This relay shows the AMERICAN ZETTLER / MCE name, and you can tell it is from a steady brand.
Minilec d1vcr2 Under/Over Voltage Relay d1 vcr2
What stands out about this piece is that its model, A110-30-11-84, is stamped right on the side.
You will find that the override switch is snug on the unit, so it does not snag on cables.