TRF250-120US-2 Circuit Protection

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:	2s
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:	Tape & Reel (TR)

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PTC Resettable Fuses are widely used in electronic circuits that require effective protection against over current, over voltage, and short circuits. They offer a cost-effective and reliable alternative over traditional thermal fuses or polyfuse. The TRF250-120US-2 is a type of resettable fuse engineered by American manufacturer Bourns Inc. The TRF250 fuse is offered in a common cylindrical package with a diameter of 2 millimeters. It features an enhanced surge rating of 350mA, an operating temperature range from -40C to 85C, and an operating voltage of 120V. A distinguishing feature is the PTC “positive temperature coefficient” technology enabled in the fuse. This memory-free device requires no energy for its operation, and it eliminates the need for an external control system. The application of the TRF250-120US-2 can primarily be seen in consumer electronic appliances and industrial control devices. Its primary purpose in such applications is to protect electronics against short-circuit and overvoltage conditions. This resettable fuse has an auto-protection characteristic that helps to avoid overheating of the circuit. When it trips due to a surge or overload, the circuit automatically resets itself after a certain amount of time or when the current increases below the trip threshold.The working principle of the PTC Resettable Fuse is based on the complex behavior of the metallic film inside the fuse. When the current passes through the device, it produces heat which reduces the resistance of the metallic film. If the current passes this resistance value, it gets to a state called “trip” and the protected system is then disconnected from the power supply. Conversely, when the current decreases below a certain point, the PTC resumes its normal mode and the circuit is re-connected.One of the main advantages of using PTC fuses is the resettable feature. This eliminates the need for manual replacement of traditional thermally fused components, saving time and costs related to replacements. In demanding applications, the PTC fuse is an ideal choice because it helps to improve the reliability of the protected system by providing fast and safe operation. Not only is the TRF250 fuse suitable for secure operation against short circuits and overvoltage conditions, but its extensive line of sizes and ratings provides flexibility for designers to select an appropriate fuse for their application. It also offers a wide voltage range and temperature stability that surpasses that of a traditional fuse. In summary, the TRF250-120US-2 is a reliable resettable fuse manufactured by Bourns Inc. It is designed with an enhanced surge rating, a low tripping temperature, and a wide voltage range for consumer and industrial electronic applications. Its PTC “positive temperature coefficient” technology and auto-protection feature helps to protect against short-circuit and overvoltage conditions, increasing the reliability and safety of the circuits. Moreover, its resettable feature helps eliminate the need for manual replacement.

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