Cummins 4B Series 40kVA Diesel Generator for Small Shops & Retail Business Backup Power
| Engine: | Cummins | Fuel Type: | Diesel |
| Coolingsystem: | Radiator Cooled | Cooling System: | 40℃ Standard Water Cooling Cycle |
| Cerificate: | ISO9001/ CE | Rated Voltage: | 400V/230V |
| Starting Method: | DC 24V DC Start | Oil Supply Method: | Direct Injection |
| Debugging Method: | Electronic Speed Regulation | Air intake Method: | Turbocharged Intercooler |
| High Light: | Shop 40kVA Diesel Generator,Shop Diesel Generator 40kVA,Shop Generator Standby Power |
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Cummins 4B Series 40kVA Diesel Generator for Small Shops & Retail Business Backup Power
Product Overview
WOPUSAI Cummins 4B series 40kVA open-frame diesel generator set is equipped with genuine Cummins 4B3.9-G2 diesel engine, matched with reliable TFW brushless all-copper alternator. This compact power unit is designed for light standby power scenarios, featuring small footprint, low fuel consumption and easy daily maintenance. The 4B3.9-G2 engine adopts mature 3.9L inline four-cylinder design, stable performance and low noise, perfectly suitable for small shops, residential backup power and small workshop emergency power supply.
Product Showcase
This WOPUSAI 40kVA Cummins 4B series genset adopts open-frame structure, neat layout with fully protected wiring harness. The whole unit is assembled on integrated base frame with built-in shock absorbers. Matched with genuine Cummins 4B3.9-G2 engine and TFW brushless all-copper alternator, it is compact and easy to transport, ideal for small standby power projects.

Key Specifications
40kVA-63kVA 4B series series Cummins open frame unit |
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| Rated power | 33KW/40kVA | 40KW/50kVA | 50KW/63kVA |
| Rated current | 59.4A | 72A | 90A |
| Rated voltage | 400V/230V | ||
| Rated frequency | 50Hz/60Hz | ||
| Rated speed | 1500rpm/1800rpm | ||
| Fuel consumption | 250g/KW.h | ||
| Dimensions | 1750*650*1100mm | 1750*650*1100mm | 1750*650*1100mm |
| Unit weight | 750KG | 800KG | 950KG |
| Noise index | 110dB | ||
| Model | 4B3.9-G2 | 4BT3.9-G2 | 4BTA3.9-G2 |
| Number of cylinders | 4L | ||
| Bore stroke | 102*120MM | ||
| Exhaust volume | 3.9L | ||
| Starting method | DC 24V DC start | ||
| Cooling method | 40℃ standard water cooling cycle | ||
| Oil supply method | Direct injection | ||
| Debugging method | Electronic speed regulation | ||
| Air intake method | Inhale naturally | Turbocharging | Turbocharged intercooler |
| Generator configuration | Brushless all copper | ||
| Brand/Model | Foshan STAMFORD TFW-20 | Foshan STAMFORD TFW-30 | Foshan STAMFORD TFW-50 |
| Rated power | 33KW/40kVA | 40KW/50kVA | 50KW/63kVA |
| Insulation level | H | ||
| Protection level | IP 23 | ||
| Wiring method | Star connection | ||
| Adjustment method | AVR automatic voltage regulation | ||
| Power Factor | 0.8 lag | ||
✅ Core Advantages
- Compact structure, occupies little installation space, easy to transport and install
- Low operation noise and economical fuel consumption for long-time standby use
- Simple structure design, spare parts are widely available, low maintenance cost
- Thickened base frame fitted with high-quality shock-absorbing pads to reduce vibration transfer during operation, enhancing the whole unit stability and prolonging service life.
- Intelligent control panel, real-time monitoring of voltage, current, oil pressure and temperature, automatic alarm for faults.
🎯 Application Scenarios
- Small commercial stores, supermarkets and office buildings standby power
- Villas and residential emergency backup power
- Small workshops and light industrial temporary power supply
- Telecom base stations, monitoring room backup power
Brand Introduction
Cummins is a world-leading power equipment manufacturer founded in 1919 in USA. It specializes in designing and producing diesel engines, generator sets and related power solutions. Cummins engines are widely recognized for outstanding reliability, fuel economy and global after-sales service network. Cummins 4B series engines are classic light-duty power products, well-proven in global markets for decades.
