RHEF070U-2

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The RHEF070U-2 is a type of PTC resettable fuse. It is primarily designed as a protector for electrical circuits against short-circuits and overloads. It operates by breaking the circuit when it detects a current that exceeds the rated value, making it an effective tool to ensure the safety of electrical installations and devices.

The RHEF070U-2 features a soldered-in connection, a 2.7 mm x 27.4 mm body and a wide operating temperature range of -40 degree Celsius to +125 degree Celsius. It also has a high current-limiting characteristic, with a time-delay before disconnection of up to 300 ms. The rated voltage of the PTC resettable fuse is 60 volts and the maximum rated current is 7 amps.

The working principle of the RHEF070U-2 is based on a thermally-sensitive polymeric positive temperature coefficient (PPTC) device, which consists of a series of conductive material elements embedded in an insulating matrix. This device undergoes a temperature-dependent change in its electrical characteristics, from low-resistance to high-resistance, when it is exposed to excessive electrical current. The device detects and disconnects the circuit much faster than regular fuses, especially when overcurrent is detected. Further, as soon as the current is reduced, the device will reset itself, allowing the circuit to be restored to its original state.

The RHEF070U-2 is widely used in applications such as computer motherboard circuits, home appliances, telecommunication systems, industrial control systems, automotive and aerospace systems, etc. It helps protect these sensitive components and systems from excessive current, which may arise due to variations in power supply voltage, short-circuits, sudden surges, etc. The device is also useful in operations involving high currents, where if overcurrent passes through a fuse, it may be too late for the system to recover even when the fuse is removed.

To summarize, the RHEF070U-2 is a PTC resettable fuse designed to serve as an effective protective device for electrical circuits against short-circuits and overloads. It operates based on a thermally-sensitive PPTC device, which changes its electrical characteristics when the current exceeds the rated value. The device is suitable for a wide range of applications, such as computer motherboards, home appliances, telecommunication systems, etc. It help protect the users from overcurrent and other related hazards, ensuring that the circuits remain safe and stable.

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