::Retort: I agree that it is probably the most common use in real life (what with the relative popularity of lights over railroads and the OSI model), but that shouldn't mean that it should have the convenience monopoly on what is, to be fair, a very vague term! If the disambig is not changed itself to obscure the part which reads "A switch is an electrical component which can break an electrical circuit, interrupting the current or diverting it from one conductor to another. Switch may also mean...", it means that people looking for one of the other 36 forms of switches would be less inconvenienced - which they are, seriously or not - and people actually loking for electrical switches can see their goal at the top of the disambiguation.