normally open vs normally closed

　　Classification of fuses

　　There are various ways to classify fuses, and the following are common classifications:

　　Classified by structural form

　　Plug in fuse: This type of fuse has a simple structure and is usually composed of a porcelain base and a plug. There is a fuse installed on the plugin, and when the fuse is blown, the plugin can be easily removed for replacement. It is mainly used in circuits with low current and low voltage, such as home lighting circuits.

　　Spiral fuse: It consists of a ceramic cap, fuse tube, and base. The melting tube is equipped with a fuse, which can be installed on or removed from the base by rotating the ceramic cap. The advantage of this type of fuse is that it is relatively easy to replace the fuse, and after the fuse inside the fuse tube is blown, there will be a clear indication, which is convenient for detecting faults. It is suitable for small and medium-sized circuits, such as control circuits for electric motors.

　　Enclosed fuse: The fuse of this type of fuse is enclosed in a casing, which can be made of metal or ceramic. It has good protective performance and can prevent the arc and metal splashing generated when the fuse is blown from affecting the surrounding environment. It is commonly used in situations that require high security, such as industrial control systems.

　　Classified by the range of breaking current

　　General purpose fuse: This type of fuse is suitable for protecting general electrical equipment and can break normal overload current and short-circuit current. Its rated current range is wide and can meet the protection needs of most common circuits.

　　High breaking capacity fuse: mainly used in situations where fast breaking of large currents is required, such as in power systems. It can quickly interrupt huge short-circuit currents, prevent the expansion of faults, and protect the safety of power equipment.

　　Classified by usage category

　　G-type fuse: usually used to protect cables and wires, etc. Its melting characteristics are designed based on the overload characteristics of cables and wires, which can melt in a timely manner when cables and wires are overloaded, protecting the safety of the circuit.

　　M-type fuse: mainly used to protect equipment such as electric motors. It takes into account the high current impact during motor start-up, and will not accidentally melt during the motor start-up process. However, it can quickly melt in case of motor failure, providing protection.

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