ABB RNSB NEMA 3R MLO Distribut...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$14,312.50
ABB NEMA 3R MLO Distribution Panelboard Enclosure

ABB RNSB NEMA 3R MLO Distribution Panelboard Enclosure

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Model: RNSB06L6040R

In Stock (leaves warehouse same day if ordered before 3pm ET)

$14,312.50
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ABB RNSB NEMA 3R MLO Distribution Panelboard Enclosure

The ABB RNSB NEMA 3R MLO Distribution Panelboard Enclosure is a main-lug-only (MLO) distribution enclosure engineered for professional electrical installations that demand outdoor or wet-location durability. Rated NEMA 3R, this enclosure shields internal components from rain, sleet, and external ice formation, making it suitable for exterior mounting on commercial and industrial sites. The enclosure is offered across a range of ampere ratings from 600A to 1200A, allowing contractors to match the distribution section to the specific load requirements of the job. Configured for branch circuit distribution, the enclosure ships without breakers so installers can select and install branch breakers to match the specific load and code requirements of the project.

Key Features

  • NEMA 3R Rating: Enclosure is rated NEMA 3R for outdoor and wet-location use, shielding internal components from rain, sleet, and external ice.
  • Main Lug Only (MLO) Configuration: No main breaker is installed, allowing installers to design a custom upstream overcurrent protection scheme for the distribution section.
  • Ampere Rating Range: Available across ratings from 600A to 1200A to support a wide range of commercial and industrial branch circuit loads.
  • Multi-Circuit Capacity: Provides multiple available circuit positions to support branch circuit distribution across commercial and industrial loads.
  • No Breakers Included: Ships as an empty enclosure so installers can select and install branch breakers to match project-specific load and code requirements.
  • Family Sizing Available: Offered across the ABB enclosure lineup, including large-format footprints such as 84" x 45" style configurations, to match project space and circuit-count requirements.
  • Panelboard-Ready Design: Enclosure is purpose-built to house panelboard internals for centralized branch circuit distribution in a single housing.

Certifications & Compliance

  • NEMA 3R Rated for Outdoor and Wet-Location Use

Technical Specifications

  • Configuration: Main Lug Only (MLO)
  • Ampere Rating Range: 600A - 1200A
  • Enclosure Rating: NEMA 3R

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • Outdoor and Wet-Location Panelboard Installations
  • Load Center and Branch Circuit Distribution
  • New Construction and Retrofit Electrical Projects
  • Facilities Requiring Custom Overcurrent Protection Design

Why ABB?

ABB brings decades of electrical distribution expertise to its panelboard enclosures, and this MLO NEMA 3R enclosure reflects that engineering discipline with a design built for demanding outdoor and industrial environments. Offered across ampere ratings from 600A to 1200A and available in large-format footprints such as 84" x 45" style configurations, the ABB RNSB lineup gives electrical contractors flexibility to match enclosure size and capacity to the project. By shipping as an empty, breaker-ready enclosure, ABB gives electrical contractors the flexibility to configure a code-compliant distribution system tailored to the exact requirements of each job. Choose ABB for dependable, professional-grade panelboard enclosures that stand up to the field.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Enclosure
Configuration:
Main Lug Only (MLO)
Department:
Electrical
Product Group:
Wiring Devices
Standards:
NEMA 3R
Amperage Rating:
600A - 1200A
Product Subgroup:
Panelboards & Load Centers

ABB RNSB06L6040R – Frequently Asked Questions

1) Does the ABB NEMA 3R MLO panelboard enclosure come with breakers?
No. The ABB NEMA 3R MLO enclosure ships empty, with no main breaker and no branch breakers. You order and install branch breakers separately to match the load calculation and code requirements for the job. Budget for that on the same order, because an empty enclosure on site finishes nothing.
2) Can this ABB panelboard enclosure be mounted outdoors?
Yes, it carries a NEMA 3R rating, which covers outdoor and wet-location mounting and protects the internals from rain, sleet, and external ice formation. That makes it usable on exterior walls of commercial and industrial buildings. NEMA 3R is not a washdown or dust-tight rating, so a high-pressure hose-down or heavy airborne dust area calls for a different enclosure type.
3) What is the difference between the 600A and 1200A ABB RNSB enclosures?
Two ampere classes are offered: a 600A version, ABB part RNSB06L6040R, and a 1200A version, RNSB12L8445R. Pick by the ampacity of the feeder landing on the main lugs and by the circuit count you need to house. The 1200A unit is the larger-format housing, in the 84 x 45 inch style footprint, so confirm you have the wall space before specifying it.
4) What does main lug only mean on a panelboard, and do I still need overcurrent protection?
Main lug only means the incoming feeder lands directly on lugs inside the enclosure with no main breaker in the box. Protection for that feeder has to come from upstream, typically the device feeding it in the switchboard or the panel ahead of it. The ABB RNSB is built this way deliberately so the contractor designs the upstream overcurrent scheme to suit the project. If your design requires a local disconnecting means at the panel, an MLO section will not provide it and you need a main breaker panelboard instead.
5) What is the difference between the ABB RNSB NEMA 3R panelboard enclosure and the Square D MH Series NQ/NF enclosure?
The ABB RNSB enclosure is a NEMA 3R rated main-lug-only distribution enclosure built for outdoor and wet-location mounting, shielding internals from rain, sleet, and external ice. The Square D MH Series is an NQ/NF panelboard enclosure in Type 1 steel with a blank end wall, which is an indoor general-purpose construction. If the panelboard is going on an exterior wall or anywhere exposed to weather, the ABB RNSB is the one built for that environment; the MH Series covers dry indoor distribution.
6) Can I use this ABB enclosure for branch circuit distribution in a retrofit?
Yes. It is purpose-built to house panelboard internals for centralized branch circuit distribution, with multiple circuit positions available, and it is used on both new construction and retrofit work. Because it arrives without breakers, a retrofit lets you match new branch devices to whatever the updated load schedule calls for rather than inheriting the old configuration.
7) I am a property manager replacing an outdoor panel enclosure. Is the ABB RNSB something my electrician can install?
It is contractor-installed equipment, not a plug-in replacement. What you are buying is the outdoor-rated housing and the lug section; the breakers are separate and your electrician selects them against the building load. Give them the amp class you need, 600A or 1200A, and confirm the wall space, since the 1200A version uses the large 84 x 45 inch style footprint.
8) What ABB part number do I quote for a 1200 amp outdoor MLO panelboard enclosure?
RNSB12L8445R is the 1200A unit in the ABB RNSB outdoor MLO line. The 600A equivalent is RNSB06L6040R. Both are NEMA 3R main-lug-only enclosures supplied without breakers.
9) I need a panelboard enclosure for an indoor electrical room, not outdoors. What should I use instead of the ABB RNSB?
For a dry indoor electrical room the Square D NQ/NF MH Series enclosure is the straightforward choice; it is a Type 1 steel enclosure with a blank end wall, intended for general-purpose indoor distribution. The ABB RNSB is a NEMA 3R enclosure, which carries the weather protection you would be paying for and not using indoors. Both are enclosures only, so branch breakers and interior are selected separately.
10) My drawing calls for a main breaker panel. Is the ABB RNSB enclosure the right item, or do I need something else?
The ABB RNSB is a main-lug-only enclosure, with no main breaker installed, so the upstream overcurrent protection is designed separately. If the drawing specifies a main breaker within the panel itself, an MLO enclosure will not satisfy that note. The Square D NQ/NF MH Series is likewise an enclosure rather than a complete panel, so it does not resolve the main breaker requirement either. Confirm whether the spec wants MLO with upstream protection before ordering.
11) Do I get breakers with the ABB RNSB enclosure or the Square D MH Series?
Neither is a breaker package. The ABB RNSB NEMA 3R enclosure ships without breakers so the installer can select branch breakers to match the load and code requirements of the project, and it offers multiple circuit positions for branch distribution. The Square D MH Series is an NQ/NF panelboard enclosure as well, a Type 1 steel housing with a blank end wall. Budget the interior and branch breakers as separate line items with either one.
12) I am standardizing outdoor distribution across a campus at 600A and 1200A. Does one family cover both?
The ABB RNSB NEMA 3R MLO enclosure line covers both, with a 600A configuration under MPN RNSB06L6040R and a 1200A configuration under MPN RNSB12L8445R, including large-format footprints such as the 84 in x 45 in style. That keeps one enclosure family and one weather rating across the campus. The Square D NQ/NF MH Series is a Type 1 indoor enclosure and would not standardize the exterior locations with it.
How fast can I get the ABB RNSB06L6040R 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 ABB RNSB06L6040R come with a warranty?
Absolutely. The ABB RNSB06L6040R 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 ABB RNSB06L6040R?
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
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