Isolation & Special-Duty Transformers
GBK Isolation Transformer
Anyone servicing mains-powered equipment on an open bench knows the risk isn’t just the equipment failing — it’s the ground reference underneath it. Working on a live chassis referenced directly to earth turns a slipped probe into a shock hazard; isolating that equipment from ground with a 1:1 transformer removes the reference instead. The GBK series is built as exactly that kind of bench and lab isolation transformer: full copper coils with a thicker wire gauge for a long service life, a smart LCD display reading voltage and current in real time, and a rated circuit breaker that trips automatically above its rated current. Built to GB/T 9646-1999, it’s suited to appliance repair benches, medical equipment isolation, workshop power, and scientific-research labs — anywhere someone needs to work on or power sensitive equipment without a direct ground reference. Two display styles are available depending on preference, and the range runs from 200VA for bench work up to 5000VA for larger lab or workshop loads.
Key Features
Built for the Bench, Not Just the Spec Sheet
GBK removes the ground reference on equipment under test or repair, with real-time monitoring to keep the work visible.
1:1 Ground Isolation
220V/220V isolation removes the direct ground reference from equipment under test or repair.
Full Copper Coils
Thicker wire gauge and larger coil size for a long service life under repeated bench use.
Smart LCD Monitoring
Real-time voltage and current display keeps the electrical state of the work visible at all times.
Rated Circuit Breaker
Trips automatically above its rated current to protect connected equipment.
Choice of Display Styles
Two front-panel display styles available to match different preferences.
200-5000VA, GB/T 9646-1999
Sized for bench repair work through larger lab and workshop loads.
OEM & ODM Capabilities
Built-to-Order for B2B and System Integrators
Flexible OEM and ODM support covering product configuration, specifications, labeling, branding, packaging and project-specific customization requirements.
Configurable Capacity
Standard range 200-5000VA, with larger custom builds available on request.
Display Style Selection
Choose between two front-panel display styles for the finished product line.
Enclosure & Branding Customization
Cabinet finish and labeling configurable for private-label and distributor branding.
Adjustable Protection Thresholds
Breaker rating and protection setpoints tuned to project requirements.
Application-Specific Configuration
Sized and configured for repair-bench, medical-equipment, workshop, or lab isolation use.
Small-to-Large Batch Production
From prototype quantities to volume production for distributors and equipment manufacturers.
Technical Specifications
Electrical tolerances and protection ratings are shared across the GBK series; capacity, current, and dimensions scale by model.
| Product Name | GBK Series Single-Phase Isolation Transformer |
|---|---|
| Applicable Standard | GB/T 9646-1999 |
| Phase | Single-phase |
| Rated Voltage | 220V/220V (1:1 isolation) |
| Rated Frequency | 50Hz/60Hz |
| Short-Circuit Impedance | 4% |
| Insulation Class | F |
| Overload Capacity | 2× rated current, sustained 60 seconds |
| Dielectric Strength | 1500V, no breakdown within 1 minute |
| Ambient Temperature | -20°C to 45°C |
| Noise | ≤65dB (at 1 meter) |
| Temperature Rise | ≤75K (transformer body and output terminals) |
| Cooling Method | Self-cooling |
| Terminal Block | Clearly labeled terminal block |
| Protection Rating | IP20 |
| Factory Testing | Per national standard and technical agreement |
| Dielectric | 1500V/1min |
|---|---|
| Overload | 2× / 60s |
| Capacity | 200-5000VA |
| Noise | ≤65dB |
| Model | Rated Capacity | Rated Output Current | Dimensions (L×W×H) | Net Weight | Recommended Load |
|---|---|---|---|---|---|
| GBK2-200VA | 200VA | 0.9A | 270×190×130mm | 4.4KG | ≤200VA |
| GBK2-300VA | 300VA | 1.3A | 270×190×130mm | 5.5KG | ≤300VA |
| GBK2-500VA | 500VA | 2.2A | 270×190×130mm | 6.7KG | ≤500VA |
| GBK2-1000VA | 1000VA | 4.5A | 375×275×220mm | 8.6KG | ≤1000VA |
| GBK2-2000VA | 2000VA | 9A | 320×215×175mm | 15.6KG | ≤2000VA |
| GBK-3000VA | 3000VA | 13.6A | 330×245×250mm | 20.5KG | ≤3000VA |
| GBK-4000VA | 4000VA | 18.1A | 410×240×370mm | 28.5KG | ≤4000VA |
| GBK-5000VA | 5000VA | 22.7A | 400×240×360mm | 34.5KG | ≤5000VA |
Construction & Configuration
Full copper coils sit inside a steel enclosure with a real-time LCD display, rated breaker, and a choice of front-panel styles.
Full Copper Coil Winding
Thicker wire gauge and larger coil size than a standard build, for a longer service life under bench use.
Smart LCD Display Panel
Front-panel screen reads voltage and current in real time for continuous visibility during work.
Rated Circuit Breaker
Front or side-mounted breaker trips automatically above its rated current to protect connected equipment.
Choice of Two Display Styles
Two front-panel display designs available, so the finished look can match different aesthetic preferences.
Labeled Terminal Block
Clearly marked terminal connections for straightforward wiring on a repair bench or lab setup.
Steel Enclosure with Feet
Compact steel housing with rubber feet for stable placement on a bench or workshop table.
Standards & Test Documentation
GBK is built to GB/T 9646-1999 by an ISO9001 and CE certified manufacturer, with dielectric withstand tested on every unit.
GB/T 9646-1999
Built to the national standard governing isolation transformer design and testing.
ISO9001 & CE Certified
Manufactured under ISO9001 quality management with CE certification.
Dielectric Withstand Test
Every unit is tested at 1500V for one minute with no breakdown.
Need Isolation for a Repair Bench or Lab Setup?
Tell us your capacity and application — we'll configure a GBK unit or another series to match.