ABB OVZA-20-1 Relay

The OVZA-20-1 Relay from ASEA BROWN BOVERI (the lineage that became ABB) is a historical industrial relay documented with a 500 V rating and the UNMP designation in product listings. This exact model appears in secondary marketplaces and catalogs under the OVZA-20-1 name, reflecting its place in ASEA BROWN BOVERI’s control-relay lineup. Typical use for relays of this type is to serve as a compact control and protection device within electrical panels and switchgear, providing switching and signaling functions in legacy automation equipment. The pairing of the OVZA-20-1 designation with a 500 V rating is how buyers identify compatibility with older installations that require this specific ABB/ASEA BROWN BOVERI relay family. As a product of the ABB/ASEA BROWN BOVERI heritage, the OVZA-20-1 embodies the era’s approach to robust, discrete-control relays designed for industrial environments, where reliability in panel-based control circuits was essential. If you’re restoring or spares-curating legacy equipment, matching the OVZA-20-1 model and the listed voltage ensures you’re selecting the intended device from the historical OVZA family.