The 1489MP4 is the smallest enclosure in the 1489 ordering table: an 8.25 in x 7.25 in box with four 22.5 mm pushbutton holes, sized for a small local control point such as start, stop and a pilot light or two. It is a Type 12 mild steel pushbutton enclosure from the 1489 Series, designed to accept standard heavy duty oil tight pushbuttons, switches and pilot lights, and it provides protection from dirt, dust, oil and water.

The enclosure measures 8.25 in (210 mm) high, 7.25 in (184 mm) wide and 6.00 in (152 mm) deep, and the part drawing gives a usable depth of 6.16 in, a door width of 7.59 in and a 0.89 in diameter for each of the 4 pushbutton holes. A removable 14 gauge inner panel of 6.25 in (159 mm) x 5.25 in (133 mm) is included and mounts on the weldnuts provided. Shipping weight is 9 lbs (4.08 kg).

Construction is formed 16 gauge steel with smooth, continuously welded seams and welded brackets for mounting the enclosure. The continuously hinged cover is secured with captive, plated steel screws that fasten into threaded sealed wells, with an oil resistant gasket and adhesive. A bonding stud is provided on the door and a grounding stud in the enclosure. Cover and enclosure are phosphatized and finished in ANSI 61 gray powder coating; the inner panel is finished in white powder coating.

The 1489MP4 is rated UL 508A Type 12 and CSA Type 12 and complies with NEMA Type 12 and IEC 60529, IP54; appropriate components are required to maintain these standards. The same enclosure size with 30.5 mm holes is part number 1489P4.