RUSB090

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PTC resettable fuses are a type of electrical safety device integrated into circuits. RUSB090 is one of these devices and has a variety of applications and working principles to suit the needs of a range of applications. This article considers the application field and working principles of the RUSB090.

Application Field

RUSB090 PTC resettable fuses provide reliable over-current protection for various types of electrical circuits, including power supplies, lighting systems, telecommunications equipment, automotive systems, medical devices, consumer electronics, computers and many more. With a range of options available, the fuse can be customized to fit with the design and application requirements of a circuit. This includes options for operating voltage, operating temperature, number of over-current cycles, reset time and current ratings.

Working Principle

RUSB090 PTC resettable fuses operate using a special type of thermistor called a positive temperature coefficient (PTC) device. A PTC device is an electrical component that has a property of increasing its internal resistance with temperature. When the current flowing through the PTC device exceeds its rated maximum value, the PTC device heats up and the increased temperature causes its resistance to rise rapidly, reducing the amount of current allowed to pass through it. The temperature of the PTC device is then dissipated via the built-in thermal safety element which, combined with the increase in resistance, act to reduce and limit the amount of current flowing through the fuse.

When the temperature of the fuse has gone down and reached a safe level, the device will reset itself, returning to its normal operating status and allowing the current to flow through it again. This is an important safety feature as it ensures that the fuse can be reset without causing any damage.

Conclusion

RUSB090 PTC resettable fuses are an important device for providing over-current protection in a variety of applications. It is able to detect excessive current flowing through a circuit and then limit the current to a safe level. In addition to this, the device is able to reset itself and and return to its normal operating status. With this range of applications and working principles, the RUSB090 is a reliable device to protect against unexpected currents and ensure the safety of users.

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