Products / Separable Connector
CB Series
NKT CB Series Asymmetrical T-Connectors
When an asymmetric elbow/T-type separable connector is needed across a wide current range (630 A up to 1250 A) for polymeric or XLPE-insulated MV cables up to 42 kV, the NKT CB Series is what we specify. Five models cover 25 mm² up to 1200 mm² conductors, with both onshore and offshore variants available.
About this product
The NKT CB Series are asymmetric elbow-branch / T-type screened separable connectors used to terminate polymeric or XLPE-insulated medium-voltage cables onto Interface C bushings (per EN 50180 / EN 50181) in switchgear, transformers, and other MV equipment rated up to 42 kV. Unlike a single family-wide current rating, each CB model carries its own continuous current rating: 630 A on CB 24-630 and CB 36-630, and 1250 A on CB 24-1250/2, CB 36-630 (1250), and CB 42-1250/3. Note that a model's compatibility with a C2-class (1250 A) bushing does not raise its own continuous current rating: CB 24-630 and CB 36-630 are both rated 630 A regardless of which bushing class they're paired with. Conductor cross-section ranges from 25 mm² on the smallest model (CB 24-630) up to 1200 mm² on the largest (CB 42-1250/3), with cable insulation diameters spanning 12.7–57.8 mm across the range. The body uses silicone rubber rather than EPDM, and accepts either screwed/shear-head mechanical lugs or hexagonal compression lugs depending on variant. All models include a capacitive voltage measurement point and support cable outer-sheath testing without removing the connector. Depending on model, the range covers both onshore and offshore installation environments.
Technical Specifications
| connector geometry | Asymmetric elbow branch / T-type screened connector |
| bushing interface | EN 50180 / EN 50181, Interface C1 and C2 |
| max system voltage | 42 kV |
| Rated Continuous Current | 630 A or 1250 A, depending on model |
| conductor cross section | 25–1200 mm², depending on model, voltage, and conductor construction |
| cable insulation diameter | 12.7–57.8 mm |
| conductor material | Aluminium or copper |
| compatible cable type | Polymeric/XLPE-insulated single- or three-core MV cables; EPR on some models |
| Insulation Material | Silicone rubber |
| conductor connection method | Screwed/shear-head mechanical lug or hexagonal compression lug |
| test measurement features | Capacitive voltage measurement point and cable outer-sheath test without removing the connector |
| LPVT / Sensor Integration | Compatible with dedicated rear-port voltage sensors or LPVT solutions, subject to connector model and interface verification |
| installation environment | Indoor and outdoor; onshore and offshore applications depending on model |
Ordering Options
| Article Code | System Voltage (kV) | Continuous Current (A) | Insulation Diameter (mm) | Conductor Cross-Section (mm²) | Notes |
|---|---|---|---|---|---|
| CB 24-630 | 24 kV | 630 A | 12.7–34.6 mm | 25–300 mm² | |
| CB 24-1250/2 | 24 kV | 1250 A | 21.2–40.0 mm | 95–500 mm² | |
| CB 36-630 | 42 kV | 630 A | 17.0–44.0 mm | 25–400 mm² | |
| CB 36-630 (1250) | 42 kV | 1250 A | 28.9–51.0 mm | 150–800 mm² | |
| CB 42-1250/3 | 42 kV | 1250 A | 21.2–57.8 mm | 50–1200 mm² |
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