What it is and what it fits
The SENTRON 3VA9588-0VK20 is a rear interlock mounting plate accessory for 3VA15/25 1000 frames.
Deployment context
Mounts behind the breaker in a panel or enclosure, providing the mechanical interlock interface so that two breakers cannot be closed simultaneously — common on generator-transfer or dual-feed switchgear where backfeed protection is required.