AC fuses are specifically designed for use with alternating current circuits. They are more resistant to electric arcs when the fuse blows than DC fuses and more compatible with standard voltage power supplies. They can usually cope with higher voltages, too. DC Fuses

HRC Fuse Types High rupturing capacity (HRC) fuses feature a transparent capsule around the central resistor. The solution? Disconnecting the circuit from the power line during overcurrent or short circuit situations. The component? There are many possible ways to make this thing happen. Out of which, a fuse is a fastest and inexpensive way to do it. Moreover, Synergistic Research's commitment to customer satisfaction is unmatched. They understand the varied needs of their clients, offering customizable solutions and personal consultations to ensure that their products provide an optimum fit for each unique audio system and listening environment. The breaking capacity (I B) should be sufficient for any operating and error conditions. The short-circuit current (maximum fault current) to be interrupted by the fuse links at the rated voltage under default conditions must not be higher than the current corresponding to the breaking capacity of the fuse link. The rated voltage (U N) of a fuse link has to be at least equal or higher than the operating voltage of the device or assembly unit which is to be protected with the fuse link. If the operating voltage is very low, the fuse link's natural resistance (voltage drop) must possibly be taken into consideration.

The Slow-Blow Fuse vs. the Fast-Blow Fuse

Fuses for low voltage power circuits may have bolted blade or tag terminals which are secured by screws to a fuseholder. Some blade-type terminals are held by spring clips. Blade type fuses often require the use of a special purpose extractor tool to remove them from the fuse holder. High-power fuse means that these fuses can interrupt several kiloamperes. Some manufacturers have tested their fuses for up to 63kA short-circuit current.

In the 1950s, fuses in new residential or industrial construction for branch circuit protection were superseded by low voltage circuit breakers. Switch fuse units distribute current while shielding cables and devices from the damage that would be caused by power fluctuations along a particular electrical circuit. Switch fuse units are used in industrial and commercial buildings as well as domestic properties. The fuses in this catalog range in size from the approx. 0402 chip size (.041”L x .020”W x .012”H) up to the 5 AG, also commonly known as a”MIDGET” fuse (13/32” Dia. x 11/2” Length). As new products were developed throughout the years, fuse sizes evolved to fill the various electrical circuit protection needs. Arthur Wright, P. Gordon Newbery Electric fuses 3rd edition, Institution of Electrical Engineers (IET), 2004, ISBN 0-86341-379-X, pp. 2–10 Breguet recommended the use of reduced-section conductors to protect telegraph stations from lightning strikes; by melting, the smaller wires would protect apparatus and wiring inside the building. [1] A variety of wire or foil fusible elements were in use to protect telegraph cables and lighting installations as early as 1864. [2]

Key Features of Slow-Blow fuses include:

Whether the effects are heating, magnetic stress, and/or arcing, the potential damage to electrical systems can be significant as a result of short-circuits occurring. II. Selection Considerations Temporary overloads occur frequently. Common causes include temporary equipment overloads such as a machine tool taking too deep of a cut, or simply the starting of an inductive load such as a motor. Since temporary overloads are by definition harmless, overcurrent protective devices should not open or clear the circuit. Where several fuses are connected in series at the various levels of a power distribution system, it is desirable to blow (clear) only the fuse (or other overcurrent device) electrically closest to the fault. This process is called "coordination" or "discrimination" and may require the time-current characteristics of two fuses to be plotted on a common current basis. Fuses are selected so that the minor branch fuse disconnects its circuit well before the supplying, major fuse starts to melt. In this way, only the faulty circuit is interrupted with minimal disturbance to other circuits fed by a common supplying fuse.