YQS8121

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PTC Resettable Fuses are available for various types of applications, ranging from small consumer electronics to industrial applications. The YQS8121 is a type of PTC Resettable Fuses, which uses a non-linear positive temperature coefficient (NTC) thermistor to provide protection against overloads and short circuits.

The typical application fields for this YQS8121 are industrial, automotive, communication, and consumer electronics. Industrial and automotive applications of this fuse are used in applications that require over-current protection such as batteries, power supplies, inverters, electronic and process control systems, and motor controllers. In communication applications, this fuse provides protection for data networks, telecommunication systems and modems. In consumer electronics such as audio/visual equipment, GPSs, and mobile phones, the YQS8121 is used to protect against excessive current.

The YQS8121 Resettable Fuse works by relying on the NTC thermistor within it to provide protection against current overloads. This NTC thermistor works by having a non-linear resistance-temperature curve, where the resistance increases very quickly when the ambient temperature changes in a short time. In this way, the thermistor acts as a sensitive current detection element, which can monitor the current in an application. When the current in an application is higher than the rated value, the thermistor will heat up accordingly due to the increased resistance.

When the current exceeds the rated current value, the heat generated by the thermistor causes it to open the circuit, so that all current is disconnected from the application. The fuse then switches back to its normal state after the over-current condition is resolved, completing the resetting process. This process is repeated each time an over-current occurs.

The YQS8121 Resettable Fuse provides protection against most over-current situations by the simple, yet effective, resetting process. It is a cost-effective solution for applications that require reliable over-current protection, such as power supplies, motors, and electronic control systems. Its ability to reset and remain functional even after multiple events makes it an ideal choice for these applications.

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