TRF250-120-B-0.5

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PTC Resettable Fuses are a form of resettable fuse which are based on the use of a polymer PTC (positive temperature coefficient) material, also known as a PolySwitch, which is used to provide current limiting protection against overload or short circuit. The TRF250-120-B-0.5 is the most commonly used resettable fuse, and is suitable for a wide range of applications.

The TRF250-120-B-0.5 is a miniature PTC Resettable Fuse rated at 250 Volts and designed to limit a maximum of 120 Amps of current at 0.5 seconds. It is designed to be used in applications requiring current limiting protection, and can be used in a variety of circuits, from low voltage power supplies to high voltage automotive and industrial applications. When used in low voltage circuits, the TRF250-120-B-0.5 can be used in parallel with a breaker or other protection device to provide a double protection against short circuit or overload.

The working principle of the TRF250-120-B-0.5 is based on a PTC (Positive Temperature Coefficient) polymer material which act as an insulator when cold and a conductor when hot. When the fuse is connected to a circuit, it will begin to heat up due to the flow of current passing through it. As the temperature rises, the PTC material will start to swell and become a conductor, causing the current through the fuse to decrease. The current limiting protection provided by the TRF250-120-B-0.5 will trip the circuit once the current flow is reduced to a point where the circuit will not be damaged.

Once the current has been restricted, the fuse will automatically reset itself and resume its normal function. The PTC material inside the TRF250-120-B-0.5 will cool down, shrinking and becoming an insulator once again. This makes the TRF250-120-B-0.5 an ideal choice for applications requiring repeatable and reliable current protection with quick response time.

The TRF250-120-B-0.5 can be used in a variety of applications, from low voltage power supplies to high voltage automotive and industrial circuits. It can be used in series with primary protection devices such as fuses and circuit breakers to provide additional current limiting protection. It can also be used in critical applications to protect sensitive components from sudden current surges.

In summary, the TRF250-120-B-0.5 is an ideal choice for applications requiring reliable current protection with quick response time. It is a miniature PTC Resettable Fuse rated at 250 Volts and designed to limit a maximum of 120 Amps of current at 0.5 seconds. The working principle is based on a PTC (Positive Temperature Coefficient) polymer material which act as an insulator when cold and a conductor when hot, resulting in automatic current limiting and resetting of the device in the event of an overload or short circuit.

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