What is the difference between a main lugs only (MLO) and main circuit breaker (MCB) panelboard?

An MLO panelboard has no main overcurrent device — the incoming conductors terminate directly on the main lugs, and overcurrent protection must be provided upstream. An MCB panelboard includes a main circuit breaker that serves as both the disconnect and the primary overcurrent protection for all branch circuits. CODI builds both configurations; the right choice depends on where overcurrent protection is located in your distribution system and whether the panelboard will serve as the service entrance.

What breaker brands does CODI support in its panelboards?

CODI panelboards accept branch circuit breakers from Eaton, Siemens, ABB, LS Electric, and Schneider Electric. You specify the breaker manufacturer at the time of order to match your facility standard or existing infrastructure. There is no proprietary breaker requirement and no downstream service dependency on a single manufacturer.

Can a CODI panelboard be configured for outdoor installation?

Yes. CODI panelboards are available in NEMA 1 (indoor), NEMA 3R (outdoor, rain and sleet rated), NEMA 4 (watertight), and NEMA 4X (corrosion-resistant) enclosure ratings. Outdoor and washdown applications are standard configurations, not special orders.

Low-Voltage UL 891 Switchboards

SWITCHBOARDS

Manages service-entrance and main power distribution for commercial, industrial, and critical facilities.

CODI builds custom UL 891 listed switchboards for service entrance, main distribution, emergency power, and commercial power distribution applications. Each dead-front switchboard is engineered around your voltage, ampacity, fault current, breaker standard, enclosure rating, and site-specific requirements.

Manufactured in Littleton, Colorado, CODI switchboards give facility teams a configurable alternative to catalog-only equipment, with clean documentation, multi-brand breaker flexibility, and shorter lead times than traditional national OEM channels.

CONFIGURE CONNECT

10-12

WEEK LEAD TIME

BUILT THE CODI WAY

STRUCTURAL ENGINEERING

In-house electrical and mechanical engineering

MANUFACTURING EXCELLENCE

100,000 sq. ft. Colorado manufacturing facility

RAPID ORDER PROCESSING

Direct access to the team reviewing, quoting and building your equipment.

BUILT TO YOUR SPECS IN THE USA

OEM-agnostic configurations. Built to your specifications. American manufacturing.

SPECIFICATIONS

Specs At A Glance

Standard

UL 891 Listed

Ampacity

400A–5000A

Voltage

120/208V–347/600V

SCCR

65–200kAIC

Enclosures

Type 1 / 3R / stainless steel 3R

Full Specifications

Power Controls Glossary

COMPLIANCE

Applicable Standard: UL 891 - Dead-Front Switchboards
Applicable Codes: NEC (ANSI/NFPA 70); CSA C22.2 No. 244 (Canada, when applicable)
Maximum Voltage Rating: Up to 600 V AC nominal (maximum 1,000 V within UL scope)
Intended Application: Commercial and Light Industrial Power Distribution

RATINGS

Input Voltages Available: 120/208 V, 240 V, 480/277 V, 600/347 V AC
Frequency: 60 Hz
Main Bus Ampere Rating: 400 A - 5,000 A (higher ratings available by design)
Short-Circuit Current Rating (SCCR): Up to 200 kAIC at specified voltage
Short-Time Withstand: 3-cycle withstand (0.05 seconds)

CONSTRUCTION/BUILD

Construction: Dead-front per UL 891
Enclosure: Galvannealed steel with powder-coat or stainless steel finish
Rating: NEMA 1 (indoor) and NEMA 3R (outdoor)
Seismic: Available with bracing to meet project-specific requirements per IBC 1613 and ASCE 7
Mounting: Free-standing configurations standard; wall-mount availability dependent on ampacity and breaker frame size
Access: Padlockable front doors with three-point latching
Cable Entry: Removable gland plates and bottom-feed provisions for conduit routing and cable termination
Bus: High-conductivity silver-plated copper or tin-plated aluminum; fully rated neutral and ground bus options available

COMPONENTS

Protective Devices: Molded-case or insulated-case circuit breakers

SAFETY

SCCR: Rated and marked per UL 891 to project-specific short circuit current requirements
Trip Settings: LSI and LSIG configurations available
Arc-Flash Risk Reduction: Energy-reducing maintenance settings per NFPA 70 240.87; compatible with AERMS, DAS (Siemens), and RELT (ABB)
Zone-Selective Interlocking: Available where applicable
Ground Fault Protection: Per NFPA 70B
Thermal Inspection: Compliance-ready designs for routine infrared inspection

KEY FEATURES

Custom Configuration

Engineered to your project's exact voltage, ampacity, fault current, and breaker requirements — not a catalog solution.

UL 891 Listed Dead-Front

Every switchboard ships UL 891 listed as a dead-front assembly, preventing access to live bus and components during normal operation.

High-Capacity Bus

Main bus ratings from 400A to 5000A; silver-plated copper or tin-plated aluminum bus available.

High Fault Current Ratings

Short-Circuit Current Ratings (SCCR) 65kAIC standard up to 200kAIC to match facility fault current requirements.

Multi-Brand Breaker Compatibility

Accommodates molded-case and insulated-case circuit breakers from major manufacturers (Siemens, Eaton, ABB, Schneider Electric, and LS Electric) — no proprietary lock-in.

Enclosure Options

TYPE 1 (indoor) and TYPE 3R (outdoor) configurations; stainless steel available for corrosive environments.

FAQ

What is a UL 891 dead-front switchboard?

A UL 891 switchboard is a low-voltage power distribution assembly listed under the UL 891 standard for dead-front switchboards. Dead-front construction means internal barriers prevent accidental contact with live busbars and components during normal operation or maintenance access. CODI switchboards are factory-tested and ship with a full documentation package including wiring diagrams, bill of materials, and UL label.

How does a switchboard differ from a panelboard?

Switchboards are generally larger, higher-capacity assemblies designed for service entrance and main distribution at the top of a building's electrical hierarchy. They are built to UL 891 and typically handle 400A to 5000A. Panelboards are downstream distribution equipment, typically 100A to 1200A, built to UL 67, and used to distribute branch-circuit power to individual loads. In most facilities, power flows from the utility through a switchboard and then to panelboards.

What short circuit current ratings (SCCR) are available?

CODI switchboards are standard at 65kAIC bracing with options available up to 200kAIC to match facility fault current requirements. SCCR is rated and marked per UL 891. Arc-flash risk reduction configurations are available, including energy-reducing maintenance settings per NEC 240.87 and compatibility with Siemens DAS and ABB RELT systems.

Can CODI switchboards serve as the service entrance for a facility?

Yes. CODI switchboards are available with optional Service Entrance (SE) rating, which allows the unit to function as the primary disconnect point per NEC 230. This is specified at the time of order and requires the appropriate main disconnect device and labeling per NEC 230.70 and 230.91.

SEE. BUILD. TALK.

CONFIGURE walks you through the build: ratings, enclosure, bus, and connection options, assembled into a unit matched to your project.

This information is what we use to provide a budgetary quote.