Relay
CBCT Assembly
High-Performance Core Balance Current Transformers (CBCT) for Earth Fault Protection
High Precision CBCT Assemblies for Electrical Protection
High-accuracy CBCT assemblies designed for reliable leakage detection and stable performance across protection systems. Engineered for consistency, sensitivity, and long-term durability in critical applications.
Key Features
1
Current Balance
Ensures that in normal conditions, the sum of phase currents remains zero with no output from the CBCT.
2
Imbalance Sensing
Detects any deviation from zero current caused by leakage or fault conditions.
3
Residual Measurement
Measures the residual current generated due to imbalance in the system.
4
Leakage Detection
Identifies earth faults or current leakage to enable timely protection. Induction Sensing –
5
Induction Sensing
Operates on electromagnetic induction to detect current variations via the CBCT.
6
Relay Triggering
Automatically activates the protection relay to isolate the faulty circuit.
Reliable CBCT Assemblies for Earth Fault Protection
Permanent Magnets Limited (PML) offers high-performance CBCT assemblies, also known as Zero Sequence Current Transformers (ZSCT), for accurate fault detection in low and medium voltage systems. Designed in ring or rectangular forms, they enable easy installation around three-phase conductors. These assemblies detect residual currents during earth faults and trigger protection relays instantly. Built for reliability, they enhance system safety and prevent electrical hazards.
Technical Specifications
1
Operating Current Range
25mA – 30A
2
Rated Operational Current
65A to 400A
3
Current Ratios
1/1000, 1/600 (custom ratios available upon request).
4
Operating Frequency
50–60 Hz
5
Maximum System Voltage
720V AC
6
Inner Diameter Options (to accommodate cable size)
25mm, 35mm, 50mm, 70mm, 95mm, 120mm, 210mm, 240mm, 310mm, 400mm, 500mm.
7
Construction Format
Core only or copper wound.
Applications
1
Power Distribution
Provides reliable earth fault protection in low and medium voltage distribution networks.
2
Industrial Automation
Ensures safe operation of automated systems by detecting leakage currents in machinery.
3
Switchgear Panels
Monitors and protects electrical panels and switchgear from ground fault conditions.
4
Renewable Systems
Enhances safety in solar and other renewable installations by identifying fault currents.
5
EV Infrastructure
Supports safe EV charging operations through effective leakage current detection.
6
Sensitive Equipment
Protects critical electrical devices by continuously monitoring for ground faults.
Material Advantage
1
Nano Core
Built using high-performance nanocrystalline cores for superior magnetic properties and efficiency.
2
Low Loss
Minimizes eddy current and core losses, improving overall energy efficiency.
3
High Sensitivity
Delivers enhanced sensitivity for accurate detection of even small leakage currents.
4
Compact Design
Offers a space-saving footprint, ideal for modern electrical panels and systems.
Trust Reliability & Quality
With over 65 years of manufacturing excellence, PML delivers CBCT Assembly trusted by OEMs and Tier 1 suppliers across sectors demanding robust performance.
ISO 45001
Occupational Health and Safety (OH&S) management systems
ISO 14001
Environmental Management Systems (EMS)
ISO 9001
Quality Management Systems (QMS)
IATF 16949
International Standard for Automotive Management Systems
AS 9100
Aerospace Quality Management System (QMS)
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