PFRA.250.2.010 Circuit Protection

Resistance - Initial (Ri) (Min):	20 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.232" (5.90mm)
Thickness (Max):	--
Height - Seated (Max):	0.720" (18.30mm)
Size / Dimension:	0.472" L x 0.122" W (12.00mm x 3.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	80 mOhms
Series:	PFRA
Time to Trip:	10.3s
Current - Trip (It):	5A
Current - Hold (Ih) (Max):	2.5A
Current - Max:	40A
Voltage - Max:	30V
Type:	Polymeric
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses

PTC resettable fuses are a type of circuit protection device that can be reused over and over again by "resetting" with an external trigger or switch. When an overload condition is detected, the fuse opens and interrupts the circuit. When the cause of the overload is removed, resetting the fuse restores current flow, and it can be used again. This type of fuse is typically used in low to medium voltage applications and is also sometimes called a "polymeric positive temperature coefficient (PPTC) fuse.

PFRA.250.2.010 Application Field and Working Principle

PFRA.250.2.010 is one model of PTC resettable fuse. This model is designed for use in AC/DC circuit protection in applications such as battery charging, DC dc converters, LED lighting and many other consumer applications. It offers a current rating of 250mA, a voltage rating of125V and is available in either single or dual pack packaging.The operation of the PFRA.250.2.010 is based on a thermally sensitive polymer film. When an overload or short circuit occurs, the current heats up the film and causes it to change shape. This effectively interrupts the current flow and the device operates as an “open” fuse. When the overload condition is removed, the fuse can be reset by pushing a reset switch and allowing the polymer film to cool down and reform its original shape, re-establishing current flow.The PFRA.250.2.010 offers several advantages over traditional fuses. Unlike traditional fuses, which need to be replaced after every overload, the PFRA.250.2.010 can be reset and reused multiple times. This eliminates the need for frequent replacement, greatly reducing the cost of maintenance and downtime. In addition, the PFRA.250.2.010 is typically much smaller and lighter than a traditional fuse, allowing for better portability and easier installation.The PFRA.250.2.010 also has a high operate temperature, meaning it can be used in higher temperature environments than other fuses. It has a high surge withstand capability, enabling it to handle greater current surges than other fuses. And since it is an all-polymer fuse, it is very robust and can withstand shocks, vibration, and other environmental factors.The PFRA.250.2.010 is an ideal device for many applications. Its small size and high current rating make it suitable for use in harsh environments where space is limited, such as in consumer electronics or industrial applications. The ability to be reset allows it to be used in applications where frequent short circuits or overloads occur, such as in battery charging applications. And due to its rugged construction, it can withstand the shocks and vibrations found in automotive and aerospace applications.In summary, the PFRA.250.2.010 is a type of PTC resettable fuse designed for AC/DC circuit protection. It has a current rating of 250mA, a voltage rating of 125V, and can be reset with an external switch. It has several advantages over traditional fuses, such as being able to be reused multiple times, a smaller size, higher operate temperature, and higher surge withstand capability. It is suitable for use in a variety of applications and environments, including consumer electronics, battery charging, automotive, and aerospace.

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