PFST.120

Resistance - Initial (Ri) (Min):	85 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	--
Thickness (Max):	0.039" (1.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.827" L x 0.199" W (21.00mm x 5.05mm)
Package / Case:	Strap
Mounting Type:	User Defined
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	220 mOhms
Series:	PFST
Time to Trip:	5s
Current - Trip (It):	2.7A
Current - Hold (Ih) (Max):	1.2A
Current - Max:	100A
Voltage - Max:	15V
Type:	Polymeric
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses: PFST.120 Application Field and Working Principle

PTC resettable fuses, also called polyfuses, are self-actuating devices that serve to protect electrical circuits from overcurrents. The acronym PTC stands for Positive Temperature Coefficient and refers to the behavior of semiconductors that are part of the fuse design. PTC resettable fuses offer a unique electrical feature that allows the circuit to reset itself after a thermal overload event.PFST.120 is a range of PTC resettable fuse products created by Littelfuse, a leading global manufacturer of automotive, industrial, and consumer electronic solutions. The PFST.120 PTC fuse utilizes a patented design to provide superior overcurrent protection to a range of different applications. This includes solar power systems, battery powered LED lighting, power amplifiers, and other power electronics. It is available in a variety of current ratings, from 0.75A to 15A.The PFST.120 consists of two parts: an active part and a passive part. The active part is the body of the fuse which houses the semiconductor components. The passive part consists of a protective sleeve and auxiliary leads. All parts are encapsulated in a standard thermoplastic housing.When an overcurrent event occurs, the PTC resettable fuse is designed to detect the temperature rise and quickly actuate. In doing so, it opens the circuit, thus protecting the connected device from further damage. This is the key role of PFST.120 and other PTC resettable fuses. Once the thermal overload event is over, the device will reset itself, continuing with regular operations.The key features of PFST.120 make it an attractive solution for a wide range of applications. These features include: fast response time, high temperature resistance, robust construction, RoHS, reversal protection, and low inserted losses. The product is very easy to install and provides good conformance with UL, IEC, and CSA standards. It is also suitable for both indoor and outdoor use.In summary, the PFST.120 PTC resettable fuse provides reliable protection to a variety of electrical systems, including those exposed to harsh environments. It offers a superior range of features over conventional fuses and can reset itself quickly after a thermal overload event, saving time and cost. With a growing focus on environmental responsibility, PTC resettable fuses provide an excellent solution for eco-friendly designs.

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