The AHX668 is a dust-tight protective cover designed for rectangular head pushbuttons and selector switches in the Fuji Electric Command Switch series. It provides protection against dust accumulation and accidental operation in industrial control applications. The cover has dimensions of 24 × 30 × 14.2 mm and is compatible with AH164 and AH165 series illuminated pushbuttons and selector switches. It is applicable for panel thicknesses up to 2.0 mm maximum. This accessory is commonly used in machine tools, industrial machines, control panels, and distribution panels where environmental protection and operational safety are critical requirements.