Is this a single pole switch? Or a timer switch that is rated for 277V? Or a dimmer switch?
Please include brand and model number and what you are controlling when adding comment to this thread.
277Volt has one hot wire and one neutral wire, exactly like 120volt.
Just like ordinary on-off switch for 120v, the 277 Volt hot wire is switched on-off, while the neutral remains continuous throughout the circuit.
http://waterheatertimer.org/How-to-wire-switches.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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