AH165-2SELG11E3 is an oil-tight illuminated pushbutton switch manufactured by Fuji Electric, designed for industrial control applications requiring reliable operation in harsh environments. The switch features an extended square head operator with a flat LED lamp rated at 24V DC, providing clear visual feedback during operation. It is configured with 1NO+1NC (one normally open and one normally closed) contact arrangement, enabling flexible control logic in machine tools, industrial machines, and control panels. The AH165-2 series offers oil-tight sealing (IP65 rating) for enhanced durability in contaminated environments, with momentary action operation suitable for standard pushbutton control applications. This switch is commonly used in distribution panels and instrumentation panels where reliable switching and visual indication are essential for operator safety and system monitoring.