A leading manufacturer in secondary bus systems, Watteredge’s 3 Phase Delta Closures and Bus Assemblies are commonly specified by OEM furnace manufacturers.

Our custom fabricated 3 phase copper delta closures and bus assemblies are the product of choice in the steel melting industry to close the secondary delta of a high current three phase transformer. It also conducts the current from the transformer through a vault wall to the power cables.

As steel production requirements have increased over the years, power requirements for the steel melting process has increased. By the 1960s, higher current requirements have made it impractical to manufacture the secondary bus system as an air cooled assembly, giving rise to today’s needs for a water cooled bus assembly.

3 Phase Delta Closure Custom Design and Manufacturing Capabilities

Watteredge designs and manufactures delta closures to meet the most demanding requirements. Our engineers can help you choose the right type of copper and the optimal fabrication methods to meet the most demanding applications.

We offer complete design capabilities that include machining, forming, brazing, welding and plating processes. Watteredge’s in-house engineering expertise enables us to produce innovative designs of high-performing custom copper products.

3 Phase Delta Closures Options and Accessories

• Air Cooled Closures
• Water Cooled Closures
• Silver Plated Terminals
• Clamped Transformer Flags
• Bolted Transformer Flags
• Braided Flex Interface
• Laminated Flex Interface
• Power Cables

Typical 3 Phase Delta Closure Copper Bus Applications

• Steel Making / Steel Melting – Electric Arc Furnace
• Steel Making / Steel Melting – Ladle Furnace