PFMD.020.2

Resistance - Initial (Ri) (Min):	400 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	--
Thickness (Max):	0.043" (1.10mm)
Height - Seated (Max):	--
Size / Dimension:	0.179" L x 0.121" W (4.55mm x 3.07mm)
Package / Case:	1812 (4532 Metric)
Mounting Type:	Surface Mount
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	6 Ohms
Series:	PFMD
Time to Trip:	60ms
Current - Trip (It):	400mA
Current - Hold (Ih) (Max):	200mA
Current - Max:	80A
Voltage - Max:	30V
Type:	Polymeric
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses: Application Field and Working Principle

PTC (Positive Temperature Coefficient) Resettable Fuses,also commonly known as Polyfuse, are essentially solid state overcurrent protection devices used in a broad range of electronic applications including consumer, automotive and industrial applications. They are widely used because of their ability to automatically reset after a short circuit without the need of replacing the failed component. In some cases, traditional fuses need to be replaced with a PTC resettable fuse whenever a short circuit occurs.Furthermore, PTC resettable fuses, with their identification code PFMD.020.2, provide excellent protection against electrical over-currents. By using different types of non-conductive polymeric materials, they are able to protect electronic circuits from electrical faults and short circuits that could damage the device or cause injury. In fact, PTC resettable fuses are one of the most popular and widely used types of over-current protection devices. This is attributed to the features of PTC resettable fuses which is their ability to reset at any point in a short circuit, making them ideal for use in all types of electronic applications.This article will explore the working principle and application areas of PTC resettable fuses with their identification code PFMD.020.2.

Working Principle of PTC Resettable Fuses

The working principle of PTC resettable fuses is based on the positive temperature coefficient (PTC) materials. These materials are made up of a combination of materials, such as polyester, polypropylene, and other thermoplastics. When the current flow through the PTC resettable fuse exceeds the threshold, it will increase the temperature. This sudden increase in temperature will cause the thermoplastic materials to expand with heat, thereby changing the shape of the fuse. This creates a \'clash\' which impedes the overhead current and thus creating a resistance large enough to protect the device. This clash will remain even after the circuit is disconnected, and slowly over time, the fuse will return to its original shape as the temperature decreases. This allows the PTC resettable fuse to restore the circuit to its original condition, and offers repeatable protection against short circuits.

Application Areas of PTC Resettable Fuses

PTC resettable fuses with their identification code PFMD.020.2 are widely used in a wide range of electronic applications, including consumer, automotive, and industrial applications. As they do not need to be replaced in the event of a short circuit, they are an efficient and cost-effective way to protect electronic devices from electrical over-currents. In consumer applications, PFMD.020.2 PTC resettable fuses are commonly used to protect devices such as mobile phones, digital cameras, wearable devices, and other personal electronic gadgets. As these gadgets are exposed to repetitive use, PTC resettable fuses ensure their safety by providing reliable over-current protection.When it comes to industrial applications, these fuses are used to protect industrial equipment such as motor controls, HVAC systems, and communication systems. By using PTC resettable fuses, companies can protect their equipment from potential short circuit or overloads, ensuring the longevity of their equipment and protecting their business from unnecessary losses.In automotive applications, PFMD.020.2 PTC resettable fuses are used to protect electronic components such as ECUs and other components from potential short circuits. These fuses can be used to protect both internal and external components, ensuring the safe and efficient operation of cars and other automobiles.

Conclusion

In conclusion, PTC resettable fuses with their identification code PFMD.020.2 are used in a wide range of electronic applications. They quickly detect and block electrical over-currents, and can auto-reset after a short circuit without having to replace the failed component. This makes them an ideal choice for consumer, automotive, and industrial applications.

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