The AF43SD is a panel board front trim — the hinged cover that closes the front of a Size A enclosure, measuring 43-1/2" x 20". Surface mounting means it bolts directly to the enclosure frame, not flush-recessed into a wall cavity — standard for industrial panel boards where the back box is surface-mounted and the trim closes the front.
Deployment context
This trim goes on a Size A panel board enclosure — the 43-1/2" x 20" footprint tells you the rough opening it covers. Front-hinged design means the trim swings open for breaker access without removing it entirely, which saves time during commissioning and troubleshooting.