Nahu Group (NAHU Electric Technology) manufactures the full range of medium-voltage metering equipment: Current Transformers (CTs), Voltage Transformers (VTs), Metering Boxes, Vacuum Circuit Breakers (VCBs), Load Break Switches, Drop-Out Fuses, Lightning Arresters, Isolating & Earthing Switches, and Cable Accessories — ISO 9001 certified, IEC 61869 type-tested, serving 40+ countries.
The eight transformers and metering boxes buyers ask about most — each with published technical data, accuracy classes and dimension drawings.
# 01
Current Transformers
LZZBJ9-10 Indoor Current Transformer
3–12 kV indoor cast-resin CT · 0.2S accuracy class · datasheet and dimension drawings.
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# 02
Voltage Transformers
JSZV12-10R Indoor Voltage Transformer
3–12 kV indoor VT · 0.2 class · epoxy cast, rated for continuous operation.
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# 03
Metering Boxes
JLSZV-10 Outdoor High-Voltage Metering Box
10 kV outdoor combined metering unit · 0.2S / 0.2 accuracy · pole or post mounting.
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# 04
Metering Boxes
JLSGWV-10 Outdoor High-Voltage Metering Box
10 kV outdoor metering box · 0.2S CTs with 0.2 VT · single or three-phase wiring.
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# 05
Current Transformers
LZZZBJ9-10 Indoor Current Transformer
10 kV indoor cast CT · 0.2S accuracy · dual secondary winding options.
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# 06
Current Transformers
LZZBJ9-10S Indoor Current Transformer
10 kV indoor CT with split secondary · 0.2S · fits retrofit panels.
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# 07
Voltage Transformers
JSZW12-10 Indoor Voltage Transformer
3–12 kV three-phase indoor VT · 0.2 class · wye/wye wiring.
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# 08
Metering Boxes
JLSZV-35 Outdoor High-Voltage Metering Box
35 kV outdoor combined metering unit · 0.2S / 0.2 · for 33–35 kV feeders.
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Nahu Group (NAHU Electric Technology) is a vertically integrated manufacturer covering research and development, precision design, in-house production, and global sales of electrical metering equipment. Every unit that leaves our facility is built to add a measurable layer of assurance to the power grid it serves.
ISO 9001 and IEC-compliant manufacturing standards.
Exporting to utilities and integrators in 40+ countries.
Full design-to-production pipeline for rapid customization.
3,000+ substations and metering deployments equipped.
55 production models from 3 kV to 40.5 kV, each with full technical data and downloadable dimension drawings.
# 01
3–35 kV
Current Transformers
Indoor and outdoor CTs with 0.2S accuracy and full test data.
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# 02
3–35 kV
Voltage Transformers
Dry-type VTs in 0.2 / 0.5 accuracy classes.
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# 03
10–35 kV
Metering Boxes
Combined CT + VT metering units for grid and industrial feeders.
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# 04
MV cables
Cable Accessories
Cold-shrink terminals and joints for medium-voltage cables.
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# 05
12–40.5 kV
Vacuum Circuit Breaker
Indoor and pole-mounted VCBs with spring or permanent-magnet mechanisms.
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# 06
12–40.5 kV
Isolating Switch
Outdoor and indoor disconnectors with manual or motor drives.
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# 07
Up to 35 kV
High-Voltage Lightning Arrester
Composite-housed surge arresters with external gap options.
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# 08
Distribution lines
Drop-Type Fuses
Drop-out fuse cutouts for distribution line protection.
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Every unit is routine-tested before it leaves our Wenzhou facility, and our manufacturing system is certified to give utilities and integrators confidence in every shipment — from a single sample order to a full substation rollout.
Quality management system covering design, production and final inspection.
Design and testing aligned with international instrument transformer standards.
Ratio, polarity and dielectric checks performed on every unit before dispatch.
Crated and documented for sea, air or rail freight to any destination.
From our Wenzhou factory, Nahu Group (NAHU Electric) equipment ships to utilities, EPC contractors and distributors in 40+ countries across five regions.
From a single epoxy-cast current transformer to a complete substation metering package — designed, tested and delivered under one roof since 2008.
Every metering instrument a substation needs.
ISO 9001, IEC- and GB-tested exports.
From prototype to full series.
3,000+ substations equipped worldwide.
Installation practice, product selection and the operating principles behind current and voltage transformers.
The step-by-step commissioning sequence our field engineers follow — mounting height, surge protection, phase sequence, …
Instrument transformers are the hubs of the grid and the safety barrier between high-voltage plant and the people workin…
Ratio, isolation, and why secondary outputs moved from amps to milliamps as metering went digital.…
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