Siemens 52PA4G9 is a transformer-type, oil-tight pilot light for 120 V AC control circuits, featuring an amber lens (G9) and the rugged Class 52 heavy-duty form factor. Inside, it uses an internal transformer to drive an incandescent lamp and is designed for 50/60 Hz operation in industrial panels and equipment where oil-tight sealing and durable construction are required. This amber-lens variant, part number 52PA4G9, is specified for 120 V AC indicator-light applications in demanding environments such as control cabinets and machinery panels that must resist oil exposure.
