MF-RHT550-AP

PTC resettable fuses are an important form of circuit protection and are favored by many electronic application engineers. This article will focus on the applications and working principles of the MF-RHT550-AP PTC resettable fuse.

Applications of MF-RHT550-AP PTC Resettable Fuse

The MF-RHT550-AP is a radial leaded thermally-protected, polymeric Positive Temperature Coefficient (PTC) resettable fuse. It is suitable for a wide range of applications including, but not limited to, low-voltage electronic devices, slim power supplies, inverters, PC boards, testing equipment, no-fuse breakers, DC UPSs, Telecommunication equipment, Home automation, Industrial and automotive systems, and power adapters. It provides superior protection against over-current and over-temperature risks in a tiny, surface-mount package.

The MF-RHT550-AP can support high surge current of up to 100A and operates at temperatures ranging from -55 to +105°C. It features low internal resistance, fast self-recovery time, and a wide voltage range from 5-415VAC. Thanks to its unique heat dissipating structure, the MF-RHT550-AP provides superior over-current and over-temperature protection for large and intensive loads, making it an ideal choice for applications requiring a reliable, low-cost, and long-lasting solution.

Working Principle of MF-RHT550-AP PTC Resettable Fuse

The MF-RHT550-AP PTC resettable fuse is a bimetal fusible element encapsulated in special thermoplastic material. Under normal conditions, the device operates as a low-resistance switch, allowing current to flow from input to the output. When the circuit experiences a fault, the bimetal will conduct the excessive current to the ground, thus protecting the circuit against damage. This process, known as tripping, causes the bimetal to heat up and expand. This expansion will open up the device and will break the current flow.

When the over-current or over-temperature condition is eliminated, the device will cool down and reset, allowing for current to flow again. The resetting process is done manually, by pressing down on the reset button found on the device. Once the button is pressed, power is restored to the circuit and the device is ready to trip again if needed.

The MF-RHT550-AP PTC resettable fuse is an effective solution for over-current and over-temperature protection of electronic circuits. It features a low self-resistance, wide operating temperatures, and a compact size, making it an ideal choice for many applications. With its reliable protection and fast reset time, the MF-RHT550-AP PTC resettable fuse is an excellent choice for applications requiring robust protection.