How to Wire an Illuminated Rocker Switch
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The divider on the terminal block is a dead give away-same row is the switched terminal while opposite row is the return terminal for the light. Most AC rocker-switch uses neon lamps, while DC rockers uses incandescent or LED which the switched side is usually the positive/anode.
There ought to be markings on the side like voltage and current limits (including the specs of the bulb inside)... or even the full schematic of the switch.