What is Bus Bar

By Bester PCBA

Last Updated: 2023-09-18

What is Bus Bar

A bus bar is a long and narrow conductor used to efficiently transfer a high amount of electrical current from one point to another on a PCB. Typically made of copper, bus bars possess versatile qualities such as low thermal and electrical resistance, high mechanical strength, and resistance to wear and tear failure. These qualities make copper an ideal material for bus bars, as it allows for high electrical conductance.

Bus bars are commonly utilized in applications where there is a need to distribute high electrical current, such as panel boards, busway enclosures, and switchgear. They serve as a means to ensure that the current is effectively delivered throughout the PCB, especially in cases where there is insufficient copper in the board to handle the required current. By mounting the bus bars on the PCB through holes or surface mount, they act as conductors, facilitating the transfer of electrical current.

Bus bars can also contribute to the capacitance of the circuit. However, simply adding a bus bar to a PCB does not solve the issue of insufficient copper to handle high current. While the bus bar itself may be able to withstand the current, the PCB as a whole may still overheat. To address this, components that require routing of high current should be directly soldered onto the bus bar.

Frequently Asked Questions

What Is the Purpose of a Bus Bar

Busbars serve the purpose of conducting electric current. Usually composed of copper or aluminum, busbars are solid and flat, wider than cables but shorter in height by up to 70 percent. Additionally, they have the capability to carry a greater amount of current compared to cables with an equivalent cross-sectional area.

What Is the Buss Bar in a Electrical Panel

Busbars are metal bars typically made of Copper or Aluminium that are used to carry high amounts of current. They play a crucial role in power distribution within an electrical control panel or consumer unit, facilitating the transfer of electricity from the supply point to the output circuits.

Why Is It Called a Bus Bar

The term busbar, sometimes spelled as ‘bus bar’ or ‘buss bar’, originates from the Latin word ‘omnibus’. This Latin term translates to English as “for all”, indicating that busbars are responsible for carrying all of the currents within a specific system.

What Does a Busbar Look Like

Busbars come in different shapes such as flat strips, solid bars, and rods. They are commonly made of copper, brass, or aluminum, either as solid or hollow tubes. The various shapes of busbars enable efficient heat dissipation, thanks to their high surface area to cross-sectional area ratio.

Is a Bus Bar Necessary

Is A Busbar Necessary In A Camper? No, a busbar is not necessary. In the past, the common practice was to directly connect the ends of each circuit to the positive terminal of the battery bank or the battery cut-off switch, as well as the Earth point.

What Is the Voltage of a Busbar

Busbar systems, specifically the Medium Voltage – Cast Resin Busbar, are designed to operate at voltages of 12 kV and 24 kV. These systems are manufactured to be used up to 5700 A as a standard application.

Why We Use Busbar Instead of Cables

Busbar is preferred over cables because it occupies less space, which is especially beneficial when dealing with high amperage. Unlike cables, busbar does not require large bend radii, allowing for a more compact installation. Additionally, the tightly compressed conductors inside the busbar are well-isolated and dependable.

Is a Bus Bar a Circuit Breaker

The bus bar system includes an isolator and a circuit breaker. It enables new circuits to branch off at any point along the busway, rather than just at one specific location where the main supply is branched.

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