Blade fuses, also known as plug-in fuses, come in various types. The following are common
classification methods and corresponding types:
Classified by rated current
Low current fuse: The rated current is usually 1A or less, commonly used to protect some electronic
devices that are sensitive to current, such as small sensors, integrated circuits, etc. These devices have a
low operating current, and low current fuses can quickly cut off the circuit when the current rises
abnormally, preventing equipment damage due to overcurrent.
Medium current fuse: The rated current is generally between 1A and 30A, and it is widely used in
household appliances, automotive electronic systems, and other fields. For example, medium current
fuses may be used in the power circuits of televisions and computers, as well as in the lighting and audio
systems of cars.
High current fuse: rated current greater than 30A, mainly used to protect high-power equipment or
circuits, such as battery management systems for electric vehicles, power circuits for industrial equipment,
etc. These circuits require a large current during normal operation, and high current fuses can withstand
large current loads. At the same time, they can cut off the circuit in a timely manner in case of abnormal
situations such as short circuits, ensuring the safety of equipment and personnel.
Classified by melting speed
Fast fuse: also known as a fast melting fuse, it can quickly melt in the event of overcurrent, usually
cutting off the circuit within a few milliseconds to tens of milliseconds. Suitable for circuits with high
requirements for short-circuit protection, such as semiconductor devices, switching power supplies, etc.
Because the components in these circuits are highly sensitive to overcurrent, quickly melting fuses can
protect them from damage in a timely manner.
Slow melting fuse: also known as delay fuse, it allows for withstanding large overload currents in a
short period of time without melting, and has certain delay characteristics. Usually used for equipment
with starting current surge, such as electric motors, transformers, etc. These devices generate a large
instantaneous current during startup, and slow melting of fuses can prevent accidental melting during
normal startup and provide protection during continuous overcurrent.
Medium speed fuse: The melting speed is between fast melting and slow melting. It can withstand
short-term overload current to a certain extent, and can also quickly melt when the overcurrent situation
persists. Suitable for circuits that require protection against overload and short circuit, such as ordinary
electronic devices and lighting circuits.
Classified by application field
Automotive fuse: specifically designed for automotive electrical systems, with specific dimensions and
electrical performance. Common specifications include MAXI, ATO, ATC, Mini, etc., and colors are also
distinguished according to different rated currents for easy identification and replacement. Car fuses are
used to protect various electrical equipment in cars, such as engine control systems, air conditioning
systems, instrument panels, etc.