B-Line Eaton series Type 3/3R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$909.20
B-Line Eaton series Type 3/3R junction boxes, 18" height, 6" length, 12" width, 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door

B-Line Eaton series Type 3/3R junction boxes, 18" height, 6" length, 12" width, 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door

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Model: 18126 RTHC
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$909.20
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Eaton B-Line series Type 3/3R junction boxes, 18" height, 6" length, 12" width, NEMA 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door, 5 knockouts, Embossed thru holes, Carbon steel

Manufacturer Resources

Product Specs

Certifications:
UL 50
Closure Type:
Formed top hinge
Country Of Origin:
United States
Cover Type:
Hinged
Finish Color:
Painted
Locking Provisions:
Padlock provision
Mounting Hole Details:
Embossed thru holes
Mounting Method:
Surface
Nema Rating:
3R
Product Height:
18 in
Product Length Depth:
6 in
Product Weight:
13.6 lb
Product Width:
12 in
Special Features:
Rain hood, removable cover
Wall Thickness:
16 gauge
Department:
Electrical
Product Model:
RTHC enclosure
Product Color:
ANSI 61 Grey
Product Style:
Medium single door
Product Material:
Carbon steel

B-LINE 18126 RTHC – Frequently Asked Questions

1) Can the B-Line 18126 RTHC junction box be mounted outdoors?
Yes. The 18126 RTHC enclosure carries a NEMA 3R rating and includes a rain hood, so it is built for outdoor, rain-exposed locations. NEMA 3R protects against falling rain, sleet and external ice formation; it is not a washdown or hosedown rating. The carbon steel body is painted ANSI 61 grey.
2) What are the actual box dimensions of the B-Line 18126 RTHC enclosure?
It measures 18 inches high, 12 inches wide and 6 inches deep, which is where the 18126 designation comes from. At 6 inches of depth you have room for terminal blocks, small contactors or wire splicing, but check your bend radius before committing to it for large-conductor pull points. Shipping weight is 13.6 lb.
3) How does the cover open on the 18126 RTHC, and can it be locked?
It is a hinged cover on a formed top hinge, single medium door style, and the cover is removable if you need the box clear for wiring or painting. There is a padlock provision on the door, so you can secure it with your own padlock; no lock is supplied.
4) Is the B-Line 18126 RTHC UL listed for my facility spec?
The enclosure is built to UL 50, the standard for enclosures for electrical equipment, and the NEMA type is 3R. If your drawing calls for a 3R painted steel screw-cover type box, note this one is a hinged-cover design instead, which is usually accepted and is easier to service on a wall.
5) Does this B-Line enclosure come with knockouts already punched, or do I have to drill it?
The 18126 RTHC ships with 5 knockouts, so common conduit entries are already provided. Any additional entries you punch yourself in a 3R enclosure should be made with rated hubs or fittings to keep the rain-tight integrity of the box.
6) How is this junction box fastened to a wall, and are mounting holes provided?
Surface mount, with embossed thru holes in the back of the enclosure for fasteners. Anchors and screws are not part of the box, so pick hardware for your substrate (masonry anchors for block, lags for stud or strut). At 16 gauge carbon steel and 13.6 lb, two-point anchoring into solid backing is enough for most installs.
7) What is the exact part number to order this 18 x 12 x 6 B-Line 3R hinged enclosure?
Order it as Eaton B-Line 18126 RTHC. The RTHC designation is the hinged-cover, rain-hood enclosure type in the series, and the box is made in the US.
8) Will the painted finish on this B-Line enclosure match the other gear on my site?
The 18126 RTHC is painted ANSI 61 grey, the standard light grey used across most industrial control gear and panelboards, so it lines up visually with existing B-Line and Eaton enclosures on the same wall.
How fast can I get the B-LINE 18126 RTHC 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 18126 RTHC come with a warranty?
Absolutely. The B-LINE 18126 RTHC 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 18126 RTHC?
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 18126 RTHC 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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