B-Line Eaton series imperial cable tray and ladder, 4" Height, 9.78" Length, 30" Width, 30" and 24" Tray widths, Series 2-5 straight reducer, Aluminum

The Eaton B-Line 4A-30-SR24 is a Series 2-5 straight reducer that transitions a run between 30 inch and 24 inch tray widths without offsetting the run centerline. Rail height stays 4 inches through the transition and the reducer itself adds 9.78 inches of length to the run. Use it where a tray run steps down in width but the cables need to continue on the same straight path.

The fitting is built to a 24 inch radius, so cables routed through it are not forced tighter than that as the tray narrows from 30 to 24 inches. That matters on large power and control cable where the manufacturer's minimum bending radius governs the layout. Check your largest cable's minimum bend radius against the 24 inch figure before you set the run.

This reducer is aluminum, which is the usual pick where weight on the supports matters or where the environment would attack painted steel. The fitting weighs 3.3 pounds, so a single installer can hold it in place while bolting up. Steel tray fittings are the alternative where you need higher load capacity or where the specification calls for a hot dip galvanized finish. Match the fitting material to the tray you are splicing into, since mixing aluminum and steel in a run creates dissimilar metal contact at the splice.

The 4A-30-SR24 is supplied as the reducer fitting itself. Splice plates and the bolt and nut sets that connect it to the adjoining 30 inch and 24 inch tray sections are ordered separately, so count two splice connections per reducer when you build the material list. Supports on either side of the transition are also a separate line item.

Order Eaton B-Line part number 4A-30-SR24. The number reads as 4 inch rail height, 30 inch nominal width, straight reducer to 24 inch, in aluminum. Quote that number to match an existing run rather than describing it by dimensions, since B-Line builds reducers in the same widths at other rail heights.

The reducer is CE marked. That is the only marking carried on the record for this fitting, so if your specification calls for a particular NEMA tray class or a listed grounding path, confirm that against the tray series documentation for your project.