40008000000

Package / Case:	Radial, Box
DC Cold Resistance:	0.10025 Ohms
Size / Dimension:	0.335" L x 0.158" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
Color:	--
Operating Temperature:	-40°C ~ 125°C
Approvals:	CQC, cULus, KC, VDE
Melting I²t:	6.72
Breaking Capacity @ Rated Voltage:	130A
Mounting Type:	Through Hole
Series:	TE5® 400
Response Time:	Slow
Voltage Rating - AC:	250V
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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Introduction to Fuses

Fuses are an important electrical component used in a wide variety of systems for protection or control. Fuses protect against over-current and over-voltage events, maintain the integrity of power supplies, and can reduce the risk of serious accidents due to electrical failure.

Applications of Fuses

Fuses are most commonly found in home and commercial electrical circuits. These include the basic single-phase, two-phase, and three-phase circuits, as well as complex motor control and power distribution systems. In addition, fuses are essential components in the aerospace, automotive, medical, and industrial fields.The most common applications for fuses include circuit protection, flow control, surge protection, and power distribution. With circuit protection, fuses act as a barrier between current and the wire, providing a break that prevents further damage from occurring. Flow control fuses are typically used in motorized equipment to protect against excess current or voltage, which can cause short-circuiting or damage to the motor. Surge protection fuses are used to protect electronic circuits against large, damaging surges of current caused by events such as lightning strikes or power outages. Finally, power distribution fuses are used in larger power systems to ensure the safety of personnel and equipment and reduce the risk of shocks or fires due to excessive current.

Types of Fuses

There are a wide variety of fuse types available. Some of the most common types are:

• Cartridge – Used in most electrical systems to protect against overcurrents
• Time-Delay – Allow a higher current for a short period of time, before breaking the circuit
• High-Voltage – Used to protect larger circuits against surges of over-voltage currents
• High-Current – Used in industrial applications to protect circuits against overloading
• Fast-Acting – Breaks a circuit when a short-term overcurrent is detected
• Low-Voltage – Used to protect low-voltage circuits from overvoltage or short-circuiting

Working Principle of Fuses

The basic principle behind fuses is that when the current passing through a circuit exceeds the rating of a fuse, it will heat up due to the increased current flow. This heat will cause the fuse to melt, thereby breaking the circuit. When the fuse melts, the current flow will decrease, ensuring the circuit does not carry too much current. Fuses are designed to blow before the wire they are protecting can get hot enough to start a fire.

Conclusion

Fuses are an essential component used to protect and control electrical circuits. They are used in homes, industrial settings, and other applications to protect against overcurrent, overvoltage, short circuits, and surges of current. Fuses come in many different types, each designed to protect different types of circuits from specific issues. The working principle of fuses is simple: when the current flowing through a circuit exceeds the rating of a fuse, it will heat up and melt, thereby breaking the circuit.

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