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PTC Resettable Fuses

PTC resettable fuses are self-resetting circuit protection devices used in higher power applications that are not typically available in transistor or diode form factors. The OZRB0090FF1C is a PTC resettable fuse that offers enhanced protection from excessive current by using a polymeric temperature-sensitive element that opens during a current over-load event. After the element is reset, the circuit current will be held to the rated current value, provided the fault has been cleared.

Application Field

The OZRB0090FF1C is used in high power industrial, automotive, and consumer applications where excessive currents can cause thermal damage and possibly offset plant safety. In most cases, applications that require this type of protection are found in consumer devices like intelligent power supplies, battery packs, notebook computers, medical systems, and industrial control systems. It can also be used in automotive applications where it can help protect low-side current sensing circuits.

Working Principle

The OZRB0090FF1C works on the principle of a temperature-sensitive element that opens during a current overload event, reducing the circuit current to its rated current value. The element then resets and holds the circuit current again at its rated current value, provided the fault has been cleared. The device is rated up to 90A and has a maximum voltage rating of 100Vdc. The operating temperature range is -40°C to +85°C.

The OZRB0090FF1C is designed to protect circuits by providing fast response to over-current conditions and by accurately controlling the current flowing through it. When the current exceeds the rated maximum current, the element heats and melts a fusible link connecting two terminals of the device. This opens the circuit and reduces the current to its rated value. After cooling of the fusible link, the device returns to its original state. This limits the damage caused by the over-current.

Conclusion

The OZRB0090FF1C offers industrial, automotive, and consumer applications a reliable solution for protection from over-currents. Its temperature-sensitive element ensures fast response and accurate control of the current passing through the circuit, and its resetting capability allows for repetitive protection operations during overload events. With its wide temperature range and high maximum voltage rating, it is suitable for use in various applications.

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