B-Line Eaton series Type 3/3R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$599.03
B-Line Eaton series Type 3/3R junction boxes, 12" height, 8" length, 12" width, 3R, Screw cover, RTSC NK enclosure, Surface mounted, Small single doo

B-Line Eaton series Type 3/3R junction boxes, 12" height, 8" length, 12" width, 3R, Screw cover, RTSC NK enclosure, Surface mounted, Small single doo

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Model: 12128 RTSC NK
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$599.03
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Eaton B-Line series Type 3/3R junction boxes, 12" height, 8" length, 12" width, NEMA 3R, Screw cover, RTSC NK enclosure, Surface mounted, Small single door, No knockout, Embossed thru holes, Carbon steel

Manufacturer Resources

Product Specs

Certifications:
UL 50
Closure Type:
Flanged cover
Country Of Origin:
United States
Cover Type:
Screw
Finish Color:
Painted
Mounting Hole Details:
Embossed thru holes
Mounting Method:
Surface
Nema Rating:
3R
Product Height:
12 in
Product Length Depth:
8 in
Product Weight:
11.5 lb
Product Width:
12 in
Special Features:
Rain hood, plated screws
Wall Thickness:
16 gauge
Department:
Electrical
Product Model:
RTSC NK enclosure
Product Color:
ANSI 61 Grey
Product Style:
Small single door
Product Material:
Carbon steel

B-LINE 12128 RTSC NK – Frequently Asked Questions

1) Can the Eaton B-Line 12128 RTSC NK junction box be mounted outdoors?
Yes. The 12128 RTSC NK is a NEMA 3R enclosure, which covers outdoor use against falling rain, sleet and external ice formation. It ships with a rain hood and plated screws for that service, and it is UL 50 listed. It is not a washdown or hosedown rating, so for direct spray or heavy dust you want a Type 4 or 4X box instead.
2) What are the actual box dimensions on the B-Line 12128 RTSC NK?
12 inches high, 12 inches wide and 8 inches deep. The model number reads the same way: 12 x 12 x 8. Allow extra clearance above the box for the rain hood and enough room in front to pull the screw cover straight off.
3) Does this B-Line enclosure come with knockouts for conduit?
No. The NK in 12128 RTSC NK means no knockouts, so every conduit entry gets punched or hole-sawed in the field. That is the point of the NK version: you place the holes where your runs actually land. If you want factory conduit openings, order the knockout version of the RTSC instead.
4) How does the 12128 RTSC NK box fasten to a wall?
Surface mount, using embossed thru holes in the back of the enclosure. The embossed holes keep the fastener standoff off the mounting surface so water does not track in at the screw. Mounting fasteners are not part of the box, so pick anchors to suit the wall, and plan for 11.5 pounds of empty enclosure plus whatever you put in it.
5) Is the cover hinged or does it come off completely?
It is a screw cover, flanged, held by plated screws. It lifts off completely rather than swinging on a hinge, so you need free space in front of the box to remove and set it aside. For an opening you will be into regularly, a hinged-door enclosure is the easier choice; the screw cover suits pull boxes and terminations you rarely revisit.
6) What gauge steel is the B-Line RTSC junction box, and will it hold up outside?
Carbon steel at 16 gauge, painted ANSI 61 grey. That is the standard grey used across industrial gear, so it matches typical panelboards and control cabinets on the same wall. Painted carbon steel is right for normal outdoor and industrial exposure; for coastal salt air or chemical exposure, specify stainless or a 4X polycarbonate box.
7) I need to match an existing enclosure on site. What exact part number is this?
Eaton B-Line part number 12128 RTSC NK, made in the US. The designation breaks down as 12 x 12 x 8 inches, RTSC for the rainproof screw cover style, NK for no knockouts. Quote all of it when matching a fleet of boxes, because the same size exists with knockouts and that version is a different part.
8) Is the B-Line 12128 RTSC NK a single door enclosure?
It is a small single door style with one screw-on cover over the full 12 by 12 inch face. One opening, one cover, nothing to latch or lock as supplied.
How fast can I get the B-LINE 12128 RTSC NK delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the B-LINE 12128 RTSC NK come with a warranty?
Absolutely. The B-LINE 12128 RTSC NK is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the B-LINE 12128 RTSC NK?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the B-LINE 12128 RTSC NK from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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