TRF250-180-2 Circuit Protection

Resistance - Initial (Ri) (Min):	800 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.197" (5.00mm)
Thickness (Max):	--
Height - Seated (Max):	0.472" (12.00mm)
Size / Dimension:	0.354" Dia x 0.150" W (9.00mm x 3.80mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	4 Ohms
Series:	PolySwitch®, TRF250
Time to Trip:	2s
Current - Trip (It):	650mA
Current - Hold (Ih) (Max):	180mA
Current - Max:	10A
Voltage - Max:	100V (250V Int)
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable FusesPTC resettable fuses are safety fuses designed to protect circuits against overload, short-circuits and heat dissipation. Their basic feature is that they feature a self-resetting fuse, a Polymeric Positive Temperature Coefficient (PPTC) device that’s a combination of two elements - a polymer and a solid-state metal oxide pellet - that work in tandem to suppress current over a pre-set threshold. This threshold is determined by the particular characteristics of the PPTC device used, and is tailored to the safety requirements of the particular application. When the current flowing through the fuse exceeds the set threshold, the PPTC element reacts by increasing its resistance to an extent that shuts down the circuit completely. When the circuit is shut down, the PTC has effectively reset itself and can be used again - far superior to traditional fuses, which must be replaced when they blow.TRF250-180-2 is a PTC resettable fuse belonging to the TRF250 series, with a rated current of 180mA and rated voltage of 250V. Suitable for a range of applications, the TRF250 series features a UL94V-0 nylon housing, RoHS compliant construction, and is CSA, UL, and VDE approved. TRF250 fuses are generally employed in applications where impacts to sensitive electronic components need to be minimized.When it comes to the working principle of TRF250-180-2, the specific details may vary a bit from fuses of other series, but generally speaking, the principles are largely the same. When the current through the fuse exceeds the pre-set threshold, the PTC element reacts by increasing its resistance and triggering a shut-down of the circuit. The PTC element then cools down, effectively resetting the fuse, and becomes useful again.The working principle of PTC resettable fuses is especially beneficial when the overload would be too large for the traditional fuse to handle without breaking, or when the appliance needs to be protected from short-circuiting. The resettable feature additionally makes them incredibly reliable for regular applications, as the user will not need to replace a regular fuse every time it breaks due to an overload.The applications field for PTC resettable fuses, like the TRF250 series, is widely varied. Generally, they are used in a range of commercial, industrial, and consumer electronics, such as medical devices, DC/PC, networking, communication, instrumentation, and software applications. As previously mentioned, they are also widely used in applications that require greater protection from environmental and mechanical impacts, as well as thermal or mechanical short-circuit scenarios.A short-circuit is a situation when the flow of electron discharge exceeds the pre-set value, resulting in too much current going through the circuit and causing the risk of an electrical fire. PTC resettable fuses offer a reset mechanism, thereby allowing the user to replace the fuse after a short-circuit or overload has been identified and sufficiently cooled down. This ensures a safe environment with minimal interruption of power flow during dangerous scenarios, protecting both the user and the equipment from the risk of fire or explosion.Finally, in terms of use, TRF250-180-2 and other resettable fuses should be installed following the guidelines set by the manufacturer. This usually involves the use of an appropriate fuse holder, the right crimping tool for the application, the correct cable and preventive measures against ambient temperature extremes. Following these steps is paramount for ensuring the safety and reliability of the system.In summary, PTC resettable fuses like TRF250-180-2 deliver an automatic reset capability in short-circuit or overload scenarios, thus minimizing downtime and ensuring a safe environment for the users. The wide applications field offered by these fuses, together with their UL, CSA, and VDE approvals, makes them suitable for a large range of scenarios, including those where impacts to sensitive components must be kept to a minimum. When choosing a CTC resettable fuse, it is important to follow the manufacturer’s guidelines to ensure the correct fit for the application in question, as well as maximum safety.

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