TRF250-120T

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PTC Resettable Fuses, or polymeric positive temperature coefficient (PPTC) fuses, are a special type of over-current circuit protection device. Unlike traditional fuse elements which need to be replaced once burnt out, PTC devices can automatically reset themselves after an over-current is detected. The TRF250-120T is a popular PTC resettable fuse device available from Littelfuse with a number of customized features and applications.

The TRF250-120T is suitable for a wide range of applications, including providing overload protection, reverse polarity protection, and short-circuit protection for delicate electronic components. With its low operating temperature (65°C) and low resistance (0.7Ω), it is ideally suited for use with a variety of sensitive electronic equipments such as medical equipment, cooling fans, and LCD flat-panel displays.

The working principle behind the TRF250-120T is relatively simple. When the device is exposed to an unexpected or dangerous current, the temperature of the PTC element inside the device rises sharply, causing a sudden increase in its resistance. This sudden increase in resistance effectively cuts off the current, effectively preventing any damage to the sensitive components it is supposed to protect.

When the device has cooled down, the element will reset itself to its initial state. This type of device is known as an On/Off Circuit. The main advantage of this type of circuit is that it is not affected by momentary power overloads, so it is perfect for protecting sensitive electronic components that require long-term protection. Additionally, the On/Off Circuit also provides thermal protection, ensuring that the components it is protecting do not overheat and are kept within nominal operating temperatures.

The TRF250-120T also has two additional features which are highly useful. The first is its low capacitance design, which minimizes system noise and interference. The second is its low self-inductance, which ensures the device can accurately sense changes in current levels. Combined, these features make the TRF250-120T ideal for applications where fast, accurate response to changes in current levels is critical.

Overall, the TRF250-120T is one of the most reliable and trusted resettable fuse devices available on the market today. Its low temperature operation, low resistance inductance, and highly sensitive sensing capabilities make it ideal for protecting sensitive electronic components from dangerous over-current events and thermal damage. With its wide range of applications, the TRF250-120T provides effective short-circuit, reverse polarity, and overload protection, ensuring that sensitive electronic components can operate safely and reliably for many years.

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