3JS 125-R TR

Package / Case:	2AG, 5mm x 15mm (Axial)
DC Cold Resistance:	7.7 Ohms
Size / Dimension:	0.217" Dia x 0.591" L (5.50mm x 15.00mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	CE, CSA, cURus
Melting I²t:	0.107
Breaking Capacity @ Rated Voltage:	100A AC, 150A DC
Mounting Type:	Through Hole
Series:	3JS
Response Time:	Slow
Voltage Rating - DC:	140V
Voltage Rating - AC:	350V
Current Rating:	125mA
Fuse Type:	Cartridge, Glass
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to Fuses

Fuses are an important part of any electrical system. They are used to protect the system from being overloaded and from any short circuits or other malfunctions. They are made up of a metal fuse element that is encased in a protective plastic housing. The element is designed to heat up and eventually melt when the current passing through it exceeds the rated current. This opens the circuit, thus preventing any further current from flowing through and thus protecting the entire system.

Function of Fuses

Fuses function primarily by cutting off the electrical current flow when the current exceeds the rated limit, and they also serve to protect circuits and electrical devices from any kind of short circuit or malfunctions. This means that, when an overload or short circuit occurs, the element in the fuse melts, completely cutting off the electrical current in the circuit and effectively protecting the system from any further damage.

How to Choose a Fuse

When selecting a fuse, it is important to consider the amount of current the circuit will be carrying and the potential risks that may arise from an overload or a malfunction. It is also important to consider the type of fuse to be used. Common types of fuses include ceramic fuses, glass tube fuses, and cartridge fuses. Each type has its own advantages and disadvantages, and all should be taken into account when making a selection.

3JS 125-R TR Application Field and Working Principle

The 3JS 125-R TR is a manual reset fuse that is designed for low-voltage electrical circuits. This fuse is capable of withstanding a current of up to 125 amps, and is well suited for circuits with a low-voltage rating of up to 32 volts. The fuse element is made of a tin-plated metallic alloy and is placed inside a polycarbonate housing, which helps to protect it from any mechanical damage. The working principle of the 3JS 125-R TR is simple. The fuse element is designed to heat up and eventually melt when the current passing through it exceeds the rated current limit. The heat generated by the fuse element causes it to expand and eventually melt, thus interrupting the flow of electricity and preventing any further damage to the system. After the fuse element has melted, it can be manually reset and will be ready to be used again.

Conclusion

In conclusion, fuses are an important part of any electrical system. They are used to protect the system from being overloaded and from any short circuits or other malfunctions. The 3JS 125-R TR is a manual reset fuse that is designed for low-voltage electrical circuits, and is capable of withstanding a current of up to 125 amps. It works by heating up and eventually melting when the current passing through it exceeds the rated current limit, thus breaking the circuit and preventing any further damage to the system.

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