The kit allows to install the UPS EF9012 into Edge-core ECS4120-28F and use the DC power input connector to connect an external battery.

As a result of modernization, we get a switch with a built-in UPS and backup power by one external lead-acid battery 12 V with capacity from 7 Ah to 60 Ah.

The UPS is installing instead of the original power supply. The size and mounting holes to match.