YQD120N0045

PTC Resettable Fuses are a type of self-resetting fuse that can be used for circuit protection in a wide range of applications. The YQD120N0045 is one such fuse, and its application field and working principle are explained below.

Application Field

The YQD120N0045 PTC Resettable Fuse has a wide range of potential applications, including protection in digital systems, information processing systems, communication equipment, power supplies, consumer electronics, and other infrequent over-current protection applications. The fuse is ideal for equipment and systems that require resettable protection.

Working Principle

The YQD120N0045 PTC Resettable Fuse works by detecting when the current flow exceeds the fuse\'s rated current and then automatically cycling the current off until the cause of the over-current condition has been addressed. This process is known as "fusing" and helps to protect sensitive components. The fuse works by using two elements (Polymeric Positive Temperature Coefficient and Fusible Element) made from different materials that react differently when the current exceeds the fuse\'s rating.

The Polymeric Positive Temperature Coefficient (PPTC) element detects when the current increases beyond the preset level and begins to heat up. This action triggers the PPTC element to become an "open" conductor, thus cutting off the current flow. The Fusible Element is designed to melt when the PPTC element triggers, breaking the circuit.

Once the cause of the over-current condition has been addressed, the fuse can be reset by pressing a small reset button, which allows the current to flow again. The reset button can also be used to test the fuse before use.

The YQD120N0045 PTC Resettable Fuse offers advantages over traditional fuses in terms of resetting, size, and cost savings. It requires minimal maintenance, can be reused multiple times, and provides reliable protection against over-currents. The fuse is also relatively inexpensive compared to other types of resettable fuses.

In summary, the YQD120N0045 PTC Resettable Fuse is a reliable and cost-effective way to protect circuits from over-currents. Its wide range of applications, easy testing and resetting, and small size make it an ideal choice for many circuits.