PFRA.030.3

Resistance - Initial (Ri) (Min):	760 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.528" (13.40mm)
Size / Dimension:	0.291" Dia x 0.122" W (7.40mm x 3.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	2.1 Ohms
Series:	PFRA
Time to Trip:	3s
Current - Trip (It):	600mA
Current - Hold (Ih) (Max):	300mA
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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PTC resettable fuses, also referred to as polymeric positive temperature coefficient resettable devices, offer overcurrent protection for electrical systems and equipment. These fuses are used to protect circuits from unexpected surges or power fluctuations, preventing costly replacement of components and reducing downtime from electrical failure. The PFRA030.3 is one of the most common varieties of resettable fuses, and its application field and working principles are discussed in this article.The PFRA030.3 is typically used as a replacement for traditional fuses or circuit breakers and is designed for easy installation and maintenance. The fuse\'s main application field is as an overcurrent protection device in telecommunications, automotive, medical and consumer electronics systems. It is also used in low-voltage applications such as battery back-up systems, backup alarm systems, DC-DC converters, lighting systems and various industrial and consumer power supplies.The working principle of the PFRA030.3 is relatively simple. The fuse has an internal temperature-sensitive element that is connected to an impedance element. When the current flowing through the circuit exceeds a certain threshold, the temperature of the base element rapidly increases, causing the impedance element to heat up and eventually reach its trip point. At this point, the impedance element (a metal alloy) melts, effectively breaking the circuit and preventing further current flow.The key benefit of using a PFRA030.3 over traditional fuses or circuit breakers is that it can be easily reset after each fault. This reduces the time and cost associated with resetting and replacing fuses or circuit breakers. The fuse also offers thermal protection against overheating, which can help protect sensitive components and prevent expensive damage.The PFRA030.3 is one of the most widely used resettable fuses available, offering reliable protection against sudden surges or power fluctuations. It is designed for easy installation and maintenance, and can be reset quickly and easily with minimal cost and time. It is an ideal solution for low-voltage and consumer applications, offering thermal protection against overheating and reliable protection against unexpected faults.

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