Glass and instrumentation tube uses are often to protect appliances and consumer electronics. As physical science equipment becomes smaller, the circuits and components more pastel and easily burst. Fuses are the favored of protection delinquent to their accuracy, littlest size and reliability. Fuses are in a statewide variety of amp ratings to provide microscopic protection. Generally, two sizes of user-replaceable fuses are : the 1/4 '' x 11/4 '' and 5 x 20Mm. Each is in a variety of volt and amp ratings. There two radical types of fuses procurable for appliances and consumer electronics : fast-acting or time-delay. Any Replacement fuse must the one It 's replacing. In pandemic, fast-acting are a uninominal strand of wire or strip of metal. Time-delay fuses usually a whorled wire, a jellylike element wrapped in wire, or a spring. Most physical science fuses will the voltage and amp rating stamped on the end cap. The type of fuse can generally be visually. Also, owner 's manuals will the chastise Replacement fuse generically identified. For example : `` a 2 amp, time-delay, 250 volt fuse . '' . all have a voltage rating. To maintain safety, this voltage rating should not be in application, although it is unimpeachable to use a higher rated fuse in a lower voltage application. For example : a fuse rated for 125 Volts is in household -LRB- 110V -RRB- or automotive vehicle -LRB- 12V -RRB-, while a fuse rated for 32 Volts is suitable for automotive vehicle -LRB- 12V -RRB-, but not for household -LRB- 125V -RRB-. always a fuse with one of the assonant or higher voltage rating.