0ZRM0375FF1A

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PTC Resettable Fuses

A PTC resettable fuse, also known as a resettable polyfuse, is a type of polymeric positive temperature coefficient (PPTC) fuse, which is used for circuit protection. It is designed to provide over-current protection to electronic circuits, by disconnecting the circuit when the current exceeds a predetermined value. Unlike a regular fuse which must be replaced after each overload, a PTC resettable fuse will automatically reset itself once the circuit is no longer overloaded. The PTC Resettable Fuse, with reference code 0ZRM0375FF1A, is an example of such a device.

Application Field

PTC Resettable Fuses are ideal for applications where over-current protection is required, such as access control, security, power supplies, healthcare, medical, automotive, industrial, lighting, consumer electronics, appliance, and many more. Their resettable feature makes them especially helpful when the same electrical circuit will be repeatedly subject to the same overload scenarios.

Working Principle

A PTC Resettable Fuse, such as the 0ZRM0375FF1A, works by triggering a reset switch when the current exceeds a particular set point. As the current passes through the fuse, its resistance also rises with the temperature increasing, as a result of joule heating. This resistance increase causes the current to drop, limiting the amount of current passing through the circuit. When the temperature drops to a certain level, the resistance decreases, allowing the current to flow through the fuse again. Additionally, the PTC Resettable Fuse features an extrudable body element which provides additional current limiting during a fault.

Advantages

PTC Resettable Fuses offer several advantages over regular fuses. Due to their self-resetting feature, these devices save time and money associated with replacing the fuse each time an overload occurs. Additionally, they are more reliable than regular fuses, as they can respond faster to fault conditions. Furthermore, PTC Resettable Fuses are also compact and can be used in tight spaces, allowing for miniaturization of electronics, and therefore lower system cost.

Conclusion

PTC Resettable Fuses, such as the 0ZRM0375FF1A, are a great option for applications where over-current protection is needed. They offer reliability, reset speed, low cost, and miniaturization benefits. For more information on the device, please consult the manufacturer’s datasheet or contact their technical support.

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