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SBU-Series 208V-480V Switchboard

208V, 480V, 600V - Low Voltage Paralleling, Transfer, & Distribution Fully Assembled Electrical Switchboard Up to 4000A Main Bus

This complete line of UL 891 Certified 208V – 690V indoor and outdoor switchgear is the ultimate in flexibility and has options available to meet virtually any power system needs.

Custom and Standard Switchboards

  • Switchboards can be custom-designed or use standard configurations to meet your specific dimensional and electrical requirements.
  • They include fully integrated components from leading manufacturers, such as:
    • Automatic transfer switches
    • Surge Protection Devices (SPD)
    • Distribution transformers
    • PLC or relay-based transfer schemes
    • Automation, metering, and monitoring systems
  • Circuit breakers and fusible switches can be mounted individually or as part of a group.
  • Choose from indoor or outdoor enclosures, available in a wide range of durable colors and materials to match your installation needs.
UL 891 Listed SBU-Series

UL 891 Certified
Voltage Range: 208V – 690V, 3Ø
Frequency Compatibility: 60Hz or 50Hz
Construction: Silver-plated copper bus
Standard Bus Ampacity: Up to 4000A
Busbar Connections: Features a NEMA standard hole pattern
Bus Access & Cable Entry
Front or Rear Access for either top or bottom cable entry
Insulated Case Circuit Breakers
Molded Case Circuit Breakers
Intelligent close prevents simultaneous connection of multiple generators to dead bus

208V-480V-UL-Listed-Low-Voltage Paralleling Switchgear APT Power

Low Voltage Switchgear Options

Some of the available options include:

  • Automatic Load Transfer Switching operation
  • Automatic Main-Tie Main operation
  • Configurations with multiple Main and multiple Tie circuit breakers
  • Incorporation of any size dry type transformers
  • Automatic paralleling of multiple generators for Prime Power application
  • Automatic paralleling of multiple generators for Co-Generation application
  • Automatic paralleling of multiple generators for Peak-Shaving application
  • Automatic paralleling of dissimilar prime movers such as: gas turbines, diesel engines, natural gas reciprocating engines, landfill and digester gas reciprocating engines, combustion turbines, synchronous and induction generators, inverter based systems, motor-generators, wind and solar driven generators
  • Seamless load transfer between power sources
  • Solid, low impedance and high impedance grounded systems
  • Indoor (NEMA 1), Outdoor non walk-in (NEMA 3R) and Outdoor walk-in (pre-engineered heated and air conditioned equipment enclosure) configurations
  • Heavy skid mounted switchgear and substations
  • Provisions for maintenance grounding of the feeder cables
  • Web enabled, remote monitoring and control
  • Remote control and relay panels
  • Remote access switchgear control line-ups for ultimate operator safety

Product Literature

APT Control System Modules

Engineering Bid Specifications

Installation Drawings & Diagrams

Quick Connection Switchgear Information

The APT MF2-Series Generator/Loadbank Quick Connect Switchgear is designed to allow quick and safe connection of either a medium voltage mobile generator set or a low voltage mobile generator connected to a medium voltage step up transformer to facilities experiencing loss of power. The MF2-Series is ideal for facilities that require medium voltage (2.4kV to 15kV). The switchgear is rated Type 3R for outdoor installation. Permanent installation and connection of the switchgear to the facility power distribution system will minimize any unplanned power outages.

Medium Voltage Generator Quick Connection Switchgear

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SBU-SERIES

Low Voltage Switchboard & Switchgear

208V - 690V UL 891 Listed Switchboard Solutions

Flexible low-voltage switchboard systems for power distribution, automatic transfer, generator paralleling, and integrated power system control.

SBU-Series low voltage UL 891 listed switchboard and switchgear
View Brochure Request a Quote View Specifications
Voltage Range
208V - 690V
Main Bus
Up to 4000A
Frequency
50 / 60 Hz
Enclosures
NEMA 1 & 3R
Main Bus
Silver-Plated Copper
Standard
UL 891 Listed

Key Specifications

Voltage
208V - 690V
Main Bus
Up to 4000A
Frequency
50 / 60 Hz
Enclosures
NEMA 1 & 3R
Bus
Silver-Plated Copper
Standard
UL 891

Overview

The SBU-Series is a flexible low-voltage switchboard platform for power distribution, automatic source transfer, generator paralleling, and integrated system control.

Silver-plated copper bus, molded or insulated case circuit breakers, metering, protection, automation, and control components can be integrated into a single switchboard lineup.

Indoor NEMA 1 and outdoor NEMA 3R construction are available, with front or rear access and top or bottom cable entry options to accommodate project-specific installation requirements.

Explore Configurations

Standard Construction

SBU-Series low voltage switchboard construction
  1. 01 Silver-Plated Copper Main Bus
  2. 02 Molded or Insulated Case Circuit Breakers
  3. 03 NEMA 1 or NEMA 3R Enclosures
  4. 04 Front / Rear Access with Top / Bottom Cable Entry

Final lineup and component arrangement vary by project requirements.

Why It Matters

Flexible Configurations

Configure utility, generator, feeder, transfer, and paralleling sections around project requirements.

Integrated Control

Metering, protection, automation, operator interfaces, and monitoring can be incorporated into the lineup.

Factory-Assembled System

The switchboard is assembled, connected, and wired before shipment to reduce required field interconnections.

Serviceable Construction

Accessible sections and removable components support maintenance, servicing, and future system changes.

How It Works

SBU-Series low voltage switchboard system Utility or generator power sources enter the SBU-Series switchboard, which controls, transfers, or distributes electrical power to facility loads. POWER SOURCES Utility / Generator CONFIGURED SOURCES SBU-SERIES SWITCHBOARD & CONTROL DISTRIBUTED POWER FACILITY Feeders / Loads

Power sources enter the SBU-Series through project-specific main or generator sections. The switchboard distributes power to facility feeders while optional transfer, paralleling, protection, metering, and control functions coordinate the system as required.

View Configurations Explore Configurations
SBU-Series low voltage switchboard and control switchgear

Need Help Configuring Your Switchboard?

Every SBU-Series lineup can be configured around the electrical, operational, and installation requirements of the project. Our sales team can help determine the appropriate ratings, source arrangement, enclosure, and control options for your application.

Voltage Bus Ampacity Source Configuration Enclosure Controls

Our team can help with:

  • Application review
  • Source & transfer configuration
  • Breaker & bus requirements
  • Custom switchboard lineups
Talk to a Product Specialist

Technical Specifications

Voltage
208V–690V, 3Ø
Frequency
50Hz / 60Hz
Main Bus Ampacity
Up to 4000A
Bus Material
Silver-plated copper
Busbar Connections
NEMA standard hole pattern
Access / Cable Entry
Front or rear access / top or bottom entry
Enclosures
NEMA 1 indoor / NEMA 3R outdoor
Circuit Breakers
Molded case / insulated case
Standard Construction
Carbon steel / ANSI 61 Gray powder coat
Listing
UL 891 Listed & Labeled

Applications

Flexible low-voltage switchboard solutions for distribution, transfer, generation, and control.

Power Distribution

Distributes low-voltage power from utility or generator sources to facility feeders and downstream loads.

Automatic Source Transfer

Supports automatic transfer between utility and generator sources using project-specific operating sequences.

Generator Paralleling

Coordinates multiple generator sources for standby, prime power, and other parallel generation applications.

Motor Control & Drives

Integrates VFDs, soft starters, contactors, overload protection, and motor control equipment.

Final application and configuration depend on facility requirements and electrical system design.

FAQ

What is the SBU-Series?

The SBU-Series is a UL 891 listed low-voltage switchboard platform for power distribution, automatic source transfer, generator paralleling, and integrated power system control.

What voltage and bus ratings are available?

SBU-Series switchboards are available for 208V through 690V, 3-phase systems with standard main bus ampacity up to 4000A.

Can the SBU-Series provide automatic source transfer?

Yes. SBU-Series systems can be configured for automatic source transfer, including open and closed transition arrangements and other application-specific operating sequences.

Can multiple generators be paralleled?

Yes. Generator protection and control sections can be configured to automatically parallel multiple generators within the same or multiple switchboard sections.

Are indoor and outdoor configurations available?

Yes. NEMA 1 construction is available for indoor installations and NEMA 3R construction is available for outdoor installations.

Technical Resources

SBU Brochure

View Online

Engineering Specs

View Online

Outdoor Switchgear

View Online

APTView SCADA

View Online

Ready to Get Started?

Our team can help review your system voltage, bus ampacity, source arrangement, breaker requirements, enclosure, transfer sequence, and control requirements.

Contact our sales team to discuss your application and configure an SBU-Series switchboard around your facility and power system requirements.

Request a Quote