TCF250-120T-B-0.5

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PTC resettable fuses, or polymer positive temperature coefficient (PPTC) fuses, are self-resetting current limiting devices. When a fault current is detected, the device deforms and opens up an electrical circuit, protecting the circuit from dangerous or damaging currents. The TCF250-120T-B-0.5 is a PTC resettable fuse specifically designed for 12V DC operation in automotive applications.

Application Field

PTC Resettable Fuses like the TCF250-120T-B-0.5 can be used in a wide variety of DC applications including lighting systems, automotive, telecom, appliances, audio/video systems, and consumer electronics. Automotive applications in particular are the realm of the TCF250-120T-B-0.5 due to its 12V operation and 0.5 A maximum current rating. In automotive systems, the TCF250-120T-B-0.5 helps protect DC circuits from damaging currents while seeing to total system reset capability in the event of a short-circuit event.

Working Principle

The TCF250-120T-B-0.5 works on the principle of a PPTC fuse, featuring both electrical and thermal resistance. The device features a PPTC element which changes resistance rapidly when the fault currents exceed the trip current of the device. This opens the circuit, and causes an internal fuse element to open causing the device to remain open until manually re-set. When the current in the circuit returns to normal, the PPTC element returns to a low-resistance state, and the fuse reset button can be used to restore the circuit to working order.

The TCF250-120T-B-0.5 is a hermetic sealed device constructed of epoxy-encapsulated electronics with an integral snap-on mounting tab. It features a maximum hold current of 0.5A, and a minimum trip current of 2.5A. The device\'s maximum operating voltage is 18VDC, and the ambient temperature range for the TCF250-120T-B-0.5 is -40°C to +85°C. The device is also UL registered and CSA accepted, making it an ideal choice for automotive applications.

The TCF250-120T-B-0.5 is a high-performance, cost-effective, and reliable PTC Resettable Fuse suitable for use in a variety of applications. Utilizing the principles of PPTC electronics, the fuse enables circuit designers to ensure maximum safety and protection in automotive, telecom, lighting, appliance, and consumer electronics systems.

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