B-Line Eaton series imperial cable tray and ladder, 6" Height, 27" Length, 24" Width, 24" and 12" Tray widths, Series 2-5 horizontal reducing tee, Alu

It's a horizontal tee fitting that branches a run of cable tray and reduces at the same time: the main run is 24 inch tray width and the branch comes off at 12 inch tray width. Rail height is 6 inches, so it mates to 6 inch deep tray of the same series. Overall it measures 27 inches in the length direction and 24 inches in width, with a 12 inch radius through the turn.

The radius sets the minimum bend the conductors take as they turn into the branch. This tee turns on a 12 inch radius, so cables whose manufacturer-specified minimum bending radius is 12 inches or less can make the turn without being over-bent. If you are pulling large power cable with a bigger minimum bend radius, you need a larger radius fitting instead.

Aluminum. That keeps the fitting light for overhead work (it weighs 17.92 lb) and is the usual choice where the tray run is aluminum already. Mixing aluminum fittings into a steel tray run is not good practice, so match the material through the run.

The 6A-24-12-HT12 does both jobs in one piece: it branches the run and steps the branch from 24 inch tray down to 12 inch tray at the same point. Using a full-width tee and then a reducer adds a second fitting, two more splice joints, and roughly another foot of run length. Use the separate approach only when the reduction has to happen somewhere other than at the tee itself.

Horizontal only. It's a horizontal reducing tee, meaning the branch comes off in the same plane as the main run, flat. For a change of elevation you need a vertical elbow or a vertical tee, not this fitting.

The catalogue number is 6A-24-12-HT12. That reads out as the Series 2-5 aluminum horizontal tee, 6 inch rail, 24 inch main run reducing to a 12 inch branch, 12 inch radius.

The 6A-24-12-HT12 is CE marked. That is the only marking carried in its spec record, so if your job requires a specific listing beyond CE, verify against the manufacturer's submittal for the series.

It's 17.92 lb of aluminum on its own, before any cable fill, and spans 27 inches through the fitting with a 24 inch face. Standard practice is a hanger on each side of the fitting rather than trying to cantilever it off the adjoining straight sections, since the branch leg adds load off the centerline.