TRF250-120UA

Resistance - Initial (Ri) (Min):	6 Ohms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.197" (5.00mm)
Thickness (Max):	--
Height - Seated (Max):	0.394" (10.00mm)
Size / Dimension:	0.236" L x 0.150" W (6.00mm x 3.80mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	16 Ohms
Series:	PolySwitch®, TRF250
Time to Trip:	1s
Current - Trip (It):	240mA
Current - Hold (Ih) (Max):	120mA
Current - Max:	3A
Voltage - Max:	60V (250V Int)
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses: TRF250-120UA Application Field and Working Principle

PTC Resettable Fuses are a form of electrical protection that interrupts a circuit upon detecting an over current condition and can reset itself without any human intervention. TRF250-120UA is one of the most popular and widely used PTC resettable fuses, usually applied in the following fields：

Home Appliances and Electronics

The TRF250-120UA can be used in all types of home appliances, such as air conditioners, washing machines, refrigerators and other electronic products. It starts up quickly, disconnects the over-current, and restarts automatically after the over-current is eliminated. Besides, TRF250-120UA can also play a role in preventing fire caused by short circuit.

Medical Equipment

Medical equipment is often used in all kinds of emergencies to ensure the personal safety of medical personnel. TRF250-120UA can provide reliable over-current protection in medical devices, ensuring the safety of people, and it boasts lower operating temperature and low resistance, which is a very important feature in medical applications.

Automotive

In cars, TRF250-120UA is mainly used for on-board charging, such as providing protection on car battery terminals. It can effectively isolate the battery after detecting the over-charging and prevent the burning of battery terminals, and reset itself when the fault is removed.

Working Principle

The working principle of TRF250-120UA is based on the fact that its internal parts can heat up under electrical current. When the current reaches a certain point, it will cause the part to heat up. This heat causes the PTC Resettable Fuses to become very resistant, thus blocking the circuit and preventing any further electrical current from flowing through it. When the current is stopped, the part will cool down and the resistance will go back to its original low value, allowing the circuit to be reset and normal current to be restored.

Conclusion

TRF250-120UA is a popular and widely used PTC resettable fuse. It is usually used in home appliances, medical devices and automotive applications for over-current protection as well as over-charging protection. It is able to reset itself when the fault is removed. The working principle is based on the heating up of an internal part when a certain level of current is reached.

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