Mechanical connectors with stepless screws
05 June 2026
CLAMPING WITH SCREWS WITHOUT BREAKING STEPS
Mechanical joint connectors and cable lugs are designed for the safe and reliable connection of copper and aluminium conductors in modern electricity generation, transformation and distribution systems.
The connection is made via mechanical clamping with stepless screws (without a predetermined breaking point), eliminating the need for crimping. The anti friction disc ensures reduced friction for greater contact force and prevents damage to the strands.
Optimal Breaking Torque
STEPLESS TECHNOLOGY
CEMBRE mechanical connectors feature stepless technology: the screws have no predetermined breaking point and ensure the optimal breaking torque is achieved, reducing installation errors and improving clamping quality.
CEMBRE screws also maintain traceability after breakage (batch number marked on the screw base), simplifying maintenance and ensuring compliance with standards.
Cable lugs allow a conductor to be connected to equipment such as busbars, switches or transformers.
- Cable cross section: 50–240 mm² (1- 1/10 AWG -500 MCM)
- Uniform clamping regardless of conductor type
- Tinned aluminium body with stepless screws and anti friction disc
- Removable centring rings for perfect alignment
- Performance certified by accredited laboratories in accordance with CEI EN 61238-1-3
Joints connect or extend two electrical cables.
- Cable cross section: 50–240 mm² (1-1/10 AWG - 500 MCM)
- Stable and uniform contact
- Transverse grooves for low resistance and long service life, breaking down aluminium oxides on the conductor
- Tinned aluminium body with stepless screws and anti friction disc
- Removable centring pins for perfect alignment
- Performance certified by accredited laboratories in accordance with CEI EN 61238-1-3
Mechanical connectors ensure quick, reliable and safe installation of medium voltage copper or aluminium cables. They offer:
- Easy installation: no crimping tools required — a hex socket spanner is sufficient
- Reduced installation errors: optimal breakaway torque guaranteed by stepless technology
- Versatility: one connector covers multiple conductor cross section
- Reliability and safety: high performance electrical contact even in harsh conditions
- Guaranteed traceability: markings remain visible after screw breakage
- Safer installation: removable centring devices and protective caps eliminate sharp edges
Mechanical clamping joints and cable lugs are used to connect aluminium and copper conductors, ensuring consistent performance and reducing the risk of loosening, overheating or galvanic corrosion. They are suitable for all medium voltage applications, including:
- Electricity distribution networks
- Traditional and renewable power plants
- Data centres
- Electrical transformer substations
- Power supply systems for industrial processes
- Medium voltage splice and termination kits
CEMBRE mechanical connectors feature an aluminium body. Aluminium is ideal for medium voltage applications due to:
- Low weight for easier transport and installation
- Good electrical conductivity
- Compatibility with all conductor types
- High corrosion resistance
- Long term reliability, even in harsh environments
Mechanical clamping connectors are certified by laboratories accredited to CEI EN 61238 1 3, the international standard defining test and performance requirements for electrical connectors for power cables, including joints and cable lugs.
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