That said, this document describes the HE-Y7 as an 800Vdc relay, while the HE-Y5, HE-Y6 are described as 277Vac, so check if this is important. I cannot locate a data sheet on the web.

It includes galvanic isolation of 3.6mm minimum “furthermore, the high dielectric strength protects against surge voltages,” said the firm. “This fact combined with rapid opening of the contacts makes it possible to reliably handle DC loads as well.”

Breakdown is here described as 2kVrms between open contacts and 5kVrms contacts to coil, with 10kVrms surge withstanding.

Coil power is 2.5W, with variants at 6, 9, 12 or 24Vdc.

It comes with UL,  VDE and CSA approvals.

Application is expected in battery chargers, frequency inverters and solar inverters.