Authorized ABB Distributor (Installation Products)
ABB - Installation Products K675TBC - 15/25kV, 900 Amp, Deadbreak Bushing for In-Air Applications (Pad-Mounted or Vault-Type or Submersible Transformers or Switchgear). One Factory installed 5/8-11 UNC-2A Stud included, other Stud must be Purchased Separately. Overall Length 13.75 inch, Diameter 4.50 inch. Molded Epoxy with Stainless Steel Flange. Boot and Collar.

ABB Installation Products K675TBC 15/25kV, 900 Amp, Deadbreak Bushing for In-Air Applications (Pad-Mounted or Vault-Type…

UPC: 783786629725


Documents & Media
Installation InstructionsSpecification SheetManufacturer Product Website

Contact for Pricing

Call (262) 252-1600 or email [email protected] for pricing and availability.

Overview

The ABB K675TBC Deadbreak Bushing (SKU: K675TBC) is a medium-voltage, 900 Amp component engineered for in-air applications in electrical distribution systems. Designed for use with pad-mounted transformers, vault-type transformers, submersible transformers, and switchgear, this bushing supports voltage ratings up to 25kV and continuous current ratings of 900 Amps. The K675TBC features a molded epoxy construction with a stainless steel flange for corrosion resistance and secure mounting, either by welding or external clamping. The unit includes a factory-installed 5/8-11 UNC-2A stud, with an additional stud required for completion. The bushing is 13.75 inches in length and 4.50 inches in diameter, with a conductive rubber shield at the mating surface to ensure a fully-shielded, cable-to-apparatus connection. It meets ANSI/IEEE Standard 386, with a 25kV voltage class, 125kV BIL impulse withstand, 40kV AC one-minute withstand, and 78kV DC 15-minute withstand. The bushing also supports 19kV AC corona extinction at 3pC sensitivity. The K675TBC is designed to universally accept Elastimold 600A/900A Elbow or bushing extender interfaces, making it a versatile solution for medium-voltage applications. The conductive shield is made of molded conductive EPDM, ensuring positive ground contact with the bushing insert. The shank length is 8.563 inches, suitable for both cover and side-mount installations. This model is built with an all-copper threaded connection to meet the 900 Amp capability, requiring copper-compatible components for associated products.
  • 15/25kV voltage rating with 900 Amp continuous current capacity
  • Molded epoxy construction with stainless steel flange for corrosion resistance and secure mounting
  • 13.75" length x 4.5" diameter with 8.563" shank length for cover or side-mount installations
  • Meets ANSI/IEEE Standard 386 with 125kV BIL impulse withstand and 40kV AC one-minute withstand
  • Includes factory-installed 5/8-11 UNC-2A stud; additional stud required for completion

Specifications

Application
In-Air Applications
Connection Type
Deadbreak
Current Rating
900 A
Material
Molded Epoxy Body and Stainless Steel Flange
Material
Molded Epoxy with Stainless Steel Flange
Mounting Type
Pad-Mounted or Vault-Type or Submersible Transformers or Switchgear
Size
Overall Length 13.75 inch, Diameter 4.50 inch
Size
Length 13.75 inch, Diameter 4.50 inch
Special Features
Conductive Shield made of Molded Conductive EPDM makes Positive Ground Contact with EPDM Flange of Bushing Insert. Stainless Steel Flange Resists Corrosion and can be Externally Clamped or Welded to Apparatus
Standard
ANSI/IEEE Standard 386
Temperature Rating, Maximum
149 F
Temperature Rating, Maximum
65 C
Temperature Rating, Minimum
-40 F
Temperature Rating, Minimum
-40 C
Type
Deadbreak Bushing - 900 Amps
Voltage Rating
15/25 kV
Package Dimensions (L x W x H)
0.01 IN x 0.01 IN x 0.01 IN
Package Dimensions (L x W x H)
0.0254 cm x 0.0254 cm x 0.0254 cm
Package Weight (Imperial)
9.6500 L
Package Weight (Metric)
4.3770 kg
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15/25kV, 600 Amp, Deadbreak Bushing for In-Air Applications (Pad-Mounted or Vault-Type or Submersible Transformers or Switchgear). One Factory installed 5/8-11 UNC-2A Stud included, other Stud must be Purchased Separately. Overall Length 13.75 inch, Diameter 4.50 inch. Molded Epoxy with Stainless Steel Flange. Includes Boot and Collar.

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15/25kv, Short Shank Well without Bail Tabs and Non-Replaceable Well Stud (2-3/4 inch Bushing Shank Length), side mount

Frequently Asked Questions

What is the voltage rating of the K675TBC deadbreak bushing?

The ABB K675TBC deadbreak bushing has a voltage rating of 15/25kV.

What is the continuous current rating for this bushing?

The K675TBC deadbreak bushing is rated for 900 Amps of continuous current.

What materials is the K675TBC bushing constructed from?

The bushing is constructed from molded epoxy with a stainless steel flange.

What types of equipment is this bushing designed for?

This deadbreak bushing is designed for in-air applications on pad-mounted, vault-type, or submersible transformers and switchgear.

Does the K675TBC come with all necessary studs?

The K675TBC includes one factory-installed 5/8-11 UNC-2A stud. A second stud must be purchased separately.

What are the overall dimensions of the K675TBC bushing?

The K675TBC deadbreak bushing has an overall length of 13.75 inches and a diameter of 4.50 inches.

How to Weld ELASTIMOLD Apparatus Bushings and Bushing Wells

This guide provides recommended procedures and safety precautions for welding ELASTIMOLD apparatus bushings and bushing wells, focusing on minimizing heat to maintain product integrity.

Estimated time: 1h

Tools needed:

TIG welding equipment, MIG welding equipment, Thermocouple detectors, Copper heat sinks

Supplies needed:

No. 308 bare stainless steel wire, Thermally conductive paste, HV insulated caps or connectors, Cleaning agents

  1. Prepare Apparatus and Workspace

    DANGER: De-energize all apparatus before beginning. Inspect all parts for damage, proper rating, and compatibility. Ensure the installation area is clean and all required tools and supplies are at hand. Remove any protective shipping covers and replace them with appropriate HV insulated caps or connectors before energizing or submerging the circuit. Ensure the clearance between the epoxy shank and the mounting hole is 3/16” ± 1/16”. Remove all burrs from the mounting hole and finish with a 1/16” radius.

  2. Set Up Heat Sinks and Clean Surfaces

    Install copper heat sinks to minimize heat flow to the epoxy. Apply thermally conductive paste at the face of the heat sinks in contact with the flange and cover. Ensure venting is provided for the heat sinks. Position the bottom heat sink to be of larger diameter than the top. DANGER: Do not thread heat sinks to the bushing or bushing well stud. Thoroughly clean all surfaces (tank, bushing, and bushing well) to remove contamination like paint or grease, which can extend welding time and affect bushing integrity.

  3. Perform Welding with Heat Control

    Perform welding using either Inert-gas, tungsten-arc (TIG) or Short-arc (MIG) processes with No. 308 bare stainless steel wire. Keep heat to a minimum; the visible heat line should not be greater than 1/8” from the weld and 3/16” from the O.D. of the flange. Minimize air currents in the welding area. Use thermocouple detectors to ensure temperatures at critical points do not exceed 225°F. Minimize forces applied to the heated stud and flange during and after welding. If using non-water-cooled heat sinks, remove them promptly after welding and air cool the bushing.

  4. Final Checks and Curing

    Ensure the oil level covering the immersed stud connection is greater than 2 inches. If the equipment surface requires thermal baking to cure its finish, ensure the bake sequence does not exceed 130°F or 8 hours to prevent damage to the bushings. During this curing process, the bushing metallic contacts should not be mechanically loaded internally or externally to prevent epoxy distortion. IMPORTANT: ELASTIMOLD bushings are not designed for use in air, except for the 600T1 with boots and collars.

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