TRF250-120UST-B-0.5

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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Introduction to PTC Resettable Fuses

PTC or Positive Temperature Coefficient resettable fuses are a specialized type of fuse that offers overcurrent protection of electrical and electronic circuits. They are popular in applications where other types of fuses may be too large, too expensive or too unreliable. PTC fuses are commonly used in consumer electronics, medical equipment, lighting, and automotive systems, among other applications.

TRF250-120UST-B-0.5 Application Field and Working Principle

The TRF250-120UST-B-0.5 is a PTC Resettable Fuse designed for an operating range of 0.07 to 6A and a voltage rating of 120VAC. This PTC Resettable fuse is widely used in consumer electronics, medical equipment, lighting and automotive systems.The working principle of a TRF250-120UST-B-0.5 is that when an overcurrent passes through the fuse contact, the fuse will detect the overcurrent and will begin to heat. This heat causes the PTC material to swell, which breaks the electrical connection and shuts off the current to the circuit. When the current is removed, the PTC material cools back down and the connection is restored and the circuit can be reset.

Advantages of PTC Resettable Fuses

PTC Resettable Fuses offer a number of advantages over traditional fuses. The key advantages of PTC Resettable Fuses are as follows:

• PTC resettable fuses are less expensive than traditional fuses.
• Through their thermal action, PTC resettable fuses offer superior circuit protection and more reliable operation.
• PTC resettable fuses are more reliable since they are not prone to fail due to vibration or other conditions.
• PTC resettable fuses are easy to install and require no maintenance.
• PTC resettable fuses can be reset after an overcurrent has occurred and the circuit has been shut off.

Disadvantages of PTC Resettable Fuses

As with any technology, there are some drawbacks to consider when looking at PTC Resettable Fuses, such as:

• PTC resettable fuses are limited in their ability to protect against high-energy transients.
• PTC resettable fuses have a finite lifespan and must be replaced after a certain number of operations.
• PTC resettable fuses can be more expensive than traditional fuses and require additional circuitry for electronic resetting.
• PTC resettable fuses are limited to a narrow temperature range for optimal operation.

Conclusion

PTC Resettable Fuses offer superior circuit protection and reliable operation in many different applications. The TRF250-120UST-B-0.5 in particular is widely used in consumer electronics, medical equipment, lighting and automotive systems. PTC Resettable Fuses offer many advantages such as cost savings over traditional fuses, superior circuit protection, and easy installation. However, there are also some drawbacks to consider such as limited protection against high-energy transients, finite lifespan, higher cost, and limited temperature range. It is important to consider these pros and cons before making a decision about which type of fuse is best for your application.

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