The ZB5AW085 is a 22 mm light module assembly from the Schneider Electric XB5 range — the illuminated indicator component that sits behind a pushbutton or pilot light operator in a control station. It accepts a BA 9s bulb and is supplied via a transformer at either 440 V AC or 480 V AC. Mounts in the standard 22 mm panel cutout (0.9 in) and integrates with the XB5 contact block and fixing collar to form a complete illuminated pushbutton assembly.
The BA 9s bulb base is a standard miniature bayonet fitting — common for indicator lamps in industrial control stations. The 440/480 V AC supply via transformer means this module is designed for line-voltage indication on 400 V class systems, not for low-voltage 24 V control circuits. The silver alloy contacts (Ag/Ni) handle the 10 A rated current for the lamp circuit, with A600/Q600 contact designation covering pilot-duty and relay-duty switching.