About SHZK
Your trusted Chinese manufacturer of professional Variable Frequency Drives for global industrial applications
10+ Years of VFD Manufacturing Excellence
SHZK is a professional Variable Frequency Drive manufacturer located in Yueqing, Zhejiang Province, China — the heart of China’s electrical equipment industry. With over a decade of specialized experience, we design, manufacture, and deliver high-quality VFDs to industrial customers worldwide.
Our WXQ300 Series covers the complete power range from 0.75kW to 720kW across four distinct product lines, serving applications from small workshop motors to heavy industrial drives in manufacturing, water treatment, mining, HVAC, and renewable energy.
Manufacturing Capability
State-of-the-art production facilities with rigorous quality control at every stage
R&D Department
Dedicated engineering team specializing in power electronics, motor control algorithms, and thermal management design.
SMT Production Line
Automated SMT assembly lines for PCB production ensuring consistent quality and high-volume manufacturing capability.
Quality Testing Lab
100% full-load aging test on every unit. Comprehensive QC includes insulation resistance, hi-pot, and functional testing.
Warehousing & Logistics
Extensive inventory of standard models for immediate dispatch. Efficient packaging for safe international shipping.
Quality Assurance
Every VFD undergoes rigorous testing to ensure reliability in the most demanding industrial environments
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Premium IGBT Power Module
High-quality IGBT modules with SVPWM control technology for stable, efficient power conversion and extended service life.
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6-Fold Protection System
Comprehensive protection: over-current, over-voltage, under-voltage, over-heat, overload, and short-circuit protection.
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UL94 V-0 Flame-Retardant Housing
Enclosures meet UL94 V-0 flame retardancy rating — the highest level of protection against fire hazards.
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CE / RoHS / LVD Certified
All products comply with European CE marking, RoHS environmental directive, and Low Voltage Directive.
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100% Full-Load Aging Test
Every single unit undergoes full-load burn-in testing before shipment to guarantee field reliability.
Why Partner With Us
More than a supplier — we’re your reliable manufacturing partner for long-term success
Factory Direct Pricing
Source directly from the manufacturer. Competitive pricing with transparent MOQ of just 1 piece.
Full Technical Support
Complete documentation: wiring diagrams, parameter manuals, application guides, and engineering support.
Fast Delivery
Standard models ship within 3-5 days. Custom OEM/ODM orders within 7-15 business days.
Custom & OEM
Logo printing, custom packaging, special voltage configurations, and firmware adjustments.
Shipping & Logistics
Export-grade packaging and large inventory ensure fast, safe delivery to customers worldwide
Trade Shows & Exhibitions
Connecting with partners and customers at trade shows around the world
Our Factory & Products
Take a closer look at our manufacturing facility and product range
Manufacturing Excellence & Quality Assurance
At SHZK, every variable frequency drive is built with precision engineering and rigorous quality control. Our manufacturing process ensures reliable performance in demanding industrial environments worldwide.
End-to-End Manufacturing Control
From component sourcing to final assembly, we maintain strict quality standards at every production stage. Our facility is equipped with modern SMT production lines, automatic PCB coating systems, and comprehensive testing equipment to ensure consistent product quality.
100% Full-Load Aging Test
Every single VFD unit undergoes a full-load aging test before leaving our warehouse. This rigorous testing process includes:
- Full-load burn-in test — Each unit operates at rated power for extended hours to identify any early-stage component failures
- High-temperature stress test — Verifies stable performance under maximum operating temperature conditions
- Voltage fluctuation test — Ensures stable output under unstable input power supply
- Output waveform verification — Confirms clean SVPWM output with minimal harmonic distortion
This commitment to pre-shipment testing significantly reduces field failures and extends product lifespan for our customers.
Quality Certifications
SHZK products comply with international safety and quality standards:
CE Certification
Compliant with European safety directives for global export
ISO 9001
Quality management system certified manufacturing
RoHS Compliance
Environmentally responsible component selection
Additional certifications (TUV, UL, INMETRO) can be arranged for large-volume orders and specific market requirements.
Built for Harsh Industrial Environments
SHZK VFDs are designed to operate reliably in demanding conditions:
Global Export Experience
Our products are trusted by customers across Southeast Asia, Africa, the Middle East, South America, and Europe. With OEM/ODM capabilities and flexible MOQ, we support distributors, system integrators, and project contractors worldwide.
Technical Support
Every SHZK VFD comes with comprehensive support: