YM120D170N250

PTC resettable fuses have become increasingly commonplace in modern circuit protection, and the YM 120D170N250 is a great example of a standard resettable fuse. This model fuse is commonly found in air conditioning equipment, home and vehicle electronics, agricultural equipment, and other medium-duty applications.

YM 120D170N250 fuses incorporate a positive temperature coefficient (PTC) thermistor to protect circuits. This thermistor works by increasing its resistance to the flow of current as its temperature rises. That means that if the current gets to a pre-set limit, the temperature of the fuse will rise, thus limiting the current it can pass, and in turn protecting the circuit from damage. This limit is known as the "hold current" for the fuse.

The YM 120D170N250 is designed for a hold current of 200A and a tripping current of 250A. This means that if the current passing through the circuit rises above 250A, the fuse will trip and the circuit protected. This makes it ideal for medium-duty applications as it allows greater current than some other models, while still protecting the circuit from overload.

Once the current is reduced to below 200A, the fuse will reset itself and start working again. This resetting process is made possible by a series of metal plates placed inside the PTC thermistor. As the current passes through the thermistor, it causes a thermal shock which causes the metal plates to expand and contract. This repositioning of the plates changes the characteristics of the thermistor, allowing current to pass through it again.

YM 120D170N250 PTC resettable fuses offer a cost effective, reliable and versatile solution for medium-duty circuit protection. In addition to air conditioning equipment, home and vehicle electronics, and agricultural equipment, these fuses are suitable for applications such as general purpose motor circuits and small industrial equipment. Their versatility, combined with their ability to reset after being tripped, make them a popular choice for many applications.