Main Horizontal Busbar for Motor Control Centers

Product Specifications

Technical details and manufacturing context for Main Horizontal Busbar

Definition

The Main Horizontal Busbar is a critical electrical component within a Motor Control Center (MCC) that serves as the central power distribution backbone. It is typically a rigid, high-conductivity metal bar or assembly that runs horizontally across the top or rear of the MCC structure. Its primary function is to receive incoming power from the main supply (via a main circuit breaker or disconnect) and distribute it efficiently and safely to the vertical busbars or feeder sections that supply individual motor starters, control circuits, and other loads within the MCC. It ensures reliable power transfer with minimal voltage drop and provides a structured, organized path for high-current electricity throughout the control center. The busbar is designed to handle rated currents typically from 800 A to 6300 A, with a rated voltage of 690 V AC, and short-circuit withstand ratings from 50 kA to 100 kA for 1 second. It is manufactured from high-conductivity materials such as electrolytic copper (Cu-ETP) or aluminum alloy 6063, with optional silver or tin plating for surface coating. The cross-sectional area ranges from 240 mm² to 2×10×100 mm, and the material conductivity is at least 56 MS/m for copper or 34 MS/m for aluminum. The busbar's temperature rise above ambient is limited to 70 K at rated current, and it is designed for an insulation voltage of 1000 V. The degree of protection typically ranges from IP54 to IP65, and the operating temperature range is -40°C to 85°C. The weight per meter varies from 2.1 kg/m to 8.9 kg/m depending on material and cross-section. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The busbar complies with relevant standards such as IEC 61439-1, IEC 60028, and GB/T 5585.1, which serve as procurement and verification references, not as proof of certification.

Working Principle

The Main Horizontal Busbar operates on the principle of electrical conduction. When energized by the main power source, it acts as a common electrical node at a specific voltage (e.g., 480V AC). It provides a low-resistance, high-current-capacity path made from conductive materials like copper or aluminum. Electrical power flows along this busbar due to the potential difference (voltage) between it and the return path (neutral/ground). The busbar's design minimizes impedance, heat generation, and electromagnetic interference, ensuring stable power delivery to all connected vertical sections or feeder taps in the MCC. It is typically insulated or isolated within the MCC structure for safety.

Common Materials

Copper (Electrolytic Copper, Cu-ETP), Aluminum (Alloy 6063 or similar), Silver or Tin Plating (for surface coating)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Current	800–6300 A	Determines busbar cross-section and temperature rise.IEC 61439-1
Rated Voltage	690 V AC	Standard low-voltage distribution level.IEC 61439-1
Short-Circuit Withstand Rating	50–100 kA	Peak withstand for 1 s; defines bracing and support spacing.IEC 61439-1
Temperature Rise	≤70 K	Above ambient at rated current; higher reduces insulation life.IEC 61439-1
Cross-Sectional Area	240–2×10×100 mm²	Copper or aluminum; affects current capacity and voltage drop.
Material	Cu-ETP or Al 6101	Copper for higher conductivity; aluminum for cost savings.GB/T 5585.1
Conductivity	≥56 MS/m	For copper; aluminum ≥34 MS/m.IEC 60028
Tensile Strength	200–280 MPa	Ensures mechanical integrity under short-circuit forces.GB/T 5585.1
Insulation Voltage	1000 V	Rated insulation voltage for clearances and creepage.IEC 61439-1
Degree of Protection	IP54–IP65	Higher IP for dusty or wet environments.IEC 60529
Operating Temperature	-40–85 °C	Ambient range; affects material expansion and insulation.
Weight per Meter	2.1–8.9 kg/m	Depends on material and cross-section; affects structural support.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Busbar Conductor Part
Primary conductive element that carries electrical current. Typically a solid or laminated bar.

Material: Copper or Aluminum
Insulation/Coating Part
Provides electrical insulation, corrosion resistance, and reduces surface oxidation. May be epoxy powder coating, heat-shrink tubing, or bare with air insulation in isolated compartments.

Material: Epoxy Resin, Polyester, or similar insulating material
Support Insulators Part
Mount and physically support the busbar within the MCC structure, providing electrical isolation from the grounded enclosure.

Material: Glass-Reinforced Polyester, Porcelain, or Thermoplastic
Connection Joints/Bolts Part
Mechanical and electrical connections for joining busbar sections or attaching tap-off points. Ensure low-resistance, secure connections.

Material: Copper or Steel (plated)

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Motor Control Center

View system integration details

Manufacturers of Main Horizontal Busbar

Manufacturer profiles associated with Main Horizontal Busbar.

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Frequently Asked Questions

What is the function of the Main Horizontal Busbar in an MCC?

It distributes incoming power from the main supply to vertical busbars or feeder sections that supply individual motor starters and control circuits, ensuring reliable power transfer with minimal voltage drop.

What materials are commonly used for the Main Horizontal Busbar?

Common materials include electrolytic copper (Cu-ETP) and aluminum alloy 6063, with optional silver or tin plating for surface coating. The choice affects conductivity and cost.

What are typical rated current and voltage ranges?

Rated current typically ranges from 800 A to 6300 A, and rated voltage is 690 V AC. These values are reference ranges and must be confirmed for the specific model.

Which standards apply to the Main Horizontal Busbar?

Relevant standards include IEC 61439-1 for low-voltage switchgear and controlgear assemblies, IEC 60028 for copper conductivity, and GB/T 5585.1 for busbar materials. These are verification references, not certification proof.

Data Basis

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Preliminary Technical Classification

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pressure:	N/A (electrical component, not fluid handling)
other spec:	Current rating: Typically 600A to 5000A, Short-circuit withstand: 50kA to 200kA for 1-3 seconds, Voltage rating: Up to 1000V AC
temperature:	-40°C to +105°C (ambient operating range)

Main Horizontal Busbar

Product Specifications

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