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Termate’s B4 busbar bushings provide a reliable, standards-compliant method of passing conductors through enclosure walls while maintaining internal separation in Form 2, 3, and 4 assemblies under IEC 61439-2.

Available in two versions – B4-30 and B4-50 – the range covers conductor sizes from 20 × 3 mm to 50 × 10 mm.

Manufactured from glass-reinforced polyamide 6.6, the bushings combine electrical insulation, mechanical stability, and thermal endurance up to 140 °C continuous operation.

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Key Features

  • Standards compliance: IEC 61439-2, thermal class F (IEC 60085)
  • Voltage rating: up to 690 V AC / 690 V DC
  • Impulse voltage: 8 kV
  • Continuous conductor temp: 140 °C (max. 145 °C)
  • Material: Glass-reinforced polyamide 6.6
  • Flammability: UL 94 V-0, glow wire 960 °C
  • Sizes: B4-30 and B4-50

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Technical Information for Internal B4 Busbar Bushings

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You will find useful technical information below but, if you have any questions, please contact our technical team for support.

Part Number3D ModelConductor Sizes (mm)Ue (AC/DC)Ui (AC/DC)Uimp
B4-30B4-30 STEP file20×3, 20×4, 30×5, 30×10690 V690 V8 kV
B4-50B4-50 STEP file25×5, 20×10, 40×10, 50×10500 V500 V8 kV

B4-30

3D Render of Termate's FB

B4-50

3D Render of Termate's

B4-50

3D Render of Termate's

  • Material: Glass Reinforced Polyamide 6.6
  • Conductor Temp.: 140 °C†
  • Flammability: UL 94 V-0
  • Glow Wire: 960 °C

† In line with the limits set out in IEC 61439, insulating components in contact with conductors may be required to continuously operate at an average of 140 °C (max. 145 °C).

This range of products meets the requirement, the material for them being assigned thermal class F established using methods similar to IEC 60085

Part Number3D ModelDescriptionMax. Cable Size (mm²)
B4-30BOOTB4-30BOOT STEP fileAngled Boot for B4-301×300
2×240
B4-30S-BOOTB4-30S-BOOT STEP fileStraight Boot for B4-301×300
B4-50BOOTB4-50BOOT STEP fileAngled Boot for B4-501×500
2×300

Boot Properties

  • Boot Material: Black PVC
  • Operating Temp.: Max. 90 °C continuous
  • Flammability: UL 94 V-0
  • Glow Wire: 650 °C

B4-30Boot

3D rendering and diagram showing the dimensions of the B4-30 Boot Bushing

B4-30S-Boot

3D rendering and diagram showing the dimensions of the B4-30S Boot Bushing

B4-50BOOT

3D rendering and diagram showing the dimensions of the B4-50 Boot Bushing

B4-30 Bushing 20
Diagram B4-30 Bushing with a 20×4 mm Conductor
Diagram B4-30 Bushing with a 20×5 mm Conductor
Diagram B4-30 Bushing with a 30×10mm Conductor
Diagram to show the rotation of the B4-30 Bushing to suit application
Diagram showing the dimensions of the B4-30 Bushing
Diagram showing the side view of the B4-30 Bushing

Diagram B4-50 Bushing with a 25×5mm Conductor
Diagram B4-50 Bushing with a 20×10mm Conductor
Diagram B4-50 Bushing with a 40×10 mm Conductor
Diagram B4-50 Bushing with a 50×10 mm Conductor
Diagram to show rotation of the B4-50 Bushing to suit application
Diagram to show rotation of the B4-50 Bushing to suit application
Diagram to show side dimensions of the B4-50 Bushing

B4-30 Bushings - Punching Details

B4-30 Bushing; Fixing/Punching details

B4-50 Bushings - Punching Details

B4-50 Punching/Fixing Details, showing 4

Termate is committed to the highest standard of customer focus and we have made every effort to maintain the accuracy and completeness of the information provided in this data.

Where improvements to our products affect their installation and usage we endeavour to contact any customers who may be affected.

Warranty as stated in our Terms and Conditions of Trading is void if any modification is made to the warranted product.

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