JINJIA JJ Series Brushless AC Alternators
Our own-brand generator ends, engineered to international standards (GB755 / IEC60034 / BS5000 / NEMA). Class H insulation, IP23 protection, 50Hz & 60Hz dual-frequency ratings from 34 kW to 2,868 kW, with high-voltage 6,300V models up to 3,200 kW. Designed to mate with Cummins, Perkins, Volvo, MHI, MTU, SDEC, Yuchai and Weichai engines.
The JINJIA JJ Series — Our Own-Brand Alternator Line
The JJ Series is JINJIA POWER's private-label range of three-phase, four-pole, brushless synchronous alternators. Every frame is built for continuous (PRP) and standby (ESP) duty, with a sealed-for-life bearing, rotating-rectifier excitation and an automatic voltage regulator (AVR). The range uses the same proven frame architecture and power-rating ladder as the leading Chinese FD-class designs, so spare parts, coupling discs and adapter discs are easy to source worldwide. Whether you are an OEM packing a genset, a rental fleet, or a replacement-parts buyer, the JJ Series gives you a dependable Stamford-compatible-form-factor alternator at a factory-direct price.
JJ2 Series
Compact small-power frames for 25–100 kVA gensets. Lightweight, single/double bearing.
JJ3 Series
Workhorse mid-power frames for 100–250 kVA gensets, the industry's highest-volume class.
JJ4 Series
Mid-large frames for 275–400 kVA gensets. Extended core options (S/M/L) available.
JJ8 Series
Heavy-frame machines for 2.5–3.6 MVA gensets, PMG excitation, up to 96.6% efficiency.
JJH Series
Medium/high-voltage alternators for data centres, mining, grid and industrial plants.
Full Power Ratings Table (50Hz / 60Hz)
Power factor 0.8 · Class H temperature rise (125K @ 40°C) · 4-pole · kVA = kW ÷ 0.8. Filter by series:
| Model | 50Hz · 1500 rpm | 60Hz · 1800 rpm | ||||
|---|---|---|---|---|---|---|
| kVA | kW | Eff.% | kVA | kW | Eff.% | |
Note: Ratings shown at 400V (50Hz) and 440V (60Hz), star connection; the same winding is reconnectable for 380/415V and 460/480V. JJ4 S/MS/M/LS/L 50Hz ratings and JJ5/JJ6/JJ7 mid-large frames are being added to the published table — contact us for the latest sheet. All figures are nominal alternator ratings for genset matching; confirm exact nameplate data at order.
Standard Technical Specifications
Recommended Genset Matching
Cummins 4B/4BT, SDEC & Yuchai small engines
Cummins 6BT/6CT/6LT, NT855-class, QSL9
Cummins QSM11 / M11-class engines
Cummins QSK60 / KTA50-class large engines
Data centres, mining, grid-tie & industrial plants
Engine kW ≈ alternator kW × 1.1–1.15 for altitude/temperature margin
Specify JINJIA JJ Series on Your Next Genset
Tell us your engine model, target kVA, frequency (50/60Hz) and voltage — we'll confirm the exact JJ frame, coupling disc and lead time. OEM, distributor and replacement orders welcome.
Get a Fast Quotation WhatsApp UsFrequently Asked Questions
Is the JINJIA JJ Series your own brand?
Yes. JJ is JINJIA POWER's own-brand (private-label) alternator line. We specify the design, frame architecture and quality standards and supply it factory-direct, which is why it is priced below imported brands while meeting the same IEC/GB performance requirements.
Are JJ alternators compatible with Stamford-form-factor parts?
The frames follow the same proven architecture as mainstream FD / Stamford-form-factor designs, so SAE adapter discs, coupling discs and common wear parts are widely interchangeable. Confirm the exact flange and disc code with our engineering team for your engine.
What is the difference between the 50Hz and 60Hz ratings?
The same alternator is rated at 1500 rpm for 50Hz markets and 1800 rpm for 60Hz markets. At the higher speed the machine delivers roughly 15–20% more kVA — for example the JJ3D produces 150 kVA at 50Hz and 175–180 kVA at 60Hz. Both columns are listed in the table above.
How do I choose the right alternator for my engine?
Start from the engine's net prime kW, apply PF 0.8 to get kVA, and leave a 10–15% engine margin (small engines 15–25%). Our team will confirm the exact JJ model, single/double bearing arrangement and adapter disc for your engine flywheel housing.
Do you offer high-voltage and PMG versions?
Yes. The JJH range covers 6,300V (10.5kV/13.8kV optional) up to 3,200 kW, and PMG permanent-magnet excitation, IP44, RTD protection and anti-condensation heaters are available across the range on request.