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ABB
Starting at
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ABB Formula A2ENCL250 Series Surface-Mount Electrical Enclosure
The ABB Formula A2ENCL250 Series Surface-Mount Electrical Enclosure is built to house and protect electrical components in a surface-mounted configuration for both indoor and outdoor-adjacent installations. This enclosure is available in two NEMA ratings to match the installation environment: NEMA 1 for indoor / general-purpose applications and NEMA 3R for outdoor / rainproof applications that require protection against rain, sleet, and external ice formation. Every enclosure in the A2ENCL250 Series ships in a standard package quantity of 1 ea, making it easy to specify and stock alongside other ABB electrical distribution equipment for a coordinated, code-aware installation.
Key Features
- Series: Part of the ABB Formula A2ENCL250 Series of enclosures.
- Selectable NEMA Rating: Available in NEMA 1 (indoor / general purpose) or NEMA 3R (outdoor / rainproof, protecting against rain, sleet, and external ice) depending on the installation environment.
- Surface Mount Configuration: Designed for surface-mounted installation as part of an electrical distribution system.
- Packaging: Ships 1 ea per package for straightforward ordering and inventory management.
- Brand Assurance: Manufactured by ABB, a recognized supplier of electrical distribution and enclosure equipment.
Certifications & Compliance
- NEMA 1 Rated option for indoor / general-purpose use.
- NEMA 3R Rated option for outdoor / rainproof use, providing protection against rain, sleet, and external ice formation.
Technical Specifications
- Series: A2ENCL250
- Configuration: Surface Mount
- NEMA Enclosure Rating: NEMA 1 or NEMA 3R (select at checkout)
- Packaging: 1 ea
Typical Applications
- Indoor and General-Purpose Electrical Installations (NEMA 1)
- Outdoor and Exterior Electrical Installations (NEMA 3R)
- Surface-Mounted Enclosure Housing for Electrical Components
- Rain and Ice-Prone Environment Installations
- Commercial and Industrial Wiring Systems
- New Construction and Renovation Electrical Projects
Why ABB?
ABB brings a surface-mount enclosure design to the Formula A2ENCL250 Series, offering contractors and facility teams the flexibility to select either a NEMA 1 indoor / general-purpose rating or a NEMA 3R outdoor / rainproof rating to match the installation environment. Choosing ABB for enclosure needs supports a coordinated, code-aware approach to both interior and exterior electrical distribution work.
Manufacturer Resources
Product Specs
- Buy American Act (BAA) Compliant:
- Contact Manufacturer
- American Recovery and Reinvestment Act (ARRA) Compliant:
- Contact Manufacturer
- Country of Origin:
- UKN
- Department:
- Electrical
- Product Group:
- Boxes & Enclosures
- Product Type:
- Enclosure
- Series:
- A2ENCL250
- Configuration:
- Surface Mount
- Product Subgroup:
- Enclosures
ABB A2ENCL250S – Frequently Asked Questions
1) Does the ABB Formula A2ENCL250 enclosure come in an indoor version, or only outdoor?
Both. The A2ENCL250 Series is ordered two ways: A2ENCL250R is the NEMA 3R outdoor/rainproof enclosure, and A2ENCL250S is the NEMA 1 indoor/general purpose enclosure. Pick the R suffix for anything exposed to weather, the S suffix for dry interior locations only.
2) Can I mount an ABB A2ENCL250R enclosure outdoors on an exterior wall?
Yes. The A2ENCL250R is a surface-mount enclosure rated NEMA 3R, which protects the components inside from rain, sleet, and the formation of external ice. That makes it suitable for exterior walls and other weather-exposed, outdoor-adjacent locations. It is not a washdown or corrosion-duty rating, so for hosedown or chemical exposure you want a NEMA 4X box instead.
3) What is the closest equivalent to the ABB Formula A2 A2ENCL250R NEMA 3R enclosure from another manufacturer?
The closest match is the Rittal WM Series NEMA 3R One-Door Wall Mount Enclosure in carbon steel. Both carry a NEMA 3R rating for rain, sleet, and external ice, and both mount to a surface rather than flush into a wall. The ABB unit is part of the A2ENCL250 Series built to integrate with compatible ABB Formula A2 electrical components, while the Rittal WM is a general one-door wall-mount box with a carbon steel body.
4) If the enclosure is going indoors in a dry electrical room, is there a simpler option than the NEMA 3R version?
Yes. The A2ENCL250 Series is also offered as the A2ENCL250S, rated NEMA 1 for indoor general purpose use, which is the straightforward choice for a dry interior room where rain and ice are not a factor. If you want an indoor enclosure with a higher dust and liquid seal instead, the Rittal 1338000 AX Compact Control Cabinet is rated IP66/NEMA 12 in carbon steel.
5) What should I use instead of the A2ENCL250 enclosure in a washdown or corrosive area?
The A2ENCL250R is rated NEMA 3R, which addresses rain, sleet, and external ice formation but is not a washdown rating. For an environment calling for a higher seal, the Square D EM3570ENC enclosure is rated NEMA 4X, and the Rittal 1338000 AX Compact Control Cabinet is rated IP66/NEMA 12. Note that the Square D unit is built specifically to house PowerLogic EM357x meters, so confirm your components fit its interior before substituting.
6) What is the difference between NEMA 1 and NEMA 3R on the ABB A2ENCL250 enclosure?
NEMA 1 (the A2ENCL250S) is a general purpose indoor enclosure, meant for dry interior spaces where the only concern is incidental contact with the live parts inside. NEMA 3R (the A2ENCL250R) adds protection against falling rain, sleet, and external ice formation, which is what you need on an exterior wall, a rooftop, or an unconditioned space open to weather. Same Formula A2 surface-mount platform, different environment.
7) Is the ABB Formula A2 enclosure flush mount or surface mount?
Surface mount. The A2ENCL250 Series mounts on the face of the wall or structure rather than recessing into it, which is why it works for exterior and retrofit installs where you are not cutting into finished construction.
8) Will the ABB A2ENCL250 enclosure work with ABB Formula breakers and components?
That's what it is built for. The A2ENCL250 Series is part of the ABB Formula A2 line and is intended to house compatible ABB electrical components in a coordinated assembly. If you are mixing in another manufacturer's devices, confirm the device mounting against the Formula A2 chassis before you commit.
9) What are some alternatives to the ABB A2ENCL250R if I need a NEMA 3R wall-mount enclosure?
The Rittal WM Series NEMA 3R one-door wall mount enclosure in carbon steel is the closest cross-brand equivalent for an outdoor rainproof wall box. If your install is indoors and you need a compact control cabinet instead, the Rittal AX carbon steel cabinet is rated IP66/NEMA 12 for dust and dripping liquid. For a washdown or corrosive location, neither the ABB 3R nor a NEMA 12 box applies, and a NEMA 4X enclosure such as the Square D EM3570ENC for PowerLogic EM357x meters is the type to look at.
10) Is the Rittal FlatBox 7507110 a substitute for the ABB A2ENCL250 enclosure?
No. The Rittal 7507110 FlatBox is a 19 inch 9U wall-mount enclosure in carbon steel, meaning its interior is built around 19 inch rack-mounted equipment in rack units. The ABB A2ENCL250 Series is a surface-mount enclosure for housing electrical components in a distribution system, with the A2ENCL250R carrying a NEMA 3R outdoor rating. They look similar as wall-hung boxes but are provisioned for different equipment.
11) Our standard is a single-door steel wall enclosure. How does the ABB A2ENCL250 compare to the Rittal 1034250-11?
The Rittal 1034250-11 is a WM Series single-door wall-mounted enclosure with a carbon steel body. The ABB A2ENCL250 Series mounts to the surface as well, and is offered both as the NEMA 3R A2ENCL250R for rain and ice exposure and the NEMA 1 A2ENCL250S for indoor general purpose locations, so a facility standardizing on one series can cover indoor and outdoor-adjacent openings from the same family and coordinate with compatible ABB Formula A2 components.
12) How many enclosures do I get per order with the A2ENCL250?
One. The ABB Formula A2ENCL250 enclosure ships as a standard package quantity of 1 ea, so each line item you order is a single box, not a carton of multiples.
13) Is the ABB A2ENCL250 enclosure Buy American Act compliant for a government job?
BAA and ARRA status on the A2ENCL250 Series is determined by the manufacturer, and the country of origin is not established on our record. For a federally funded project with domestic sourcing requirements, verify compliance with ABB for the specific catalog number before you submit it.
How fast can I get the ABB A2ENCL250S delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 A2ENCL250S come with a warranty?
Absolutely. The ABB A2ENCL250S is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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