Pfisterer CONNEX Connectors (MV-HV Inner Cone Plugs & Cable Terminations)

Pfisterer CONNEX Cable Plugs | Medium High Voltage Cables

Pfisterer CONNEX Cable Plugs | Medium & High Voltage Cables 33kV 52kV

Thorne & Derrick | Distributed from Stock | Approved Supplier | UK & Export Sales

Thorne & Derrick stock and distribute Pfisterer CONNEX Connectors for medium and high voltage cable connection and termination of cables to electrical systems – we provide competitive prices for Pfisterer CONNEX connectors used to terminate polymeric insulated MV-HV cables into gas insulated switchgear and electrical equipment bushings from extensive stocks to UK and international destinations.

CONNEX Connectors

Pfisterer MV CONNEX cable connectors are specified to terminate medium/high voltage cables into gas insulated switchgear, RMU ring main units, transformers, transducers and capacitors typically distributing 33kV/52kV electricity – depending on MV bushings a range of sizes are available to terminate polymeric cables into inner cone equipment bushings with XLPE/EPR insulation, bonded or easy strip semicon, copper wire/tape screen and with or without armour.

Cable Connectors Overview 

Cable Fittings for Medium Voltage Networks up to 66kV

CONNEX from Pfisterer meets all performance requirements for a universal system of separable connectors: fully insulated with metal housing and providing touch-proof properties – maintenance-free, suitable for outdoor use and waterproof. This means MV-CONNEX can be used even in the most extreme conditions including offshore wind energy sector – the Medium Voltage Cable Components product range includes traditional plug and socket combinations, multiple sockets, bus-bar connectors, surge arresters and voltage detecting systems to enable the installation, maintenance and commissioning of both onshore and offshore substation switchgear and transformers.

Pfisterer Connex Connectors

Pfisterer CONNEX Connectors | MV Connection System for Cables, Transformers and GIS


Stockists & Suppliers | Pfisterer CONNEX

CONNEX Benefits 

  • 75% time saving by the cable jointer for the first installation
  • Compact design for confined spaces and electrical equipment
  • Suitable for onshore and offshore indoor/outdoor substations
  • Quick change of location as a replacement transformer
  • Flexible conversion of medium voltage transformers
  • Touch-safe maintenance of MV electrical equipment
  • High protection against electromagnetic fields
  • Cable connectors certified for offshore applications
  • Tested safety according to IEC Standards
  • Support Services | Training Installation Courses
  • Standard & Custom Connectors | Enquiry Form
  • Supporting MV Products | Test Leads Dummy Plugs Earth Caps & Earthing/Current Testing

MV Cable Accessories for
Global Onshore and Offshore Substations | we can deliver from stock to UK and international projects.


CONNEX | Certified for offshore wind energy applications by the classification society DNV GL for the connection and termination of medium/high voltage power cables. Image DNV GL.

MV-CONNEX Technical data & Size classification list

Medium Voltage Cable Termination Connectors up to 52kV

The following table provides a specification overview of CONNEX connectors, manufactured by Pfisterer, to suit electrical equipment bushing sizes 0, 1, 2, 3 & 3S on medium/high voltage (MV HV) gas insulated switchgear and substation applications.

Should you require any selection support to enable the correct specification of MV HV Cable Accessories, including CONNEX type connectors please do not hesitate to contact us.

Bushing Size 0 1 2 3 3-S
Max. operating voltage Um kV 24kV 36kV 42kV 42kV 52kV
Rated voltage U kV 20kV 30kV 36kV 36kV 45kV
Phase-to-earth voltage U0 kV 12kV 18kV 20.8kV 20.8kV 26kV
Nominal current IN A 250 Amps 630 Amps 800 Amps 1250 Amps 1250 Amps
Conductor round stranded solid flexible stranded solid flexible stranded solid flexible stranded solid flexible stranded solid flexible
Cross-section ) (reference value) Min. sqmm 25 35 16 25 70 16 25 70 16 35 95 25 35 95 25
Max. sqmm 70 70 50 240 240 185 400 325 240 800 1000 400 800 1000 400
3)Diameter*(design specification) Min. [mm] 5.6 5.6 5.6 4.9 8.3 6.5 4.9 8.3 6.5 6.1 10.5 6.5 17.5 10.5 6.5
Max. [mm] 11.9 11.9 11.9 20.1 20.1 18.3 24.1 22.0 20.6 36.0 36.0 26.8 36.0 36.0 26.8
Voltage tap w/o with*1) w/o .1) th       / w/ow i w/o (XL) with*1) / w/o w/o (XL) with*1) / w/o w/o (XL)
Diameter over insulation*3) after removing of the semi-conductive cable screen Min. [mm] 12.7 13.5 13.5 13.5 36.0 15.5 46.0 15.5 46.0
Max. [mm] 23.5 31.5 36.0 36.0 44.0 46.0 55.0 46.0 55.0
Rated power withstand voltage 1min [kV] 54 81 95 95 117
Partial discharges at 2 x UO [pC] ≤ 10 ≤ 10 ≤ 10 ≤ 10 ≤ 10
Rated lightning impulse 1,2/50 ìs [kV] 125 170 200 200 250
D.C. voltage test 15min. [kV] 72 108 125 125 156
Rated short-time withstand current           1s
[kA] 16
Rated impulse current [kA] 40 125 125 150 150

*1) Earth the voltage tap test lead separately if it is not needed
*2) The range of the cross section is only valid if min. resp. max. diameter over conductor and min. resp. max. diameter over cable insulation are in the specified range
*3) The total range of cable connectors is covered by several CONNEX components

Pfisterer CONNEX Connectors

CONNEX Connectors | High Voltage Substations & Gas Insulated Switchgear

CONNEX | specified by UK Network Rail (PADS Approved) and international rail electrification projects for medium voltage power and distribution systems.

CONNEX | specified by UK Network Rail (PADS Approved) and international rail electrification projects for medium voltage power and distribution systems.

 ➡ Should you require customer service or technical support please contact us – view the full range of Pfisterer CONNEX Connectors below.

Cable Jointing Tools

MV Cable Preparation | From stock and approved by Pfisterer for the installation of CONNEX connectors we distribute the most extensive range of Cable Jointing Tools for the preparation of medium voltage polymeric cables up to 66kV.

Data Sheets