RUEF110S

Resistance - Initial (Ri) (Min):	70 mOhms
Approvals:	CQC, CSA, TUV, UL
Lead Spacing:	0.199" (5.05mm)
Thickness (Max):	--
Height - Seated (Max):	0.559" (14.20mm)
Size / Dimension:	0.291" L x 0.118" W (7.40mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	170 mOhms
Series:	PolySwitch®, RUEF
Time to Trip:	6.6s
Current - Trip (It):	2.2A
Current - Hold (Ih) (Max):	1.1A
Current - Max:	100A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

PTC Resettable Fuses, known as Polymeric Positive Temperature Coefficient (PPTC) resettable fuses, are devices made of a specially formulated polymeric material that are capable of protecting electronic circuits against overloads and short-circuiting. Its most unique feature is that it is self-resettable, meaning that its fuse reset itself after the fault that caused the fuse to trip is eliminated. The RUEF110S is a typical PTC device, which is widely used in industries for different applications.

RUEF110S Application Fields

The RUEF110S application fields mainly include Information Technology, Consumer Electronics and Energy industries. In Information Technology, this device is used to protect peripheral devices such as USB hubs, chargers, and power supplies from overloads and short circuits. It is also used as general purpose power fuses for protection against surges and power disturbances. In the Consumer Electronics industry, the device is used to protect consumer products such as digital cameras, stereos, and computers from electrical surges. Finally, in the Energy industry, the device is used to protect expensive equipment from electrical and power surges.

RUEF110S Working Principle

A RUEF110S is composed of two terminals – the anode and the cathode. When the fuse is subjected to an unsafe over-current, the polymeric material inside the fuse heats up and becomes less conductive, thus reducing the amount of current passing through the device. This reduction in current causes a drop in voltage, which trips the fuse and disconnects the circuit. The reason why the PTC Resettable Fuses are able to self-reset is because of its structure. When the fault condition has been rectified, the body’s temperature will cause the polymeric material to become more conductive and allow current to pass again.

Conclusion

The RUEF110S resettable fuse is a very efficient type of PTC device used to protect electronic circuits from overloads and short-circuiting. It has a wide application field, including Information Technology, Consumer Electronics and the Energy industry. In addition, its working principle is based on the polymeric material inside it becoming less conductive when subjected to an unsafe over-current, thus allowing the device to self-reset when the fault condition has been rectified.

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