The AQY414EHAX is a normally closed (1 Form B) PhotoMOS relay in a surface-mount package, designed for controlling AC or DC loads. It is rated for a load voltage of 400V and a continuous load current of 120mA, with a typical on-resistance of 26Ω. This device features reinforced insulation, providing an I/O isolation voltage of 5,000V AC. Common applications include power supplies, measuring equipment, security systems, and other industrial plant equipment.