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Fuses

A fuse, or fuse element, is a type of electrical safety device which is mainly used to protect electrical circuits and equipment from damage caused by overload or a short circuit. It is typically a thin metal strip which melts when the current passing through it increases beyond a certain limit. Once the internal fuse element is melted, the device interrupts the circuit, thereby preventing further damage to the circuit or equipment.

BP/MDL-1/2 Application Field and Working Principle

BP/MDL-1/2 fuses are designed for the protection of low and medium voltage electrical supplies, specifically designed for use in switchgear and control gear, typically in motor protection applications. They are typically current limiting devices which combine the advantages of both ordinary fuses and circuit-breakers. Their purpose is, like an ordinary fuse, to provide protective relaying, but in a much faster manner than with an ordinary fuse.

BP/MDL-1/2 fuses are operated by two principal mechanisms of protection: magnetic and thermal. Magnetic protection is achieved by the arc extinguishing system which accommodates the high fault current and allows the arc to break quickly. Thermal protection is achieved by providing a fuse element that melts when exposed to a fault current that is too high or too prolonged.

The electrical operation of the BP/MDL-1/2 fuse relies on their magnetic field strength and will work to disconnect a fault within a few microseconds. Also, since the fuses are designed to be iris-type and self-extinguishing, the fuse will not allow re-striking of the fault ensuring a higher degree of protection against electrical surges. Furthermore, these fuses also incorporate an internal latch mechanism which enables the fuse to remain open even when the current clears so as to prevent arcing during the reconnecting phase.

The main purpose of a BP/MDL-1/2 fuse is to provide over-current protection to a circuit or equipment. However, they can also be used for over-voltage protection. To achieve this, the fuse incorporates an embedded thermal element which trips when the voltage of the circuit reaches a preset level. This ensures that the circuit is not damaged due to an excessively high voltage.

BP/MDL-1/2 fuses are designed to provide a quick and efficient method of protecting electrical equipment and circuits in the event of an overcurrent or short-circuit situation. By combining the advantages of an ordinary fuse and a circuit-breaker, they provide both excellent protection from electrical surges and protection against damaging levels of current with a fast speed of operation.

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