MF-RX185-AP

PTC resettable fuses are widely used for protecting electronic components from overcurrent and electrical short circuits. They have a number of advantages over traditional fuses, such as automatically resetting after an overcurrent event, and reducing the cost of replacing fuses. Among the various resettable fuses, the MF-RX185-AP is one of the most popular. It is used in a wide range of applications, including power supplies, cell phones, and home and automotive electronics.

The MF-RX185-AP is a ceramic positive temperature coefficient (PTC) resettable fuse. It is designed to protect the circuit from overcurrent in applications with a current up to 5A. It features a reset voltage of 125VAC or 250VDC, a hold voltage of around 135VAC and a trip current of around 6A. It also has a wide operating temperature range of -55°C to 105°C.

The MF-RX185-AP PTC resettable fuse is made up of several components. The most important component is the ceramic PTC element, which is surrounded by an epoxy casing. Inside the element is a resistor path that changes its electrical resistance when the element reaches a certain temperature. As soon as the current in the protected circuit exceeds the rated maximum, the resistance increases, and the current is reduced. It is then slowly decreased back to the rated current level.

The MF-RX185-AP PTC resettable fuse can be used in a variety of applications, including circuit boards, communications systems, power supplies, automotive electronics, and consumer electronics. In circuit boards, its overcurrent protection capabilities make it a great choice for protecting sensitive components from current spikes, while in communications systems, it can provide continuous resistance over long periods of time.

The working principle of the MF-RX185-AP PTC resettable fuse is simple. When current in the protected circuit exceeds the rated maximum, the ceramic PTC element heats up and its resistance increases, reducing the current. Once the current is reduced to normal levels, the element cools down and resumes its original resistance. The trip current of the element is determined by its rating – the higher the current rating, the higher the trip current.

In summary, the MF-RX185-AP is one of the most popular PTC resettable fuses. It is typically used in applications where it needs to provide fast, reliable protection from overcurrent, such as in circuit boards, communications systems, power supplies, automotive electronics, and consumer electronics. It is made up of several components, with the most important being a ceramic PTC element, which increases its electrical resistance when the element reaches a certain temperature. The working principle of the element is simple – once the current exceeds the rated maximum, the element heats up and its resistance increases, reducing the current.