19811250001

Response Time:	Slow
Size / Dimension:	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Color:	--
Operating Temperature:	--
Approvals:	CSA, UL
Melting I²t:	15
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Holder
Package / Case:	5mm x 20mm
Series:	198
Voltage Rating - AC:	250V
Current Rating:	1.25A
Fuse Type:	Cartridge, Glass
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Fuses: Application field and working principle

Fuses are an integral and familiar part of the modern electrical industry. They are used to protect electrical circuits from dangerous levels of current, usually in the form of short circuits or overload conditions. The fuses commonly used in power distribution and power protection systems are: fast-acting or ferrule-style fuses, clipsal fuses and ceramic fuses.

Application Field

Fuses are used in a variety of applications including automotive and industrial, telecommunications, solar energy, electronics, medical equipment, HVAC and other power protection applications. Fuses are often used to protect safety-critical equipment or circuits such as those in industrial machinery, as well as to protect household items from overload or short circuits.

Working Principle

A fuse is a type of electrical component that contains a short wire known as a fuse link. When current is flowing through the fuse, the link begins to heat up due to the resistance of the metal in it. Once the current reaches a maximum safe level, the link will heat up until it melts or breaks, thus interrupting the current flow.The selection of a fuse is quite important as it must be able to handle the current that is expected to pass through it. Generally, a fuse should be rated at a current value that is slightly higher than the continuous load current, but lower than the maximum surge or fault currents that may flow through it. As the current flowing through a fuse increases, so does the associated heat build-up. If too much heat is produced, the link will melt or break, interrupting the current flow.

Types

Fast-acting or ferrule-style fuses consist of a metal enclosure with an internal or external fuse element and terminal posts for connecting the wires. The fuse element is usually composed of a wire element or strip which is made of a special alloy that melts quickly when subjected to heat. This type of fuse is designed to open quickly under overload or short-circuit conditions.The clipsal fuse uses metal contacts, usually copper, brass or aluminum, which are held together by a spring clamp mechanism. When the current reaches the maximum safe level, the metal contacts expand due to heat, break the contact, and open the circuit. These fuses tend to be more reliable and durable than other types and are typically used in appliance, automotive, and other applications.Ceramic fuses are made of a combination of ceramic material and metal strips. The metal strips are similar to those used in fast-acting fuses, but they are encased in ceramic. The ceramic material helps to distribute the heat and keeps the fuse cool. When the current level exceeds the maximum allowable, the metal strips will melt, thus interrupting the current.

Advantages

Fuses have a few advantages over other power protection devices. They are designed to react quickly to high current levels, which limits the amount of potential damage to devices or circuits. Additionally, fuses are relatively low cost and are easy to install. This makes them ideal for applications where fast and reliable power protection is required.

Disadvantages

The main disadvantage of fuses is that they need to be replaced once they trip. This process can be time consuming and costly. Additionally, if a fault is not properly diagnosed, the fuse may continue to trip each time it is reset. This can lead to further damage to the circuit or device due to the repeated tripping.

Conclusion

Fuses are widely used in a variety of applications due to their quick-reacting and cost-efficient nature. They are designed to protect circuits from dangerous levels of current, usually in the form of short circuits or overload conditions. The selection of the proper fuse size and type is essential for correct and reliable protection. Fuses come in various types, such as fast-acting or ferrule-style, clipsal and ceramic, each with their own advantages and disadvantages.

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