Extron RSB 123 (part number 60-604-21) — the gray powder coat 1U, 3.5-inch deep Basic Rack Shelf.

This is the current-production colour of Extron's shallowest basic shelf. One rack unit high and 3.5 inches deep, it gives four quarter-rack-width Extron products, or eight eighth-rack-width products, a shared home in a 19-inch rack. Each device is fixed to the shelf from below with two of the supplied screws, then the whole assembly screws into the rack rails. It is the no-frills sibling of the RSF 123 kit: same shelf, without the three blanking plates. If the finished front needs to be solid, pair it with RFF Series faceplates in the matching widths.

Key Capabilities

• 1U shelf, 1.73 inches high, 19 inches wide across the rack ears
• 3.5-inch (8.9 cm) depth for shallow Extron enclosures
• Holds four quarter-rack or eight eighth-rack width products
• Underside mounting with the screws supplied in the box
• Gray powder coat, matching Extron rack equipment
• Optional RFF Series faceplates cover unused shelf positions

Where It Is Used

Standard fare in shallow AV racks: classroom and lecture-theatre cabinets, meeting-room credenzas, lectern and podium racks, digital signage players, and small control-room bays where a handful of quarter-width interfaces need to occupy a single tidy rack unit.

Specifications at a Glance

• Model: Extron RSB 123, part number 60-604-21
• Rack height: 1U, 1.73 in (4.4 cm)
• Width: 19 in (48.25 cm) with rack ears, 17.5 in (44.5 cm) usable
• Depth: 3.5 in (8.9 cm)
• Finish: gray powder coat; false faceplates not included

Also referenced as Extron RSB123, RSB-123, part number 6060421.