
Clamp / Split-Core Current Transformer LMCK-50 • 800/5A • Accuracy Class 0.5
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Product Description
Overview
The LMCK-50 800/5A Accuracy Class 0.5 is a split-core (clamp-on) current transformer designed for accurate measurement of high AC currents without interrupting the primary circuit. With a primary rating of 800 A and secondary output of 5 A, and an error tolerance of ±0.5% under rated conditions, it suits precision metering and monitoring in demanding industrial, commercial or high-load applications.
Key Features
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Model / Series: LMCK-50 (Zhikai) – part of the split-core current transformer family.
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Primary Rating: 800 A AC
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Secondary Rating: 5 A AC
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Accuracy Class: 0.5 (i.e., ±0.5%) — good for precision metering applications where lower error is required.
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Window / Inner Hole Size: ~50 mm (inner diameter), matching LMCK-50 family which supports up to 50mm hole size.
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Housing: Flame-retardant plastic enclosure, moisture-protected, stable performance, minimal maintenance.
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Clamp / Split-Core Design: Self locking clamp mechanism, allowing for easy installation / retrofit without disconnecting the primary conductor.
Technical Specifications (As Expected / Typical)
Specification | Detail / Expected Value |
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Primary current rating (In) | 800 A AC |
Secondary current rating (Is) | 5 A AC |
Transformation ratio | 800 : 5 |
Accuracy class | 0.5 (±0.5%) at rated current |
Inner diameter / window size | ~50 mm |
Rated frequency | 50/60 Hz (confirm supplier spec) |
Housing material | Flame retardant plastic; inert, moisture-protected |
Burden (maximum VA load of secondary) | To be confirmed with datasheet — typical CT load specs needed |
Operating temperature / environmental limits | Supplier-specified; likely standard industrial ambient (e.g. -20°C to +60°C) |
Safety / Insulation | Plastic enclosure; secondary winding must not be open when primary is energized; isolation meets UL94-V0 for plastic case. |
Applications
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High current load monitoring in industrial switchboards or distribution panels
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Precision energy metering, auditing and power quality applications
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Integration with power analyzers, PLCs, SCADA or building management systems
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Use where the primary cable/conductor cannot be disconnected (retrofit)
Installation & Safety Notes
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Ensure the conductor or busbar fits through the ~50 mm opening without strain, deformation, or damage to the conductor insulation.
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The secondary circuit must always be terminated (connected to the measuring device or burden resistor); never leave the secondary circuit open while the primary is carrying current.
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Secure the clamp fully, ensure mechanical integrity, avoid mechanical vibration affecting readings.
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Avoid placing the CT in proximity of strong external magnetic fields that could distort readings.
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Follow local electrical codes for grounding, insulation, enclosure, etc.
Benefits
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±0.5% accuracy gives high fidelity in measurements—good for billing, precision energy monitoring
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Large aperture (~50 mm) allows for large conductors or busbars
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Clamp-on installation means easier, safer retrofitting without interrupting operations
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Durable construction (plastic, moisture protection) means lower maintenance
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