Response Time:	Medium
DC Cold Resistance:	0.085 Ohms
Size / Dimension:	0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
Color:	--
Operating Temperature:	-40°C ~ 85°C
Approvals:	cULus
Melting I²t:	0.64
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Through Hole
Package / Case:	Radial, Box
Series:	TE5® 398
Voltage Rating - DC:	65V
Voltage Rating - AC:	65V
Current Rating:	800mA
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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39808000000 Fuses: Application Field and Working Principle

Introduction

Fuses are components of an electrical system which protect circuits from overload and short circuit. Fuses are always rated for specific voltages, current ratings, and interrupting ratings. In industrial applications, they are used mostly to prevent damage to expensive equipment or in systems where mission-critical operations occur. Fuses come in various shapes and sizes, and may be divided into four main categories: fast-blow, time-delay, current-limiting, and semiconductor.

Fast-Blow Fuses

Fast-blow fuses are the most commonly used type of fuse and are designed to protect circuits from excessive current. These fuses are designed to blow quickly when the current flow exceeds its rated value and are suitable for devices that draw a significant amount of current, such as motors. Typical application fields include current-limiting circuit breakers, circuit protection in motor starters, and electronic protection of overloads.In a typical fast-blow fuse, the heat generated by the current flowing through the fuse melts the internal fusible element, which then opens, breaking the circuit. The heat generated by the current is proportional to the square of the value of the current. Therefore, even smaller values of current can cause the fuse to blow if there is a high level of current for an extended period of time.

Time-Delay Fuses

Time-delay fuses are designed to open after an excessive current flows in the circuit for a certain period of time. These types of fuses are designed to protect motors, transformers, and other devices from short circuits and overloads. They are also commonly used to protect devices from inrush currents which occur during power turns on. Time-delay fuses come in various time ratings, ranging from a few milliseconds up to several minutes.In a time-delay fuse, current is sensed by an internal coil which is mounted around a spring or other flexible element. When the current passes through the internal coil, it generates a magnetic field which causes the spring to elongate. At a specified current value, the spring will fully elongate, allowing the fusible element to open and break the circuit.

Current-Limiting Fuses

Current-limiting fuses are designed to protect devices from short circuits and to prevent excess current flow in the circuit. These fuses are designed to quickly open the circuit when an excessive current is detected and can provide protection from currents up to several thousand amperes. Typical applications for current-limiting fuses include power supplies, audio amplifiers, power tools, and industrial equipment.These types of fuses incorporate a special element which will react and open the circuit if the current exceeds the fuse rating. The fuse element is normally in a "closed" state, which allows current to pass through. If the current exceeds the fuse rating, the fuse will quickly open and break the circuit.

Semiconductor Fuses

Semiconductor fuses are designed to protect devices from over-current and short circuits in high current applications. These fuses are mainly used to protect integrated circuits and sensitive electronics in devices such as laptops and cell phones.In a semiconductor fuse, the current is sensed by an internal P-I-N diode. The current flowing through the fuse causes the diode to become reverse biased. When the current exceeds a certain value, the diode will become forward biased, causing the fuse to open and break the circuit.

Conclusion

Fuses are an essential part of any electrical system and are used to protect circuits from overloads and short circuits. There are several types of fuses available, including fast-blow, time-delay, current-limiting, and semiconductor. Each type of fuse is designed to protect a specific type of device or system from the damaging effects of excessive current.It is important to select the appropriate fuse for the application to ensure the system is adequately protected from electrical hazards. It is also important to ensure the fuse is rated correctly to ensure that excessive current does not damage the system or cause a fire.

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