Product Search
Find the right transformer for your needs
Products
43 Categories · 7251+ Models
QDTB® Product Portfolio
QDTB® is a leading transformer and substation manufacturer in China with 25+ years of experience. Our product portfolio covers the full spectrum of power equipment for generation, transmission, distribution, and utilization.
- Dry-Type Transformers Cast resin dry-type transformers with epoxy insulation, fire-safe for indoor installation.
- Oil-Immersed Transformers Oil-immersed transformers from S11 to S20 series, high-efficiency and energy-saving.
- Box-Type Substations European-type (compact), American-type (pad-mounted) prefabricated substations, factory-assembled.
- Amorphous Alloy Transformers Amorphous alloy core transformers with ultra-low no-load losses for energy efficiency.
- Switchgear & Ring Main Units HV/LV switchgear, ring main units, reactors, and cable branch boxes.
All products are ISO 9001 certified and CE marked, complying with IEC/IEEE/GB standards.
Explore Products by Application
Power Transmission & Distribution
Transformers, switchgear, substations and reactive compensation for power transmission and distribution networks.
Industrial Power & Control
Control transformers, voltage regulators, UPS and power supplies for industrial equipment and automation.
Solar Power and Energy Storage
PV modules, inverters, batteries and balance-of-system equipment for solar generation and energy storage projects.
All Product Categories
Dry-Type Transformers
1464 model
Oil-Immersed Transformers
1324 model
Special/Isolation/Control Transformers
2137 model
Amorphous Alloy Transformers
379 model
Box-Type Substations
48 model
American Pad-Mounted Transformers
9 model
Reactors
458 model
Cable Branch Boxes & Switching Stations
27 model
Ring Main Units (RMU)
15 model
High Voltage Switchgear
82 model
Low Voltage Switchgear
130 model
Single Phase Transformers
232 model
Three Phase Transformers
120 model
Voltage Regulators
100 model
Variable Transformers
66 model
Inverters (DC-AC)
15 model
DC Power Supplies
163 model
Battery Chargers
99 model
Motor Starters
55 model
UPS (Uninterruptible Power Supply)
55 model
Power Capacitors
17 model
Solar PV Modules
11 model
String Grid-tie Inverters
18 model
Hybrid Solar Inverters
11 model
Energy Storage Batteries
10 model
PCS Power Conversion Systems
8 model
Battery Management Systems (BMS)
6 model
ESS Fire Suppression Systems
4 model
PV Mounting Structures
6 model
DC Cables, Connectors & SPD
8 model
Monitoring, Protection & SCADA
4 model
Cables, Trays, Grounding & Fasteners
15 model
Energy Storage Containers
5 model
Busway (Bus Duct)
27 model
EV Charging Stations
9 model
Pole-Mounted Switchgear
9 model
SVG & SVC Static Var Compensation
13 model
Active Harmonic Filters
10 model
Automatic Transfer Switches
23 model
Diesel Generator Sets
19 model
EPS Emergency Power Supply
18 model
Wind Turbines
6 model
SCADA & Secondary Automation
16 model
Engineering Calculators
Use our professional engineering tools to size and price your project in minutes.
Distribution System Calculator
Design a complete power distribution system — transformer, HV & LV switchgear, cables, busbar and grounding — with a full bill of materials and reference FOB price.
Open Calculator →Solar System Configurator
Size your solar array, storage and balance-of-system, and get an instant bill of materials.
Open Calculator →Frequently Asked Questions
QAre you a manufacturer or a trading company?
We are a manufacturer. QDTB is a registered brand of Shandong Yaqing Electrical Technology Co., Ltd. — 25+ years in business, a 100,000 m² production base in Qingdao, and our own in-house engineering team. We manufacture transformers, switchgear and prefabricated substations ourselves, and integrate third-party equipment such as inverters, batteries and EV chargers into complete systems under our own quality and test procedures. We also build to customer specifications, including private labelling and local standards adaptation.
QWhat exactly is included in a complete electrical system from QDTB?
A complete system typically includes: system design and single-line diagram; load analysis and equipment sizing calculations; the full equipment list (transformers, MV/LV switchgear, protection, power factor correction, energy storage, EV charging and cabling); construction drawings; factory acceptance test (FAT) procedures; export packing and shipment to your port; commissioning guidance; and the full documentation package. You can take the whole scope or any part of it.
QDo you supply single units or only complete systems?
Both. You can order a single transformer or substation, or a full configured system. The online configurator produces an equipment list that you can purchase as a whole or item by item. There is no minimum order quantity for standard catalogue products.
QHow does the online configurator work?
Choose your application scenario, enter your load and site conditions, and the configurator generates a single-line diagram, sizing calculations, construction drawings, a complete bill of materials and indicative pricing — in minutes, with no registration required. Each result can be shared with our engineers for review, and we confirm the final design before production.
QWhat is the typical lead time for a complete power system?
Standard distribution equipment ships in 30-45 days. A complete configured system — transformer, switchgear, storage and charging equipment — typically takes 45-75 days from design freeze, including assembly, routine testing and export packing. Large-capacity or fully customised projects: 90-120 days. This remains significantly faster than many Western manufacturers, and rush orders can be accommodated for urgent projects.
QHow is a system priced?
Each configured system returns a complete equipment list with budgetary unit prices on an EXW / FOB Qingdao basis, so you can see the cost of every item and adjust the scope. For projects we issue a formal quotation that can include freight and insurance options (CIF / DAP), spare parts and commissioning.
QWhat certifications do your products hold?
Our products are ISO 9001 / 14001 / 45001 certified, CE marked on selected models, and designed to meet IEC, IEEE and GB standards. Routine test certificates are issued with every unit, and third-party inspection (SGS, BV, Intertek and others) can be arranged on request.
QWhich applications do you cover?
We supply power systems for data centres, airports, hospitals, ports and terminals, mining sites, manufacturing plants, commercial and office buildings, utility-scale solar and wind farms, battery storage projects, microgrids and off-grid or remote power. Around 27 scenario templates are available in the configurator as a starting point.