PFRA.030.2 Circuit Protection

Resistance - Initial (Ri) (Min):	760 mOhms
Approvals:	cURus, TUV
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:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

PTC Resettable Fuses are a unique type of fuse that can reset itself without having to be replaced. The PTC Resettable Fuse, or PFRA.030.2, is a specially designed polymeric positive temperature coefficient (PPTC) device that comes with various use capabilities. It helps ensure the integrity of wired circuit applications where redundant protection is beneficial or necessary and is used in a variety of consumer and industrial electronics, telecommunication, automotive, and power distribution devices. This article will discuss the application field and working principle of the PTC Resettable Fuse that is required to ensure safety standards, reduce downtime, minimize maintenance, and guarantee efficient longevity in electronic devices.

Application Field and Working Principle

The PTC Resettable Fuse, or PFRA.030.2, was created to protect circuits and electronic components against over-current conditions. This type of fuse eliminates the issue of needing regular fuse replacements and maintains a consistent level of protection. They are especially useful in applications where input voltage may be in excess of what the circuit can handle, such as automotive power systems, telecommunication systems, and medical equipment.PTC Resettable Fuses have two main components: a specially designed polymeric material that exhibits the positive temperature coefficient and a trace heater. The trace heater is designed to carry current until it surpasses a predetermined level. Once this level is exceeded, the PTC begins to heat up, making it more difficult for the trace heater and resulting in the gradual increase in resistance. This further reduces the current until it reaches a dangerously low level and causes the current to be limited to an acceptable level.The PFRA.030.2 has a wide range of useful characteristics that help make it effective in a variety of applications. It has an instantaneous built in response time to prevent circuit damage due to over-current conditions, has a high interrupting capacity that ensures a safe level of protection for the circuit, and has a wide range of trip points that can be adjusted for different input levels and fuse ratings. Additionally, it is designed to be self-resetting in the case of a short-circuit, eliminating the issue of having to replace a fuse with each overload condition.

Conclusion

PTC Resettable Fuses are a unique type of fuse that can reset itself without having to be replaced, making them very advantageous in applications where input voltage may be in excess of what the circuit can handle. The PFRA.030.2 is a specially designed polymeric positive temperature coefficient (PPTC) device that comes with several useful features. These features include its instantaneous built in response time, its high interrupting capacity, and its ability to self-reset in the case of a short circuit. These features combine to combat over-current conditions and ensure the safety of the circuit as well as efficient longevity of the electronic device.

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