BK1/C519-3-R

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Fuses are safety engineering components used to protect electrical and electronic systems and components from damages caused by overcurrent or overload. They are intentionally designed to melt on the occurrence of a fault, thereby interrupting the electrical circuit. BK1/C519-3-R is one of such kind of fuses widely used in various industrial and household electrical and electronics applications.

BK1/C519-3-R is a ¼ inch (6.3mm) glass body fuse, which features an axial leaded current-limiting miniature fuse with time-delay. It is normally rated as 250V AC, 5A, 5x20mm, rated current 5A, it is suitable for most applications in the industrial and household electrical application fields. It features time-delay such that it is able to create a barrier for any inrush current like it occurs when a motor starts or a transformer is energized. This additional time delay enables it to protect the devices even for such short circuits.

The body is made of ceramic insulating material, and has silver-plated copper end caps. The latter two contain a bi-metal strip which serves as a temperature fuse surrounding the silver-plated contact. The contact is held in place by a metal contact holder. This holder has a metal cap which can be easily removed to access the contact for renewal after use, thus enabling the device to be re-used many times. A built-in resistor reduces voltage drop and provides additional protection from thermal runaways or overvoltage conditions.

The working principle of BK1/C519-3-R is relatively simple. When the allocated current is exceeded, the heat generated melts the bi-metal strip. This will in turn trip the silver-plated contact which makes the electric current interrupted. An arc that is generated when the current trips the fuse is not sufficient to close the contact again, and thus the current will remain interrupted even after the breaker has reset or the overload has been remedied.

Generally, when overload occurs and the operating current is greater than the rated current of the fuse, the bi-metal strip is heated and deformed due to the heat. This deformation will cause the strip to become longer and contact the back of last contact end and separate the two contact parts which will stop the current flow through the circuit. Therefore it protects the devices by interrupting the circuit, as the excess current that exceeds the rated current is insufficient to make the silver-plated contact to close again.

BK1/C519-3-R is a reliable fuse for most applications in industrial and household fields. It is typically used in motor loads, plasma cutting machines, welding equipment, induction heating machines and other similar applications. It features a time-delay that enables it to protect the applications from inrush current. It also features a built-in resistor for reducing the voltage drop and offers additional protection from thermal runaways or overvoltage conditions.

In conclusion, BK1/C519-3-R is a fuse widely used in industrial and household electrical and electronic applications. It has a silver-plated copper end caps containing a bi-metal strip which melts on the occurrence of a fault thereby interrupting the electrical circuit. It also features a time-delay which creates a barrier for any inrush current, a built-in resistor reduces voltage drop and provide additional protection from thermal runaways or overvoltage. It is a reliable and easy to use fuse for most applications.

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