These are high quality 24V Magnecraft SPST relays rated for 15A at 120VAC or 12A at 240/277VAC.
Carrier Corp. Att'n: Mike Bellomo 516 W. 34th St. New York, NY 10001
Here are two 277 volt test controls. The internal transformer is a 240 volt unit. It works well. Runs cool, et.. I should be getting some 277 volt transformer samples in soon. It shouldn't make any difference in the operation, but we have to get ETL to pass the unit. Read more ...