The XS3F-M421-402-R is a part of the Omron XS3 Series of power supply modules. It is an AC-DC power supply module, providing a 24V/21A output with a universal AC input of 85-264VAC. The module provides a wide operating temperature range of -20°C to 70°C and is designed to be highly efficient, offering low harmonic distortion and noise. It also features overvoltage, overcurrent, and over-temperature protection, as well as a 3-in-1 active power factor correction. The module is also RoHS compliant and has a compact size for easy installation.