following chart explains advantages of HRC fuses over re wirable fuses. Similar advantages can also be attributed to Fuse-less devices like MCB / MCCB.
Re wirable Fuses | HRC Fuses | |
Cause | Low Breaking Capacities of 2kA to 4kA. | High breaking capacity of 80 kA to 120 kA |
Effect | As the load demand is increasing so does the SC level. Hence, rewirable fuses cannot be part of modern protection systems | Use of such high breaking capacity extends use of HRC to domains even beyond MCCBs |
Cause | Oxidation of wire is possible due to direct environmental contact | Enclosed fuse elements. No oxidation possible |
Effect | Tripping characteristics change over time | Tripping characteristics stay constant through the life |
Cause | Trip action is through melting of wire only | Trip action is based on current limiting as well as melting of solder |
Effect | High currents are required for fuse melting . Thus high stress on downstream devices and cables | With solder having lower melting point, even smallest overloads can be detected. Significant reduction in downstream stress |
Cause | Arc quenching in air | Arc quenching in sand |
Effect | Unsafe operation as probability of arc spread is high | Safer operation as arc spread probability is lesser |
Cause | Precise current rating cannot be determined on fuse wire | Precise current rating can be used with HRC fuse |
Effect | Very high chances of wrong operation | Optimized operation with complete protection |
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