The 4SH422A is an AC-operated industrial relay from Fuji Electric's "Orange Line" SH Series, featuring a 4-pole configuration with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts. The relay provides high contact reliability with bifurcated contacts that accommodate electronic devices, supporting a minimum operational voltage and current of 5V and 3mA DC for direct input to electronic control circuits. It is designed for 1,800 operating cycles per hour with a mechanical life of 10 million operations and electrical life ratings of 500,000 operations at AC11 (220V and 440V) and 500,000 operations at DC11/14 (24V–220V). The relay conforms to international standards including IEC, NEMA, BS, and VDE, with UL, CSA, BV, and Lloyd approvals, and mounts directly on standard 35mm IEC or DIN rails. Its expandable design allows installation of optional auxiliary contact blocks, coil surge suppression units, and terminal covers for field flexibility, making it suitable for industrial automation, electronic control systems, and applications requiring reliable switching with high contact integrity.