RKEF110

Resistance - Initial (Ri) (Min):	170 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.199" (5.05mm)
Thickness (Max):	--
Height - Seated (Max):	0.591" (15.00mm)
Size / Dimension:	0.299" L x 0.161" W (7.60mm x 4.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	470 mOhms
Series:	PolySwitch®, RKEF
Time to Trip:	3s
Current - Trip (It):	2.2A
Current - Hold (Ih) (Max):	1.1A
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses: RKEF110 application field and working principle

PTC Resettable Fuses, also known as PolyFuse, are commonly used in the industrial environment to auto-reset the current and protect components from damage caused by excessive current. The RKEF110 is such a product; it is a small, SPST (Single Pole - Single Throw) thermal switch which is mostly used as a current fairing device in the low-voltage, low-current circuit.The RKEF110 PTC resettable fuse is a small and low-cost device, with a compact size and a wide range of applications. The RKEF110 is usually formed by two parts, a PTC thermistor and a NTC thermistor. It has a wide voltage range of 0.15VDC to 150VDC and low current rating of 0.25A to 1A. The RKEF110 can be applied in consumer and automotive industry, as well as in the electrical and electronic equipment. It can be used as an over-current protection in the low-voltage circuit and also as a circuit reset switch.When the fuse is used to protect the current, the PTC thermistor functions as a heat sink to dissipate the excess heat caused by the high current and to protect the other components from getting damaged due to overheating. The NTC thermistor acts as an overload protection device which will open the circuit when the current reaches a predefined limit.The operating principle of the RKEF110 PTC resettable fuse is simple. When the current goes through the device, the PTC thermistor absorbs the heat generated by the current, protecting the other components from getting damaged due to overheating. The NTC thermistor will open the circuit when the temperature reaches a critical value, which is set by the manufacturer. After the circuit is reset, the NTC thermistor will open the circuit again when the current reaches a defined limit.The advantages of using the RKEF110 PTC resettable fuse is that it is cheaper and easier to replace compared to other conventional hardware-based fuses. It also has a longer life cycle and is much less prone to wear compared to other alternatives. It is also very easy to install and maintain - the whole process only takes a few minutes.In conclusion, the RKEF110 PTC resettable fuse is a small, low-cost device which is mostly used in the low-voltage, low-current circuit. It is an easy to use and maintain alternative to conventional hardware-based fuses, and is suitable for use in consumer, automotive, and electrical and electronic equipment applications. The overall working principle of the fuse is simple and it offers a greater level of protection compared to other options.

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