Relay
High-Performance Core Balance Current Transformers (CBCT) for Earth Fault 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.
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Ensures that in normal conditions, the sum of phase currents remains zero with no output from the CBCT.
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Detects any deviation from zero current caused by leakage or fault conditions.
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Measures the residual current generated due to imbalance in the system.
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Identifies earth faults or current leakage to enable timely protection. Induction Sensing –
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Operates on electromagnetic induction to detect current variations via the CBCT.
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Automatically activates the protection relay to isolate the faulty circuit.
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.
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25mA – 30A
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65A to 400A
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1/1000, 1/600 (custom ratios available upon request).
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50–60 Hz
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720V AC
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25mm, 35mm, 50mm, 70mm, 95mm, 120mm, 210mm, 240mm, 310mm, 400mm, 500mm.
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Core only or copper wound.
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Provides reliable earth fault protection in low and medium voltage distribution networks.
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Ensures safe operation of automated systems by detecting leakage currents in machinery.
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Monitors and protects electrical panels and switchgear from ground fault conditions.
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Enhances safety in solar and other renewable installations by identifying fault currents.
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Supports safe EV charging operations through effective leakage current detection.
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Protects critical electrical devices by continuously monitoring for ground faults.
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Built using high-performance nanocrystalline cores for superior magnetic properties and efficiency.
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Minimizes eddy current and core losses, improving overall energy efficiency.
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Delivers enhanced sensitivity for accurate detection of even small leakage currents.
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Offers a space-saving footprint, ideal for modern electrical panels and systems.
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)
Reliable Auxiliary Relay Components for Precision and Control
ELCB relay assemblies provide reliable earth leakage protection by detecting fault currents and ensuring rapid circuit disconnection.
Reliable Auxiliary Relay Components for Precision and Control
ELCB relay assemblies provide reliable earth leakage protection by detecting fault currents and ensuring rapid circuit disconnection.
Pioneering cutting-edge technology to develop reliable, high-performance magnetic components and engineering solutions.
