24LT100SU

Resistance - Initial (Ri) (Min):	70 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.039" (1.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.866" L x 0.199" W (22.00mm x 5.05mm)
Package / Case:	Strap
Mounting Type:	User Defined
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	260 mOhms
Series:	POLY-FUSE®, LT
Time to Trip:	7s
Current - Trip (It):	2.5A
Current - Hold (Ih) (Max):	1A
Current - Max:	100A
Voltage - Max:	24V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Overview of PTC Resettable Fuses

PTC resettable fuses (Polymeric positive temperature coefficient) are self-compensating components that protect circuits from overcurrents and short circuits. As their name implies, PTC resettable fuses are designed to detect and react to current overloads and reset themselves after the fault has been cleared. As a type of semiconductor device, this type of fuse is highly suited for use in consumer electronics products, automotive and aerospace applications, industrial controllers, and a wide range of other electronic circuits.

The 24LT100SU Application Field and Working Principle

The 24LT100SU PTC resettable fuse from CITIZEN FUSES is a fully-qualified in-line resettable fuse rated for use up to 100VAC or 150VDC. It is suited for a wide range of applications, including LED lighting, audio equipment, power supplies, and automotive device, such as DC motors and sensors. It is an excellent choice for use in regions that require UL and/or RoHS certification. The 24LT100SU is designed to react to overcurrents and short circuits quickly, allowing the device to open and protect circuits from damage without the need for manual reset. During normal operation, its positive temperature coefficient (PTC) feature allows the device to self-compensate based on its temperature. When the device reaches its overcurrent trigger point, PTC responds and opens the circuit. As the fuse cools, its low self-resistance snaps back to its original state, allowing normal operation to resume.

Pros and Cons

Because of its advanced safety features and simple operation, PTC resettable fuses offer an excellent solution for a wide range of applications. In addition to being readily available and cost-effective, these fuses can be reused and are designed to function well in high-temperature environments. They are also much easier to install and replace than standard fuses. However, PTC fuses also come with some downsides. For one, these fuses take longer to react than other types of fuses, and can sometimes fail to protect circuits from extreme currents. In addition, PTC fuses are not designed for use in outdoor applications and will become less effective over time. Finally, PTC resettable fuses have limited current ratings and must be replaced when the fuse manufacturer’s maximum current rating is exceeded.

Conclusion

The 24LT100SU PTC resettable fuse is an excellent choice for applications in which safety and reliability are paramount. Its ability to detect and react quickly to overcurrents and short circuits, as well as its self-compensating design make it an ideal choice for a wide range of consumer, automotive, industrial, and aerospace applications. While the fuse does have its limitations, its cost-effectiveness and ease of use make it a great choice for many circuit protection needs.

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