B59873C0120A051

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PTC Resettable Fuses: B59873C0120A051 Application Field and Working Principle

Polymeric Positive Temperature Coefficient (PPTC) resettable fuses represent a modern device used to detect and prevent damages caused by short circuits and overcurrent. The B59873C0120A051 is a PPTC resettable fuse that can detect currents up to 20A, with a maximum voltage of 250V AC.

PPTC resettable fuses have many advantages over the traditional fuse technology. They are designed to detect low-level currents for a preset period and reset automatically, without the need to replace or reset the fuse. This prevents them from becoming a bottleneck in the device since it can be placed in a variety of locations. Furthermore, they are highly configurable and relatively small in size, making them useful for a variety of applications.

Nowadays, the B59873C0120A051 PPTC resettable fuse is widely used in power supplies, charging systems, audio and video systems, and other industrial applications. The maximum current it can detect is 20A and the maximum voltage is 250V AC. It can also carry between 10A and 20A with an operating temperature of between -40°C and 85°C, which is a good range to cover most applications.

Given its low resistance, this type of device is suitable for low current applications, while having the unique ability to reset itself if the current exceeds the rated levels. This ensures protection and prevents the device from entering a catastrophic failure.

When it comes to the working principle of the B59873C0120A051 PPTC resettable fuse, we start by saying that it is based on the so called “Multilayer” technology. This means that the modern devices are composed of two layers of a polymeric material, one of which is a positively temperature-coefficient value and the other is a self-normalizing layer.

When an over-current occurs, the positively temperature-coefficient sublayer heats up and its electrical resistivity increases by a factor of hundred or more, effectively forcing the current to reduce and prevent electrical damage to the device. This properties allows the PPTC circuits to remain open during a fault.

The “Multilayer” technology also ensures that when the fault is cleared, the PPTC circuit will automatically reset itself. This is due to the self-normalizing sublayer, which slowly cools by itself, thereby resetting the overcurrent values back to their initial state.

In conclusion, the B59873C0120A051 PPTC resettable fuse is an excellent device for detecting and preventing damages caused by short circuits and overcurrent. Its high configurability and low size makes it a ideal choice for various application fields, such as power supplies, charging systems, audio and video systems, and other industrial applications. Thanks to its “Multilayer” technology, this fuse automatically detects and resets the values wire exceeding the rated levels.

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