RB2BW07 is a  Through Resistor, 240 VAC,  illuminated body assembly for Push Buttons or Selector Switches, serving as the housing and light unit. Supplied with BA9s 130V filament bulb, without any Contact blocks, so they can be added based on the desired circuit function. An optional Globe LED can be purchased separately.

“Through resistor” means the illumination is powered through a built-in resistor that reduces the voltage to a level suitable for the LED/lamp.