DHI

What DHI does

Wuxi Nanfang Electrical Apparatus Co., Ltd (NANFANG, branded as DHI in this dataset) is a privately held Chinese manufacturer of high-voltage and medium-voltage electrical apparatus headquartered in Xishan District, Wuxi, Jiangsu Province. The company was founded roughly 20-30 years ago and operates from a single manufacturing facility, producing four main product categories: vacuum circuit breakers (VS1, VS1-24, ZN85B-40.5, 3AV5, VBR outdoor, and the HVB-12 flagship series), vacuum contactors (JCZ5, JCZ7, JCZ1, and a 12kV permanent-magnet variant), spring operating mechanisms (for VS1, SF6, and GF-1 VCB applications), and a welding machine line (medium-frequency spot, projection, and twin-roller seam welders). Its core technology is centered on vacuum interrupter physics, spring operating mechanisms, and epoxy solid-sealing insulation technology originally licensed from ABB and SIEMENS, with several product lines explicitly referencing ABB's VD4 series as the design basis.

The business operates a B2B direct-sales model targeting four vertical segments: industrial and mining enterprises, power plants and transformer stations, industrial automation, and building/infrastructure (including data centers and new-energy applications). Pricing is quote-based and customized to customer specifications, with no public price list; sales are conducted via the company's 12-language website, direct email/phone contact, and inquiry forms. Annual production exceeds 10,000 sets of circuit breakers and operating mechanisms, and finished products are shipped internationally to markets including India, Malaysia, Thailand, Russia, and Kenya. The company holds ISO 9001:2015 (GBT 19001-2016) quality certification and a registered patent for a convenient high-voltage circuit breaker design.

Operationally, Wuxi Nanfang shows a pattern of incremental product-line expansion through 2025-2026, adding dry-type transformers, in-house electrical control cabinets, a flagship HVB-12 vacuum circuit breaker, and a precision frequency-conversion projection welding machine. No external funding, M&A activity, partnerships, public listing, or parent-company relationships are disclosed in the available data; ownership appears to remain founder/management-controlled. The customer base is described only at the segment level with no named enterprise logos, and no management team or revenue figures are publicly disclosed.

Name

DHI

Legal name

Wuxi Nanfang Electrical Apparatus Co., Ltd

Website

https://nfhj.com

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Wuxi Nanfang Electrical Apparatus Co., Ltd is a privately held Chinese OEM manufacturing vacuum circuit breakers, vacuum contactors, spring operating mechanisms, welding machines, transformers, and control cabinets for industrial, mining, power utility, and building infrastructure customers, exporting globally under the NANFANG brand.

Ownership category

akta.pro rank

Product category

High-Voltage Electrical Apparatus

NAICS

Relay and Industrial Control Manufacturing (335314), Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Electrical Industrial Apparatus (3620), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Industrial Safety & Security Electronics Manufacturing (Safety relays, E-stops, light curtains, access control) (IMAGAGAG)

Keywords

• Vacuum circuit breakers
• High voltage apparatus
• Vacuum contactors
• Spring operating mechanisms
• Industrial welding machines

Headquarters

HQ city

Wuxi Shi

HQ country

China

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Industrial Electrical Equipment Sales: Revenue generated from manufacturing and selling high-voltage electrical apparatus including vacuum circuit breakers, vacuum contactors, operation mechanisms, and welding machines. Products sold as capital equipment to industrial customers with quote-based pricing for custom specifications.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Wuxi Nanfang manufactures and sells high-voltage electrical apparatus including indoor vacuum circuit breakers (12kV–40.5kV, 630A–4000A), high-voltage vacuum contactors (200A–800A up to 35kV), spring operating mechanisms matched to its breakers, and a line of industrial welding machines (medium-frequency spot, projection, seam, and pneumatic models), plus dry-type transformers. The company operates from Wuxi, Jiangsu, China with annual production exceeding 10,000 sets of breakers and mechanisms, and exports to industrial and utility customers worldwide.

Product overview

Wuxi Nanfang Electrical Apparatus Co., Ltd (NANFANG) is a manufacturer of high-voltage electrical apparatus offering four main product categories: Vacuum Circuit Breakers (including VS1 series, ZN85 series, 3AV5 series, and HVB-12 indoor high-voltage circuit breakers ranging from 12kV to 40.5kV with current ratings from 630A to 4000A), Vacuum Contactors (JCZ5, JCZ7, and JCZ1 series contactors rated from 200A to 800A for applications up to 35kV including permanent magnet types), Spring Operating Mechanisms (for circuit breakers including VS1, SF6, and GF-1 VCB mechanisms), and Welding Machines (medium frequency spot, projection, and seam welding machines). The company produces over 10,000 sets of circuit breakers and operation mechanisms annually, serving industrial and power distribution applications.

Differentiator

Problem solved

Functional benefit

Products and services

• VS1 Series Vacuum Circuit Breaker VS1-12(ZN63A) series indoor high-voltage vacuum circuit breakers with closed insulation form, main insulating cylinder, and inner/outer skirts. Rated for 12kV applications with current ratings from 630A to 4000A and equipped with spring operating mechanism for electric and manual operation. Sold to industrial and utility customers as protection and control switchgear.
• VS1-24 Series Vacuum Circuit Breaker 24kV indoor high-voltage vacuum circuit breaker designed and improved on the basis of ABB's VD4-24 platform, rated for 24kV applications with 630A capacity. Targeted at industrial and substation customers needing higher-voltage switching.
• ZN85B-40.5 Series Vacuum Circuit Breaker Indoor high-voltage AC vacuum circuit breaker for three-phase AC 50Hz systems at 40.5kV rated voltage, equipped with a spring operating mechanism for electric and manual opening/closing. Serves substation and industrial high-voltage protection applications.
• 3AV5-12 Series Vacuum Circuit Breaker High-voltage vacuum circuit breaker adopting ABB and SIEMENS solid sealing insulation technology, with vacuum interrupter and primary main circuit parts sealed with epoxy resin materials to form poles with high insulation and mechanical strength. Sold for high-voltage switchgear installations.
• VBR(VS1)-12 Series Outdoor Vacuum Circuit Breaker Three-phase power system indoor high-voltage switchgear with rated voltage of 12kV at 50Hz, used as protection and control electrical appliances for 33kV outdoor applications.
• Intelligent Vacuum Circuit Breaker VS1-12(ZN63A) intelligent vacuum circuit breaker with closed insulation form, main insulation tube with inner/outer skirts, and creepage ratio meeting DL standard requirements. Targeted at intelligent substation and digital switchgear applications.
• HVB-12 Indoor High-Voltage Vacuum Circuit Breaker Flagship indoor high-voltage vacuum circuit breaker from Wuxi Nanfang, described as a cutting-edge solution for medium-voltage power distribution with high reliability and performance for indoor power distribution scenarios.
• JCZ5 Series Vacuum Contactor Three-phase AC vacuum contactor suitable for 50Hz–60Hz systems at rated working voltages of 3.6kV, 7.2kV, and 12kV with rated working currents of 200A, 400A, and 630A. Operates electric motors, transformers, capacitors and other electrical equipment in industrial settings.
• JCZ7 Series AC Vacuum Contactor 800A AC vacuum contactor for three-phase indoor electrical appliances at AC 50Hz–60Hz, rated working voltages of 7.2kV and 12kV, and rated working currents of 200A, 400A, and 630A.
• JCZ1 Series High Voltage Vacuum Contactor High voltage vacuum contactor suitable for AC 50Hz–60Hz at rated operating voltages of 7.2kV, 12kV, and 35kV, with rated operating currents of 200A, 400A, and 630A. Supports direct or remote operation with single-phase control.
• 12KV Permanent Magnet High Voltage Vacuum Contactor Electromechanical device using permanent-magnet actuation to make and break circuits in high-voltage and high-current applications, offering a smaller and more efficient design than traditional electromechanical contacts. Rated for 12kV applications.
• VS1 Spring Operating Mechanism Complete series of spring operating mechanisms with full specifications covering small to large current, conventional to smart types, enclosed to side-mounting configurations, and voltage ratings from 12kV to 40.5kV. Sold to breaker manufacturers and integrators.
• SF6 Circuit Breaker Spring Operating Mechanism Spring operating mechanism designed for SF6 circuit breaker operation, compatible with ZN28 series high-voltage vacuum circuit breakers and other vacuum circuit breakers with equivalent closing power.
• GF-1 VCB Spring Operation Mechanism VCB spring operation mechanism compatible with ZN28 series high-voltage vacuum circuit breakers and other vacuum circuit breakers with equivalent closing power.
• Medium Frequency Spot Welding Machine Medium frequency spot welding machine for industrial welding applications. Sold to manufacturing customers requiring precision spot welding.
• Medium Frequency Projection Welding Machine Medium frequency projection welding machine for industrial welding applications. Sold to manufacturing customers needing projection welding for fasteners and sheet metal work.
• FNZ Series Twin-Roller Seam Welding Machine Twin-roller seam welding machine for continuous seam welding applications in industrial manufacturing.
• 6KVA Three-Phase Dry-Type Transformer Air-cooled auto-transformer, 50/60Hz, 380V input/220V output. IP21 protection, Class F insulation, compliant with GB/T19212.1-2008. Features compact size, low noise, flame retardant, oil-free construction. Targets industrial automation, machine tools, building power, and new energy applications.
• Electrical Control Cabinets Custom-manufactured electrical control cabinets with workshop assembly and technical performance testing, packaged with moisture-proof and shock-proof protocols. Delivered to industrial project sites for power control applications.

Quantifiable outcome

• Products over 10,000 sets annually with strict quality control
• +1 more outcomes

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• Eaton: US-based power management company with significant medium-voltage vacuum circuit breaker and switchgear products. Comparable as a broader incumbent competing for industrial, mining, and utility electrical infrastructure spend.
• Siemens: German industrial conglomerate with a significant medium-voltage switchgear and vacuum circuit breaker portfolio (e.g., 3AH/3AF families). Comparable as a technology licensor (solid sealing insulation) for Wuxi Nanfang and as a global incumbent competing for the same industrial and utility customers.
• Schneider Electric: French multinational with extensive medium-voltage switchgear and vacuum circuit breaker offerings (e.g., Evolis, Masterclad). Comparable as a broader incumbent serving power plants, transformer stations, and industrial customers targeted by Wuxi Nanfang.
• ABB: Global leader in electrification, motion, and process automation with a dominant portfolio in medium/high-voltage switchgear and circuit breakers. Directly comparable as the technology licensor whose VD4 platform informs Wuxi Nanfang's VS1-24 product, and as the broader incumbent the company is benchmarked against in HV equipment.

Direct peers

• CHINT Group: China-based direct competitor in low- and medium-voltage electrical apparatus including circuit breakers, contactors, and switchgear. Most directly comparable Chinese peer, sharing the same domestic cost structure and targeting similar industrial and infrastructure customers.
• Hyundai Electric & Energy Systems: Korean manufacturer of power equipment including HV/MV circuit breakers, switchgear, and transformers. Comparable as an Asian peer with similar HV/MV product mix and overlapping export markets in Southeast Asia and the Middle East.
• Powell Industries: US-based manufacturer of custom-engineered switchgear, motor control, and power distribution solutions for industrial and utility customers. Comparable as a specialized switchgear/breaker maker competing in similar industrial electrification use cases.
• TBEA: China-based manufacturer of transformers, switchgear, and HV electrical equipment with significant international project presence. Comparable as a Chinese peer operating across transformers and switchgear, addressing overlapping utility and industrial customers.
• Delixi Group: Major Chinese electrical equipment manufacturer offering breakers, contactors, and switchgear for industrial and infrastructure applications. Comparable as a domestic Chinese competitor in the same product categories and customer segments.
• LS Electric: Korean electrical equipment manufacturer with a full portfolio of medium-voltage vacuum circuit breakers, switchgear, and contactors. Comparable in product offering; differs from Wuxi Nanfang primarily as a Korean-domiciled player addressing similar industrial and utility buyers.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about DHI