The BOURNS part PWR221T-30-4R00F is a resistor that is designed for automotive applications. It is a thick film resistor with a resistance value of 4 Ohm and a tolerance of 1%. The power rating of this resistor is 2.25/30W, meaning it can handle high power loads without overheating. It has a temperature coefficient of ±100ppm/°C, ensuring accurate and stable resistance values over a wide range of temperatures. Encased in a TO-220 package, this resistor is easy to mount and install. It is also epoxy sealed, providing added protection against moisture and other environmental factors. This resistor is supplied in a tube packaging, making it convenient for bulk ordering and storage.