A fuse cuts off the current when the current exceeds a safe value due to short-circuiting or overloading. When the current becomes large it heats the fuse wire too much. Since the melting point of fuse wire is low it melts and breaks the circuit diagram. Cartridge fuses are low-cost electrical safety devices that are used for the overload protection of electrical circuit diagrams and appliances.

A Power Socket is a Device to Which Electrical Devices Can Be Connected to Receive the Electric Current Required For Their Operation. Connected by a System of Cables to a Power Source, Usually, an Electricity Generation Facility operated by an energy Production company, generally has no moving parts. Instead, it contains metal strips that make contact with the prongs of an Electric plug inserted into the socket. It is Through these Contacts That the Electric current is Transmitted. Electrical Devices that connect to a Power Source Through a Power Socket are Considered to be Portable Because they can easily be Connected and Disconnected From the Power Source.

Board indicators are optoelectronic devices that emit light to show the operating condition of a machine or appliance. Manufacturers and distributors use various terminologies for this type of product which can be confusing when trying to power source an item, particularly on-line: Signal lamps. Signal lights. That is an example of an indicator light bulb.