Heat Shrink Busbar Sleeve - Heavy Wall up to 36 kV (GHB)

About Heat Shrink Busbar Sleeve - Heavy Wall up to 36 kV (GHB)

The heavy-wall grade of Gala's BUSSLEEVE range (GHB series) is meant for the higher end of medium-voltage switchgear, up to 36 kV. Its recovered wall of 3.2 to 3.8 mm gives a thicker insulating jacket than the medium-wall GMB grade, for panels and bus ducts at 33 kV and similar ratings.

Like the rest of the range, it is a cross-linked polyolefin tube supplied expanded. Heated on a copper or aluminium bar, it shrinks into a close, continuous cover that follows straight and bent bars without creasing. Insulated bars are protected against accidental flash-over and against corrosion by acid, alkali and salt, allow switchgear designers to work with reduced clearances, and solve insulation problems between closely spaced bars in bus ducts.

Thirteen sizes cover rectangular bars from 20 to 314 mm (width plus thickness) and round bars from 13 to 200 mm. Sizes up to GHB 65/25 come on 25 m reels, mid sizes on 20 m or 15 m reels, and the two largest in 1.5 m lengths. Pick the size whose W+B range contains the bar's width plus thickness.

Fitting is by torch or oven. With a torch, preheat the bar, slide the sleeve into place and shrink it from one end. In an air-circulating oven, 120 to 150 deg C for an average of 10 to 15 minutes is typical, never under 5. Use a thin film of approved lubricant on bent bars. Trim ends and punch holes after cooling.

Gala holds a POWERGRID manufacturer approval covering insulation sleeves and tapes, valid to February 2028.

Manufactured by Gala in India. Datasheet and size selection on request.

Specifications

• Brand: Gala
• Product type: Heavy wall heat shrink busbar sleeve
• Material: Cross-linked polyolefin
• Colour: Brick red
• Voltage rating: Up to 36 kV
• Operating temperature: -40 deg C to +115 deg C continuous (Aug 2026 catalogue)
• Size range: GHB 25/8 to GHB 250/120; rectangular bar W+B 20 to 314 mm; round bar 13 to 200 mm
• Wall type / thickness: Heavy wall, 3.20 mm to 3.80 mm after recovery (+5% / -2%)
• Standards tested to: Test methods quoted on GSF's catalogue - ASTM D638, ASTM D570, ASTM D792, ASTM D2240, ASTM D2671, ASTM D257, ASTM D150
• Application: Insulation of busbars in MV switchgear and bus ducts up to 36 kV
• Installation: Torch (preheat bar, shrink from one end) or air-circulating oven at 120 to 150 deg C for 10 to 15 minutes
• Country of origin: India
• Shrink temperature: 125 deg C
• Tensile strength: 9 N/mm2 min
• Elongation at break: 350% min
• Density: 1.20 +/- 0.2 g/cm3
• Hardness: 45 +/- 10 Shore D
• Water absorption: 0.5% max
• Heat shock: 250 deg C for 30 min, no cracking or flowing
• Low temperature flexibility: -40 deg C for 4 h, no cracking
• Volume resistivity: 1 x 1013 ohm.cm min (ASTM D257)
• Dielectric constant: 5 max
• Approval: POWERGRID manufacturer approval for insulation sleeves and tapes, valid to 17 Feb 2028
• Packing: Reels of 25 m, 20 m or 15 m; 1.5 m lengths for GHB 205/85 and GHB 250/120

Sizes

• GHB 25/8 | D 25 / d 8 | T 3.20 | 25 m | rect W+B 20-28 | round 13-20
• GHB 30/12 | D 30 / d 12 | T 3.50 | 25 m | rect 28-33 | round 18-25
• GHB 40/16 | D 40 / d 16 | T 3.50 | 25 m | rect 35-45 | round 22-32
• GHB 50/20 | D 50 / d 20 | T 3.50 | 25 m | rect 45-54 | round 29-40
• GHB 65/25 | D 65 / d 25 | T 3.50 | 25 m | rect 50-62 | round 32-43
• GHB 75/28 | D 75 / d 28 | T 3.50 | 20 m | rect 53-69 | round 34-47
• GHB 85/32 | D 85 / d 32 | T 3.50 | 20 m | rect 69-100 | round 44-68
• GHB 100/38 | D 100 / d 38 | T 3.70 | 20 m | rect 83-102 | round 53-72
• GHB 120/45 | D 120 / d 45 | T 3.70 | 20 m | rect 94-125 | round 60-85
• GHB 150/60 | D 150 / d 60 | T 3.70 | 15 m | rect 122-168 | round 78-105
• GHB 180/70 | D 180 / d 70 | T 3.70 | 15 m | rect 160-196 | round 102-125
• GHB 205/85 | D 205 / d 85 | T 3.70 | 1.5 m length | rect 239-250 | round 152-164
• GHB 250/120 | D 250 / d 120 | T 3.80 | 1.5 m length | rect 264-314 | round 168-200

Applications: MV switchgear manufacturers (33 kV class), bus duct makers, substations, power utilities, panel builders, industrial and infrastructure electrical contractors