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Termate’s electrical busbar bushings provide a safe and tested way to pass conductors through enclosure walls while maintaining full compliance with IEC 61439-2.

Used across power distribution, data centres, rail, and energy storage, they help panel builders achieve correct functional unit separation and consistent insulation performance.

Designed, moulded, and tested in-house, every Termate bushing delivers proven electrical, mechanical, and thermal reliability to ensure your assemblies pass verification the first time.

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Internal B4

IP55 Rated Busbar Bushing

Need a bespoke solution?

Our compression & injection moulding expertise allows us to design & manufacture tailored components to your specification.

Internal B4 Bushings

Built for internal enclosure separation under IEC 61439-2, the B4 range supports Form 2, 3, and 4 assemblies.

Available in B4-30 and B4-50 sizes, they suit conductors from 20 × 3 mm to 50 × 10 mm.

Optional PVC cable boots enable safe integration in Form 4 Type 5 configurations.

IP55 Rated Bushings

Designed for harsh or outdoor environments, including Battery Energy Storage Systems (BESS).

These IP55-rated bushings feature a standardised frame with interchangeable adapter plates for flexible installation.

Tested to UL 9450 section 13 and IEC 62933-5-1, they provide sealed, reliable conductor entry up to 1000 V AC or 1500 V DC.

Technical Information for 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

  • Outer Frame and Adapter Plates Material: Glass Reinforced Polyamide 6.6
  • Gasket Material: Silicone Rubber 2mm kSil V-0 E235077
  • Operating temperature range from −40 °C to +130 °C (−40 °F to +266 °F)
  • IP55 – IEC 60529
  • Conductor not provided.

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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