The 554-0001-100 is a panel-mount indicator light designed for use with the 554 Series solid-state Hall effect switches operating in the momentary action mode at 4.5 VDC to 16 VDC. This indicator accepts all standard cap sizes and is constructed with 94V-0 plastic components for durability and safety compliance. The unit features a T-1 3/4 midget incandescent lamp base and is designed for snap-in bezel mounting on standard panel cutouts. The indicator integrates seamlessly with the 554 Series switch family, providing visual feedback in industrial control and instrumentation applications where reliable status indication is required.