A fuse is an electrical safety device in which metal melts and interrupts the circuit when the current becomes too strong or could damage the equipment it is installed to protect. Fuses are a vital part of an electrical distribution system helping protect valuable equipment and preventing fires from excessive current. When too much current passes through the fuse (short for fuse link) the metal link melts when its carrying capacity is exceeded causing an open circuit stopping the flow of electricity.

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What are some of the special features of fuses?

The main features of many fuses involve how they indicate they are blown or have served their purpose; many of those styles are as follows: Fuses can come in glass housings or plug in style that allow for direct inspection of the fusible element. Other types of fuses use other methods of displaying when they are blown or service is interrupted. A "striker pin" can extend out of the fuse cap indicating the element is blown. A "colored disc" in the cap may fall out when blown. Some fuses have an "element window" allowing a visual inspection. A fuse style may have a flag on a spring that is released when blown. External trip indicators can be added to the striker pin using clips to compatible fuses. Some fuses have a micro switch that is triggered when the fuse is blown. The special feature of a fuse is how it indicates when it is blown and performed its function of saving problems.

What is the interrupting rate of a fuse?

Fuses are designed to carry a known current level or amp rating. When the current level (amp rating) exceeds the rated capacity of the fuse it causes the fuse to blow! The maximum current the fuse can safely carry without interruption is referred to as the "interrupting rate".

What do the markings on a fuse mean?

Most fuses have markings on the body, cap or surface that indicate the value of the fuse. When a fuse is blown and needs replacing it is important to interpret these markings correctly as many fuses may look the same and appear the same size but could be used for different applications. Fuse markings will generally convey:

• Ampere rating
• Voltage rating,
• Time-current or speed in which a fuse will blow
• Approvals Manufactured / part number / series
• Breaking capacity