B-Line Eaton series Type 3/3R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$615.74

B-Line Eaton series Type 3/3R junction boxes, 12" height, 4" length, 12" width, 3R, Hinged cover, RTHC enclosure, Surface mounted, Small single door,

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Model: 12124 RTHC
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$615.74
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Eaton B-Line series Type 3/3R junction boxes, 12" height, 4" length, 12" width, NEMA 3R, Hinged cover, RTHC enclosure, Surface mounted, Small 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:
12 in
Product Length Depth:
4 in
Product Weight:
8.4 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:
Small single door
Product Material:
Carbon steel

B-LINE 12124 RTHC – Frequently Asked Questions

1) Can the B-Line 12124 RTHC junction box be mounted outdoors?
Yes. The 12124 RTHC carries a NEMA 3R rating and includes a rain hood, so it is built for outdoor wall mounting where falling rain, sleet and ice are the concern. NEMA 3R is not a washdown or hosedown rating, so skip it for pressure-wash areas or anywhere it would see direct spray.
2) What are the actual box dimensions on the B-Line 12124 RTHC enclosure?
12 inches high, 12 inches wide and 4 inches deep, in 16 gauge carbon steel. The 4 inch depth is the number to check first: it sets how much room you have behind the cover for wire bending space, terminal blocks or a small din rail assembly.
3) Does the B-Line RTHC junction box come with knockouts, or do I have to punch my own conduit holes?
It ships with 5 knockouts already provided, so for a straightforward feed-through you may not need to punch anything. Anything beyond that, or a different conduit size, you punch yourself in the 16 gauge carbon steel body.
4) Can I padlock this B-Line outdoor enclosure shut?
Yes, the 12124 RTHC has a padlock provision on the door. The cover is hinged on a formed top hinge and is removable, so a tech can lift it off entirely during rough-in and hang it back for final inspection.
5) How does this B-Line box mount to the wall, and is it a one-man hang?
Surface mount through embossed thru holes in the back panel, which keep the fastener heads from breaking the enclosure's rain integrity the way an open drilled hole would. At 8.4 lb empty it is a one-person hang on masonry anchors or lag screws into structure.
6) Is the B-Line 12124 RTHC UL listed, and is it made in the USA?
It is built to UL 50, the standard covering enclosures for electrical equipment, and country of origin is the United States. That combination is usually what an institutional or government spec is asking for on a junction box submittal.
7) Should I use a hinged cover box like the RTHC or a screw-cover junction box?
Pick the hinged RTHC when the box gets opened more than once: terminations you will re-land, controls you will troubleshoot, anything you want to padlock. A screw cover is fine for a buried-in-the-wall splice you never touch again, but a 12 x 12 outdoor box on a wall almost always ends up being opened, and a hinged top-hinge cover means nothing gets dropped off a ladder.
8) Is carbon steel the right choice for a coastal or chemical environment?
The 12124 RTHC is painted carbon steel, which suits general outdoor and industrial walls. For salt air, wash chemicals or corrosive process areas, step up to a stainless or non-metallic 4X enclosure instead, since paint over carbon steel will eventually undercut at any scratch or field-punched knockout.
9) Will the 12124 RTHC match the grey enclosures already on my building?
It is painted ANSI 61 grey, the standard light grey used across most industrial electrical enclosures, so it will read as a match next to typical panel and pull box finishes on the same wall.
How fast can I get the B-LINE 12124 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 12124 RTHC come with a warranty?
Absolutely. The B-LINE 12124 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 12124 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 12124 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.