AR30S2R-20B is a pushbutton switch with selector ring designed for 2-position operation and momentary action type. It features a 2NO (two normally open) contact arrangement with a black button color and is equipped with a 40mm diameter operator with selector ring. The switch provides NO (normally open) contact operation and is constructed with oil-and dust-proof operator module design conforming to IEC Standard IP65, ensuring reliable performance in dusty and moist environments. This component is commonly used in industrial control applications where compact, reliable switching with quick-replacement contact blocks is required.