Understanding Low Voltage Switchboards: The Backbone of Electrical Distribution


Butcher Power Products specializes in manufacturing UL 891 Low Voltage Switchboards for projects and industries that need power distribution solutions quickly.  Low voltage switchboards are essential components of electrical distribution systems, acting much like the traffic lights of an electrical system. They manage power supply, ensure safe electricity distribution, and provide protection against mechanical and thermal stresses from short-circuit currents. Additionally, they safeguard against overload currents, over-circuit currents, and insulation faults, making them a crucial element in maintaining a safe and efficient electrical infrastructure.

UL 891 Low Voltage Switchboards

What is a Low Voltage Switchboard?

A low voltage switchboard is typically a free-standing enclosure containing circuit breakers, bus bars, and power cables. These switchboards are equipped with safety measures such as circuit breakers and fuses to manage and protect the electrical supply. Low voltage generally refers to electrical systems operating at less than 1000 volts, with a normal current capacity of up to 7000 amperes. While low voltage is less dangerous than high voltage, which is used to power larger devices, it still requires careful management to prevent electrical hazards.

electricial switchboards

Key Components and Features

Structural Elements

  • Enclosures: Low voltage switchboards are housed in robust, free-standing enclosures that can be designed for indoor or outdoor use.
  • Bus Bars and Power Cables: These are critical for distributing electricity safely and efficiently within the switchboard.

Protective Devices

  • Circuit Breakers and Fuses: Essential for interrupting electrical flow during faults to prevent damage and ensure safety.
  • Bus Bracing: Typically rated at 65 kAIC, with options for 100 or 200 kAIC, providing additional protection against short-circuit currents.

Customization and Integration

  • Component Options: Switchboards can include integrated components such as automatic transfer switches, surge protection devices (SPD), distribution transformers, and programmable logic controllers (PLC) or relay-based transfer schemes as well utility metering devices.
  • Mounting Flexibility: Devices within the switchboard can be mounted individually (vertically) or as a group (panel/horizontally).
  • Accessibility: Front, rear, and side accessibility options ensure ease of maintenance and operation.
  • Bus Material Options: Choices include silver-plated copper, tin-plated aluminum, or bare copper, with fully rated systems for both copper and aluminum.
  • Customization: Options for custom sheet metal and bus configurations to accommodate specific connections like busway and transformers.

Technical Specifications

  • Voltage: Up to 600Vac and up to 250Vdc maximum.
  • Ampacity: Ranges from 400A to 12000A maximum bus rating.
  • Enclosure Types: Type 1 or 3R NEMA enclosures.
  • Short Circuit Rating: Tested to withstand short circuits for 3 cycles (.05 seconds) or immediate trip conditions.
  • Paint Finish: Standard paint is ANSI 61, with other colors available as options.


Understanding Low Voltage Switchboards


Applications and Benefits

Butcher Power Products Low Voltage Switchboards are highly adaptable, making them suitable for a variety of applications. They can be custom-designed or utilize standard configurations to meet specific dimensional and electrical requirements. This flexibility ensures they can be tailored to fit the unique needs of any project.


ul 871 low voltage boards

Safety and Efficiency

The pre-wired and fully assembled nature of these switchboards, tested in a controlled environment, reduces installation time and minimizes the risk of errors. This not only saves valuable material handling and installation time at the job site but also ensures a higher level of safety and reliability.

Understanding Low Voltage Switchboards

Switchboards can accommodate a range of protective device accessories and integrated components from leading manufacturers. This includes options for automation, metering, and monitoring, making them a comprehensive solution for modern electrical distribution needs.


Low voltage switchboards are a fundamental part of electrical distribution systems, providing critical management and protection of the power supply. Their ability to be customized and integrated with various components ensures they can meet the specific needs of any project, from small commercial buildings to large industrial facilities. By ensuring safe and efficient power distribution, low voltage switchboards play a vital role in maintaining the integrity and reliability of electrical systems.