SF-0402F400-2 Circuit Protection

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Fuses protect electrical and electronic circuits by breaking the circuit and stopping the flow of excessive current. SF-0402F400-2 fuse is a board-level fuse used in miniature electrical circuits. It is rated at 400 mA (AC) and 2 mm in size. The higher mA rating is, the more amount of current the fuse can withstand.

This SF-0402F400-2 fuse has a wide application field. It can be used in DC power distribution, electrical boards, power supplies, digital monitoring devices, control equipment, marine industry devices, etc. Its ultra-small size makes it ideal to be used in devices such as cell phones, computers, printers, and other portable electronic devices.

SF-0402F400-2 fuses function by responding to an overload of current and breaking the circuit to prevent excessive current from passing through the circuit, thus protecting the electrical devices. This type of fuse is composed of three parts: the upper part containing the fuse element, the middle part containing the contact terminals and the lower part containing the fuse box which encases the other two parts.

The fuse element of SF-0402F400-2 fuse consists of a strip of metal wire encased in a blended ceramic to resist high temperature exposure. The wire is wound to form a spiral of increasing size. The contact terminals at the center are connected to the supply circuit. When the current passes through the spiral, the heat generated melts the metal wire and breaks the circuit.

The fuse box housing contains a movable latch to secure the fuse. The box protects the fuse elements from being exposed and from being easily displaced due to vibration. The box also prevents air or humidity coming into contact with the fuse element.

The working principle of the SF-0402F400-2 fuse is based on excess current protection in an electrical circuit. When the current passing through the circuit rises above its rating, the fuse element melts due to the excessive heat generated, breaking the circuit and preventing further damage. The fuse box also prevents short-circuiting and further prevents hazardous situations.

The SF-0402F400-2 fuse is widely used in miniaturized electrical systems. It provides current protection in DC power distribution, electrical boards, power supplies, digital monitoring devices, control equipment, marine industry devices, cell phones, computers, printers, and other portable electronic devices. The fuse box protects the fuse elements from being exposed and from being easily displaced due to vibration. The working principle of the fuse is to break the circuit when the current passing through the circuit rises above its rating, thus protecting the electrical devices from damage. Although it is a small device, it has a big role to play in safety and reliability of electrical systems.

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