Isoflexx® laminated busbars

Isoflexx® laminated busbars made of Cu-ETP are very flexible and permanently protected by high-quality insulation.

Up to 1 0 mm²
2 0 mm
Standard length
0.5 - 0 mm
Lamella thickness

Areas of application for Isoflexx® laminated busbars

Isoflexx® laminated busbars made of copper can be used for all electrical connections in control cabinets and in low-voltage installations.

Whether as a movable component within solid busbar systems, for connection to generators, transformers, switchgear and switching devices, as a supply line to machine switches, and immersion baths or as a riser in switchgear – Isoflexx® busbars are innovative and cost-effective connections.

The loose lamellae in the insulation allow for easy bending or twisting and thus offer excellent flexibility when installing the busbars. Isoflexx® copper busbars are also suitable for drilling or punching.

SPS Isoflexx Classic versinnt konfektioniert

With the same load capacity
the conductor cross-section of
Isoflexx® compared to cables
up to 40 % smaller than cables
and thus allows for smaller
bending radii.

Flexible working

The flexibility allows the
compensation of construction
tolerances during installation
and the assembly time is
drastically reduced.


The smaller conductor cross-section
with Isoflexx® compared to cables
with the same current carrying
capacity reduces material consumption.


Choose between our standard
colours or personalise your
Isoflexx® and your control
cabinet systems gain in clarity
and safety.


Isoflexx® has reinforced
edges, uniform insulation
and are extremely heat
resistant. The dielectric
strength is tested.

Certifications Isoflexx®

SPS Standard Produkte Schwanenmühle GmbH is certified according to DIN EN ISO 9001.

UL 758 (Classic)
UL 508 (Classic & Premium)
DIN EN 45545-2/R22/23HL3 (Rail)

IEC 61439-1 

Conductor material Isoflexx®

  • Cross-sections from 21.6 to 1200 mm²
  • Standard length 2000 mm
  • Lengths from 250 to 3000 mm on request
  • Copper lamellae made of highly conductive Cu-ETP
  • Tensile strength 200 MPa [R200]
  • Electrical conductivity 58 MS/m
  • Isoflexx® from 0.5 mm - 1.0 mm lamella thickness
  • Cu-ETP blank
  • Cu-ETP tinned (corrosion resistant)

Insulation variants of Isoflexx®

Our Isoflexx® Classic and Isoflexx® Premium (105-190 °C) allow higher temperatures than PVC or XLPE cables (70-90 °C). This means that a significantly higher current-carrying capacity can be achieved.

Isoflexx® insulation is resistant and has reinforced edges to withstand high operating voltages. The homogeneous, stress-free insulation prevents cracking at edges. Isoflexx® busbar insulation is available in various colours and complies with the RoHS directive.

Product Isoflexx® Classic Isoflexx® Premium Isoflexx® Rail
Colors insulation Black, Blue, Green+Yellow Grey Black
Thickness [mm] ≥ 1 ≥ 2 ≥ 1,5
Dielectric strength 20 kV/mm 16 kV/mm 21 kV/mm
Elongation 370 % 180 % 550 %
Operating temperature -40 °C / +105 °C -40 °C / +190 °C -40 °C / +105 °C
Operating voltage 1000 VAC/1500 VDC (UL 600 VAC/750 VDC) 1000 VAC/1500 VDC (UL 600 VAC/750 VDC) 1000 VAC/1500 VDC
Flammability UL 94 V0 UL 94 V0 UL 94 V0
Glow wire test 960°C 960°C 960°C
Material Special PVC, Self-extinguishing, Migration resistant, Compatible with various construction materials Silicone, Halogen free, Self-extinguishing Thermoplastic elastomer (TPE), Halogen free, Insulation fulfills flame protection requirements for railroad applications
Approvals UL 758, UL 508 UL 508 UL 94 V-0 (1.5 mm), DIN EN 45545-2 R22 HL2, DIN EN 45545-2 R23 HL3

Isoflexx® Classic

The special PVC insulation of Isoflexx® Classic is naturally self-extinguishing and is often used in industrial applications.

The plasticiser is migration resistant and compatible with construction materials such as polycarbonate and polymethyl methacrylate.

UL 758, UL 508

RoHS, CE, REACH, IEC 61439-1

SPS Isoflexx Classic verzinnt
Halogenfreie Silikon-Isolierung Isoflexx® Premium

Isoflexx® Premium

The halogen-free silicone insulation of Isoflexx® Premium is self-extinguishing, produces only a very small amount of toxic smoke in case of fire and is therefore often used in public buildings. 

The insulation tube is a homogeneous profile which is pulled over the conductor material. 

UL 508

RoHS, CE, REACH, IEC 61439-1

Isoflexx® Rail

Isoflexx® Rail’s halogen-free TPE insulation generates only a very small amount of toxic smoke in the event of fire and can therefore also be used in public facilities. 

Isoflexx® Rail insulation also fulfills the flame protection requirements for rail applications – for greater safety for people and railroads.

UL 94 V-0 (1,5 mm), DIN EN 45545-2 R22 HL2 (insulation), DIN EN 45545-2 R23 HL3 (insulation)

RoHS, CE, REACH, IEC 61439-1

Isoflexx Classic lamellierte Kupferschiene verzinnt

Assembly & processing of Isoflexx®

Assembly & processing of Isoflexx®

For Isoflexx® copper busbars, the current carrying capacity applies according to the following table determined according to IEC or UL standard:

Assembly instructions Isoflexx®

The following standards should be considered for bolting Isoflexx® busbars:

  • DIN 43671 & 43670 Busbars with rectangular cross-section.
  • DIN 43673 Currents for busbars – drilling and screwing

Isoflexx® connections can be easily made by yourself with the right tools & accessories. By stripping the ends,

Isoflexx® offers more safety in your installations, because you do not need cable lugs. The connections must be stripped by yourself.

Treatment of the contact surfaces
The surfaces should be even, but not polished. The contact resistance is lower if the contact surfaces have a medium roughness (RA 1.6-3.2). Contact surfaces should be free of oxide and grease. If this is not the case, the contact surfaces must be cleaned.

Possible SPS assembly

SPS Stern