0ZRB0400FF2B

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A PTC Resettable Fuse (PRF) is an over-current protection device for electronic circuits. Unlike a conventional fuse, it can be used repeatedly without the need for replacement after each protection event. The 0ZRB0400FF2B datasheet is a commonly used type of PRF.

The 0ZRB0400FF2B has a wide variety of applications including preventing thermal runaway in audio amplifiers, protecting USB ports from over-current and powering low voltage fans. It has a broad temperature range of -55℃ to +125℃ and a resistance range of 0.003 ohms to 500 ohms. It is UL Recognized and CSA Certified, making it a reliable and consistently performing device.

The 0ZRB0400FF2B contains two metal plates, usually made of nickel, silver or copper, within an insulating housing. The two plates and the insulator are electrically separated, but when the current reaches the fuse’s cutoff point, the plates become connected and electrical current freely flows through the circuit. This causes the plates to heat up, which in turn increases the resistance of the connection. This causes the current to reduce until it drops to a safe level and the fuse is restored to its original state.

The 0ZRB0400FF2B’s working principle involves combining a thermistor with a simple high-strength mechanical reset switch. The thermistor is typically composed of a metal alloy and an insulating ceramic. When the current exceeds the thermistor’s cutoff point, the metal alloy expands, causing a direct decrease in resistance. This increases the temperature of the ceramic and eventually trips the mechanical reset switch, allowing the circuit to be safely reset.

The 0ZRB0400FF2B is a versatile PTC resettable fuse with a range of applications, suitable for either high or low voltage applications. Its simple working principle of combining a thermistor and a reset switch allows a reliable and consistent performance and makes it a popularly used over-current protection device.

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