The HEL-14D271K is an axial leaded varistor manufactured by Hongzhi. It is a 210-Ohm metal oxide varistor with a maximum rated power of 4.2W, and its voltage rating is 225V to 455V AC. It is a 4.5KA-rated through-hole device and is compliant with RoHS directives. This device provides protection against voltage transients such as those caused by lightning and power line switching. It helps to reduce noise on AC systems and can be used in a variety of applications including automotive, surge protection, power conditioning, and more.