39912500000

Series:	TE5® 399
Packaging:	Tape & Box (TB)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Fuse Type:	Board Mount (Cartridge Style Excluded)
Current Rating:	2.5A
Voltage Rating - AC:	65V
Voltage Rating - DC:	65V
Response Time:	Slow
Package / Case:	Radial, Box
Mounting Type:	Through Hole
Breaking Capacity @ Rated Voltage:	50A
Melting I²t:	20
Approvals:	cULus
Operating Temperature:	-40°C ~ 85°C
Color:	--
Size / Dimension:	0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
DC Cold Resistance:	0.017 Ohms

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Fuses – 39912500000 Applications Field and Working Principle

Fuses are one of the most common safety devices used in electrical circuits. They are intended to protect electronic and electrical equipment from damage due to overcurrents. This article will discuss their application fields and working principles.

Application Fields

Fuses are used in a wide variety of industries and applications. They are used in domestic and commercial installations, industrial machinery, appliances, telecommunications equipment, electric motors, and photovoltaic systems. Fuses are most commonly found in appliances such as wall sockets, household circuits, and computer systems.

Types

Fuses come in many forms and vary in size and design. The two main categories of fuses are cartridge fuses and blade fuses. Cartridge fuses are the most common type of fuse, and are cylinder-shaped and self-contained. Blade fuses are designed to fit around the terminals of a circuit board and have two metal blades that protrude from them.

Working Principle

The working principle of a fuse is relatively simple. Fuses are designed to open a circuit if the current flowing through them exceeds a certain threshold. The current flowing through a fuse is always proportional to the voltage across the fuse. When the voltage across the fuse exceeds a certain threshold (known as the “breakpoint”), the fuse is designed to melt and break the circuit open. This prevents excessive current from flowing through the circuit, thereby protecting the electronic devices connected to it.

Symbols

Fuses are represented by a symbol in electrical diagrams. The symbol consists of two parallel vertical lines enclosing a circle. This symbol is used to denote the presence of a fuse in the circuit diagram.

Construction

Fuses are composed of a container made of metal or ceramic, a metal wire element, and a terminal. The metal element is the most important part of a fuse, as it contains the fusible material which is designed to melt when heated. This material is typically an alloy of lead, tin, and zinc. The metal element is connected to the terminals, which are connected to the circuit.

Testing

Fuses should be inspected and tested regularly to ensure they are in good working condition. A visual inspection of the assembled fuse should be carried out, and any damaged or loose components should be replaced. A multimeter can also be used to test the fuse for any electrical path.

Limitations

Although fuses provide a high level of protection, they also have some limitations. If the current flowing through the fuse exceeds the breakpoint, the fuse will open the circuit and cause the device to shut down. This can be inconvenient in some cases. In addition, if the fuse has been exposed to current for a long period of time, the fusible material in the fuse can be damaged, which can lead to poor protection and even circuit failure.

Conclusion

Fuses are essential safety devices used in electrical circuits to protect electronic and electrical equipment from damage due to overcurrents. Fuses are available in many different forms and sizes, and have a wide range of application fields. The working principle of a fuse is based on its ability to open the circuit if the current exceeds a certain threshold. In addition, they should be tested and inspected regularly to ensure they are in good working condition.

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