PFRX.135.2 Circuit Protection

Resistance - Initial (Ri) (Min):	120 mOhms
Approvals:	CSA, TUV, UR
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.772" (19.60mm)
Size / Dimension:	0.571" Dia x 0.122" W (14.50mm x 3.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	300 mOhms
Series:	PFRX
Time to Trip:	9.6s
Current - Trip (It):	2.7A
Current - Hold (Ih) (Max):	1.35A
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC resettable fuses are a type of bimetallic fuse designed to protect electronic circuits from overcurrent. They are often used in place of a conventional fuse, where the fuse must repeatedly reset, or when a circuit needs to be placed in a sealed area, where the fuse cannot be easily replaced. PTC resettable fuses are available in many different shapes and sizes, to fit most any circuit.The PFRX.135.2 is a radial leaded PTC Resettable Fuse designed specifically for high power applications. This fuse has a rated operating current of 45 Amps, and is designed to trigger at a much higher current rating (~6 times the rated operating current). This makes it ideal for protecting power supplies and other high-current applications.The PFRX.135.2 features a dual thermal protection system, with a two-zone PTC track and a thermal switch fuse wire that is triggered when the PTC track reaches its maximum temperature rating. This ensures that the fuse will trip and reset even if the current load increases suddenly, avoiding catastrophic failures.The fuse also features a novel design which allows the PTC track to be isolated from the circuit substrate. This prevents heat-induced deformation of the fuse track, which can lead to false triggering. Additionally, the surface-mount design allows it to be placed in tight locations where space is at a premium.The PTC resettable fuse works by using a PTC track that is thermally sensitive. When the circuit current exceeds the designed operating current, the PTC track heats up and begins to increase its resistance. When the resistance of the PTC track reaches a certain level, then it will successfully trip and disconnect the circuit from the power supply.Once the current load has dropped, the heat generated by the PTC track dissipates, resetting the fuse and allowing current to flow through the circuit once more. This whole process can occur in just a few milliseconds, allowing the fuse to trip and reset in a very short time.In summary, the PFRX.135.2 is a high-power PTC Resettable Fuse that is designed specifically for use in high-current applications. It features a dual-zone PTC track and a thermal switch fuse wire that is triggered when the PTC track reaches its maximum temperature rating. Additionally, its surface-mount design allows it to be placed in tight locations, while the PTC track is isolated from the circuit substrate to prevent heat-induced deformation of the fuse track. Finally, the fuse can trip and reset in just a few milliseconds, providing very fast response times.

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