PFSM.050.2 Circuit Protection

Resistance - Initial (Ri) (Min):	350 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.125" (3.18mm)
Height - Seated (Max):	--
Size / Dimension:	0.289" L x 0.214" W (7.36mm x 5.44mm)
Package / Case:	2-SMD
Mounting Type:	Surface Mount
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	1.4 Ohms
Series:	PFSM
Time to Trip:	4s
Current - Trip (It):	1A
Current - Hold (Ih) (Max):	500mA
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses

PTC resettable fuses are a type of electrical protection device which are used to protect electrical components from overcurrent. PTC resettable fuses are typically used in applications where failure is not an option, such as medical equipment, automotive systems, computers, and consumer electronics.The PTC resettable fuse is composed of a Polymer Positive Temperature Coefficient (PPTC) element, which is a temperature-sensitive material. The PPTC element is wrapped around a thin metallic conductor. When the PPTC element is exposed to a current above its rated value, it generates heat due to the Joule effect, which causes the material to expand and increase its resistance. This increase in resistance causes the current through the fuse to be limited, protecting the circuit from overcurrent.

PFSM.050.2 Application Field and Working Principle

The PFSM.050.2 is a PTC resettable fuse designed for use in consumer electronics, medical, automotive, and other industrial applications. It is designed to protect against overload and overcurrent conditions, and is equipped with a manual reset button.The PFSM.050.2 is composed of a PPTC material which is formed into a flat disc-shaped element with a small wire running through the center. The PPTC element is enclosed within a cylindrical heat-shrinkable protective cover.The PFSM.050.2 operates by limiting the current through the fuse when it detects an overload or overcurrent condition. When the current reaches the rated value, the PPTC element will generate heat due to the Joule effect and expand, increasing its resistance and limiting the current. This protection circuit will remain in effect until the current is reduced or the manual reset button is pressed, at which point the fuse will reset.The PFSM.050.2 is designed to be used in applications where failure is not an option. It is rated for the following operating temperatures: -40°C to 85°C (temporary up to 125°C). It is designed for use in a variety of current ranges, from 0.023A to 15A, at a rated voltage of 240VAC.The PFSM.050.2 is a compact, cost-effective, and reliable way to protect against overload conditions and provide protection for electrical components in a variety of applications.

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