CBCT (Core Balance Current Transformer) Series
Reliable Earth Leakage Current Detection for ELR Systems
The HS Grup CBCT (Core Balance Current Transformer) Series is designed for accurate detection of residual and earth leakage currents when used together with Earth Leakage Relays (ELR). The toroidal and split-core CBCT models provide high sensitivity, excellent insulation performance, and reliable operation for industrial, commercial, and power distribution applications.
These current transformers continuously monitor the vector sum of all conductors passing through the core and generate a proportional signal to the connected earth leakage relay whenever leakage current occurs.
Key Features
- High-accuracy earth leakage current detection
- Compatible with HS Grup KAR-1 Earth Leakage Relay
- Toroidal and Split-Core models available
- Wide range of aperture sizes
- Suitable for new installations and retrofit projects
- High insulation strength
- Industrial-grade construction
- Easy installation and wiring
- Reliable operation in harsh environments
- DIN rail ELR compatibility
Applications
- Electrical Switchboards
- Motor Protection Systems
- Power Distribution Panels
- MCC Panels
- Generator Protection
- Transformer Protection
- Industrial Automation Systems
- Commercial Buildings
- Data Centers
- Renewable Energy Systems
- Solar Power Installations
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Core Balance Current Transformer (CBCT) |
| Frequency | 50/60 Hz |
| Operating Voltage | Up to 1000V |
| Turn Ratio | 1000/1 |
| Surge Voltage Resistance | 3 kV |
| Test Voltage | 3 kV AC, 1 Minute |
| Permissible Current | 20 kA / 1 Second |
| Insulation Resistance | DC 500V / 100 MΩ |
| Protection Class | IP20 |
| Operating Temperature | -45°C to +55°C |
| Ambient Temperature | -20°C to +55°C |
| Standards | IEC 60947-2, LV Directive 2014/35/EU, EMC Directive 2014/30/EU |
Toroidal CBCT Models
| Model | Inner Diameter | Rated Current |
|---|---|---|
| CBCT-1-25 | 25 mm | 63 A |
| CBCT-1-45 | 45 mm | 100 A |
| CBCT-1-80 | 80 mm | 400 A |
| CBCT-1-100 | 100 mm | 630 A |
| CBCT-1-150 | 150 mm | 1250 A |
| CBCT-1-210 | 210 mm | 2500 A |
| CBCT-1-310 | 310 mm | 3500 A |
Split-Core & Rectangular CBCT Models
KCBCT-1-36-10
- Opening Size: 360 × 100 mm
- Rated Current: 5000 A
- Type: Split Core
KCBCT-1-50-10
- Opening Size: 500 × 100 mm
- Rated Current: 5500 A
- Type: Rectangular Split Core
Ideal for retrofit installations where disconnecting existing conductors is difficult.
How CBCT Works
The CBCT monitors all phase conductors and neutral passing through its core. Under normal operating conditions, the sum of currents equals zero. When earth leakage occurs, an imbalance is detected and transmitted to the connected Earth Leakage Relay, which can then trigger an alarm or disconnect the circuit.
Installation Guidelines
- Pass all phase conductors and neutral through the CBCT.
- Do not pass the protective earth (PE) conductor through the CBCT.
- Ensure all conductors pass in the same direction.
- For cable lengths exceeding 1 meter between CBCT and ELR, use shielded or twisted-pair cable.
- Mount the CBCT securely to avoid vibration and conductor movement.
Compatible Products
The HS Grup CBCT Series is fully compatible with:
- KAR-1 Earth Leakage Relay
- Earth Leakage Protection Systems
- Residual Current Monitoring Systems
- Industrial Protection Panels
Advantages
✓ Fast and reliable leakage current detection
✓ Wide range of sizes for cables and busbars
✓ Suitable for retrofit and new installations
✓ Long service life
✓ High immunity to electrical noise
✓ Industrial-grade reliability
✓ Compliance with international standards
