H277 transformer steps 277V line voltage down to 120V fixture operating voltage. 300VA max. For use with Non-IC housings. H277 TO 120V TRANSFORMER
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https://static.graybarcanada.com/Generic/synd_cooperlighting/pdf/documents/848820b69adc83326efa3a5e9d8abfc5fb4fb868.pdf
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Primary Spec Sheet
https://static.graybarcanada.com/Generic/synd_cooperlighting/pdf/documents/848820b69adc83326efa3a5e9d8abfc5fb4fb868.pdf