2070.0010.11

Response Time:	Fast
Size / Dimension:	0.433" L x 0.181" W x 0.154" H (11.00mm x 4.60mm x 3.90mm)
Color:	--
Operating Temperature:	-40°C ~ 125°C
Approvals:	cURus, VDE
Melting I²t:	0.012
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Surface Mount
Package / Case:	2-SMD, J-Lead
Series:	OSU 250
Voltage Rating - DC:	250V
Voltage Rating - AC:	250V
Current Rating:	250mA
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Fuses

The application field and working principle of fuses has seen substantial progress since the inception of the technology in the late 1800s. Fuses are designed to prevent serious damage to electrical equipment caused by excessive current. Fuses are commonly used in circuits to protect against excess current or short circuits, and are classified by characteristics such as operating voltages and currents, temperature ratings and physical size.

History

Fuses first appeared in the late 1800s, with the introduction of the first fuse designed by Thomas Edison. These early fuses were relatively simple devices and worked by changing the resistance of a circuit when the current exceeded a certain limit. The fuses were inserted into hot wires in order to avoid the possibility of an electrical fire which could cause destruction to both life and property. Over the years, the technology was improved upon and eventually derived into the modern day fuses.

Properties

Fuses are designed to operate on different properties depending on the application. For example, a time-delay fuse has a longer operating time, allowing it to withstand sudden surges of current until a more gradual decrease in current. Fast-acting fuses, on the other hand, operate quickly to prevent significant damage to the circuit. Temperature ratings define maximum operating temperatures and the maximum current that the fuse will allow before operating. Fuses also come in various physical sizes, some designed for easy replacement and others for permanent installation.

Working Principle

Fuses use the principle of melting when an electrical current exceeds a certain point. The fuse has a narrow gap in the element that holds a thin wire, usually made of copper or aluminium. The wire melts when the current passes through it, breaking the circuit and preventing damage to the equipment. When this happens, the fuse needs to be replaced in order to restore the circuit.

Types of Fuses

There are many types of fuses available on the market, designed to offer a range of properties depending on the application. The two main types of fuses are low voltage and high voltage, also referred to as automotive and industrial fuses. Low voltage fuses are designed to protect circuits with voltages between 6 and 60 volts and they are available in a wide variety of sizes, from 1/16 to 3/4 inch. High voltage fuses have a much higher rating, typically between 600 and 15000 volts. They are also available in a wide variety of sizes, ranging from 1/4 to 2 inches.

Advantages and Disadvantages

The main advantage of fuses is their ability to protect circuits from over-current conditions. They are relatively inexpensive and easy to install, and can prevent expensive repair costs in the long run. However, they are considered single-use devices and need to be frequently replaced in order to continue to protect the circuit. Additionally, the fuse explodes when overloaded, which can be dangerous to those nearby.

Conclusion

Fuses are effective tools for protecting electrical equipment from excessive current and short circuits. By understanding the application fields and working principles of fuses, we can ensure that our electrical circuits are properly protected and meet the relevant safety standards.

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