RXEF005-2 Circuit Protection

Resistance - Initial (Ri) (Min):	7.3 Ohms
Approvals:	CQC, CSA, TUV, UL
Lead Spacing:	0.199" (5.05mm)
Thickness (Max):	--
Height - Seated (Max):	0.327" (8.30mm)
Size / Dimension:	0.315" Dia x 0.120" W (8.00mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	20 Ohms
Series:	PolySwitch®, RXEF
Time to Trip:	5s
Current - Trip (It):	100mA
Current - Hold (Ih) (Max):	50mA
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses

PTC (positive temperature coefficient) resettable fuses, also commonly known as polyfuse or self-resetting fuses, are an important component in modern electronic devices. They are designed to provide constant over-current protection, meaning it can automatically disconnect when current exceeds its rated limit. The PTC resettable fuse, designated RXEF005-2, is an example of a component that offers that type of protection. In this article, we will discuss the application field and working principle of the RXEF005-2 resettable fuse.

Application Field

The RXEF005-2 resettable fuse is an ideal solution for protecting lithium battery packs, USB ports, and other main power lines. It responds quickly to detect and disconnect over-current and will reset automatically when the current drops to a safe level. The fuse is rated for 250 volts and its rated current is 5A, although it has a temperature rise of 180 degrees Celsius during operation. It has low resistance and is a very cost-effective choice, making it ideal for many applications.

Working Principle

The RXEF005-2 resettable fuse works by using a PTC element. The element consists of a temperature-sensitive passive resistor, which increases in resistance with increasing temperature. When current flows through the fuse, it heats up, causing the resistor to increase in resistance until it is high enough to limit the current. When the current drops, the element cools and the resistance decreases, resetting the fuse and allowing current to flow through the circuit again.The PTC resettable fuse is a sealed device, which features a unique construction to ensure it does not fail during an over-current event. The construction consists of multiple layers of PTC material, which are pressed together and sealed with a strong pressure bond. This ensures that current only flows if the layers form a complete circuit. Additionally, the design ensures that any over-current event will cause the layers to separate, breaking the circuit and disconnecting the fuse.

Conclusion

In conclusion, the RXEF005-2 resettable fuse is an ideal choice for applications that require constant over-current protection. Its unique construction and low cost make it an attractive option for many applications. It is also easy to install and use and provides reliable protection against over-current events. As such, it is an important component in modern electronic devices.

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