3JQ 750

Series:	3JQ
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Fuse Type:	Cartridge, Glass
Current Rating:	750mA
Voltage Rating - AC:	350V
Voltage Rating - DC:	140V
Response Time:	Fast
Package / Case:	2AG, 5mm x 15mm (Axial)
Mounting Type:	Through Hole
Breaking Capacity @ Rated Voltage:	100A AC, 150A DC
Melting I²t:	0.26
Approvals:	CE, CSA, cURus
Operating Temperature:	-55°C ~ 125°C
Color:	--
Size / Dimension:	0.217" Dia x 0.591" L (5.50mm x 15.00mm)
DC Cold Resistance:	0.354 Ohms

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Fuses

Fuses are designed to protect an entire electrical circuit from damage or destruction due to an excessive current that could exceed its rated value. These devices are integral components of electrical systems and are necessary for the safety of both the system and its users. A 3JQ 750 fuse is a special type of device that combines two important functions of a fuse into a single unit, the time-delay feature and the overload protection.

3JQ 750 Application Field and Working Principle

The 3JQ 750 fuse is designed for applications where the maximum current is 750 amperes. This fuse is typically used in a single-phase distribution system, such as in an industrial power supply application. This type of fuse also provides a time-delay feature, which is essential for the protection of large installations where there is a high risk of overload currents.The fuse also includes a mechanism to slow the flow of current, allowing it to reach a stable state of equilibrium before the fuse element blows. Thus, the 3JQ 750 fuse provides both overload protection and time-delay operation, both in a single unit.The fuse element within the 3JQ 750 is made of a specially designed material that can withstand large currents without melting. The element is designed to have an initial resistance that is lower than the maximum current rating so that any overcurrent passing through the fuse will cause it to blow. This protects the system from any overcurrent that can damage the system components.The time-delay feature of the 3JQ 750 allows for a slow build-up of current through the fuse before it blows, protecting the system from sudden and large changes in current. The duration of the time-delay is adjustable, allowing for different applications with different timing requirements.

Conclusion

The 3JQ 750 fuse is a reliable and effective protection device that combines the features of both a time-delay fuse and an overload protection fuse. This makes it the ideal device for protecting large installations from both sudden overloads and slow, long-term overcurrents. The adjustable time-delay feature and the durable construction of the element make it a reliable and safe choice for any large-scale electrical system.

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