MF-R135-0-99

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PTC Resettable Fuses offer an alternative to traditional fuses for many applications. One of the best-known brand names in this category of product is MF-R135-0-99. In this article, the application field and working principle of the MF-R135-0-99 fuse will be discussed.

Application Field

MF-R135-0-99 fuses provide short-circuit protection with a fast-acting fuse characteristic. They are designed for use in power circuits where current surges and/or short-circuits can occur. The fuse will react to the surges within microseconds and thereby protect the connected circuit from damage due to these inrush currents. Typical applications include use in power supplies, electronic devices, medical equipment, and other consumer products.

Working Principle

The MF-R135-0-99 fuse works by employing a Polymeric Positive Temperature Coefficient (PPTC) element. This PPTC element consists of an amorphous, electrically highly resistive material embedded in a bonding matrix, which is further encapsulated in the plastic shell of the fuse. The device shall not be activated on normal over-loads, but shall be designed to respond to specific over-currents or short-circuits.

When the fuse is placed in a circuit with a current flowing through it, the PPTC element’s resistance increases with rising temperature. When a specified over-current is detected, the PPTC material rapidly heats up, initiating a change in the device’s electrical contact resistance and, consequently, a variation in the total resistance. This triggers a circuit protection action, and the PPTC material quickly self-limits the current flow, acting as a fuse.

The device is reset by either unplugging it from the power supply and/or allowing it to cool down. Once it has been reset, it can be plugged back into the circuit and will function normally without having to be replaced. This is what makes PTC fuses a reliable and cost-effective solution for short-circuit protection.

Conclusion

The MF-R135-0-99 PTC resettable fuse is a reliable and effective means of providing short-circuit protection in a number of different applications. With its fast-acting fuse characteristic, it can respond quickly to inrush currents and other short-circuit scenarios and protect the connected device or circuit from damage. Furthermore, it can be reset and reused multiple times, thereby providing a cost-effective solution for short-circuit protection.

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