MF-RHT500-0

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PTC Resettable Fuses

PTC Resettable Fuses, sometimes known as "Positive Temperature Coefficient" fuses, are fuses designed to provide circuit protection and reset themselves, much like the traditional thermostat fuses. PTC fuses consist of a thermally sensitive polymer element surrounded by a metal body and two contacts at either end. When the short circuit current passes through the element, it heats up until the resistance reaches a set level. This causes the fuse to stop passing current and trip. After a cooldown period, the resistance resets, and the fuse is once again allowing current.

PTC Resettable Fuses have a wide range of applications, mainly in over-current protection, and are often used in many consumer electronics, including computers, cell phones, and other portable electronic devices. They have also been utilized in the medical device industry and serve as primary protection for lighting fixtures and smoking machines.

Among these resettable fuses, the MF-RHT500-0 is a self-resetting thermal cut-off device with a one time overload protection of the PC board. It helps prevent any overcurrent situation, and thus protects the connected circuits. The MF-RHT500-0 is characterized by their high sensitivity, fast response time and high overload capability.

The working principle of the MF-RHT500-0 is relatively simple. It is composed of a flexible PTC thermistor, a metal body and two metal terminals. The thermistor is a bi-metallic PTC resistor in a circuit. When a high current passes through the thermistor, the temperature rises and the PTC element increases the resistance of the circuit. This reduces the current flowing through the thermistor, protecting the connected devices from overload. When the current and temperature drop, the resistance of the PTC element decrease, allowing the current to flow back through.

The MF-RHT500-0 is well suited for over-current protection in home and industrial electrical systems. Given its over-current protection capability, it also serves as an alternative for applications in which a general-purpose fuse or regular thermal cut-off may be used.

On the other hand, the MF-RHT500-0 is also suitable for use in higher temperature applications, as it has a rated temperature use up to 135℃. This feature allows it to be widely used in applications which require higher temperature ranges.

Overall, the MF-RHT500-0 self-resetting thermal cut-off offers a reliable and time-saving solution for over-current protection. With its high sensitivity, fast response time and high overload capability, it can serve as an effective alternative for applications in which regular thermal cut-off may be used.

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