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I believe "commutateur" is used for a light switch. When is "interrupteur" used for "switch?" thank you.
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*Technically* speaking:
An interrupteur is a simple "on-off" switch.
A commutateur is a "logical" switch, selecting between different circuits/paths in a circuit.
So technically, most light switches are probably "interrupteurs". It wouldn't surprise me to find that in informal non-technical use the two are often confused.
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