
LMHK-58 (50×80 mm Window) Clamp / Split-Core Current Transformer • 1600/5A • Accuracy Class 0.5
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Product Description
Overview
The LMHK-58 (50×80 mm) 1600/5A Accuracy Class 0.5 current transformer is a precision, open/clamp-on (split‐core) transformer designed for monitoring high currents in power systems. With a large aperture of approx. 50×80 mm, and a ratio of 1600 A primary to 5 A secondary, it delivers accurate measurement (±0.5%) suitable for demanding metering, protection, or power monitoring tasks.
Key Features
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Model / Series: HK-58 (LMHK-58) split-core type with clamp/open design
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Primary Current Rating: 1600 A AC
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Secondary Current Rating: 5 A AC
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Accuracy Class: 0.5 (±0.5%) under rated load, for precision metering tasks
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Window / Aperture Size: Approx. 50×80 mm to accommodate large conductors or busbars
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Type: Split-core, clamp/open style – allows installation without disconnecting the primary conductor
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Housing Material: Flame retardant plastic case, moisture resistant; built for stable performance in harsh industrial settings
Technical Specifications (Typical / Expected)
Specification | Detail / Expected Value |
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Ratio (Primary : Secondary) | 1600 : 5 A |
Accuracy Class | 0.5 (±0.5%) |
Aperture / Window Size | ~ 50×80 mm (busbar / cable space) |
Rated Frequency | 50-60 Hz (usually) |
Burden / Secondary Load | Typical VA rating for HK-58 at 1600/5A, class 0.5 often ~10 VA — check datasheet |
Operating Temperature | Approx. -25 °C to +75 °C, industrial rating |
Insulation / Dielectric Strength | Usually meets standards (PC/UL94-V0 case, insulation resistance, etc.) |
Mechanical Type | Clamp / split core with self-locking mechanism, large window for bus-bars or thick conductors |
Applications
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Industrial / commercial power metering, energy management systems
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Monitoring high-load circuits: large motors, transformer feeders, busbars
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Protection systems where accurate current measurement is required
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Retrofit applications: open design allows installation without circuit interruption
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Integration with power analyzers, SCADA, building management systems
Installation & Safety Instructions
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Ensure the conductor or busbar to be measured fits nicely through the 50×80 mm opening, without strain or deformation.
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Never leave the secondary open when the primary is energized — always connect a proper measurement device or load (meter / burden) to avoid dangerous voltages.
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Secure the clamp fully; ensure locking mechanism engaged, stable mounting.
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Avoid placing near strong external magnetic fields or in environments above the maximum rated temperature / moisture.
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Comply with local electrical standards and safety codes.
Benefits
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High accuracy (0.5%) improves measurement reliability, especially for billing, power quality, audits.
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Large aperture allows for thick cables or busbars without requiring modifications.
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Split-core/clamp design easing installation and reducing system downtime.
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Durable materials and housing reduce maintenance and prolong lifespan.
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