ASMD250F-2 Circuit Protection

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PTC Resettable Fuses

PTC Resettable Fuses, also known as Polymeric Positive Temperature Coefficient (PPTC) Fuses or Multi-layer Polymer Fuses, are a type of current-limiting device. They are built with a combination of a thermistor and a fuse, which ensures their ability to automatically reset after a current overload or voltage surge. The ASMD250F-2 is a type of PTC Resettable Fuse with a reputable reputation, making it an ideal choice for many applications.

ASMD250F-2 Application Field

The ASMD250F-2, as previously stated, is an ideal choice for many applications. Its wide application field covers computer motherboards, such as desktop, Laptop, and servers, as well as secondary power supplies, adapters, battery chargers, e-gaming machines, etc. Furthermore, ASMD250F-2 can also be used in medical and industrial applications for hot-swappable and critical connections.

ASMD250F-2 Working Principle

The working principle of the ASMD250F-2 is that it is constantly monitoring the current, and will automatically open the circuit if the current exceeds its rated current. When the current is removed,the PTC immediately resets and the circuit is re-closed.

The PTC Resettable Fuse consists of three main components: a stator, a PTC thermistor, and a fuse element. The stator, which is the core part of the ASMD250F-2, is composed of two separate layers. The outer layer is made of a high temperature resistant insulation material, and contains the resin-molded PTC thermistor and the fuse element. The inner layer is composed of high temperature resistant copper tape, which is connected to the thermistor and the fuse element, creating a complete circuit.

The PTC thermistor is the key component of the ASMD250F-2. It normally has high impedance in low ambient temperature and a low resistance when the temperature rises. When the ambient temperature increases, it enables the current to flow through the circuit, which is known as the “On-State.”

When the ambient temperature and therefore the thermistor further increase, the resistance increases and blocks the current flowing through the circuit, which is known as the “Off-State,” or “ Thermal Trip,” and disconnects the circuit.

As a result, the failure of the circuit can be avoided by applying the PTC thermistor of the ASMD250F-2. The PTC thermistor is able to repeat the ON-OFF-ON cycle according to the corresponding temperature; therefore, the ASMD250F-2 can protect the circuit accurately and reliably in the long-term.

Conclusion

In conclusion, the ASMD250F-2 is a highly reliable PTC Resettable Fuse, capable of protecting the circuit against overload or voltage surge. It is applicable for a wide range of applications due to its ability to automatically reset after a thermal trip, making it an ideal choice for multiple applications.

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