Facilities searching for a sound-attenuated diesel generator set that can withstand demanding, noise-restricted industrial sites now have a clearly documented option in the Diesel Generator Set MLY138 (Silent Type), manufactured by Guangdong Minlong Electrical Equipment Co., Ltd. (operating under the Minlong Power brand). Built around a Yuchai YC4D180-D33 engine, this unit is positioned specifically for prime and standby power applications where both acoustic control and operational reliability are non-negotiable.

Quiet Operation as a Core Design Priority

The defining feature of the MLY138 is its SilentType canopy, engineered to address noise-sensitive installation environments. The enclosure is rated at 75 dB at 7 m, a figure that directly reflects the industry pain point the company set out to solve: deploying diesel power in locations where excessive noise is operationally or environmentally unacceptable. The canopy also integrates drainage provisions for fuel and water, supporting fluid management and ongoing service access, along with lifting lugs and forklift pockets for safe on-site handling—an important consideration for heavy industrial users who must move equipment across uneven or constrained job sites. The canopy is finished in green as standard, with customizable color options, and the overall unit carries an IP44 enclosure rating, while the alternator and controller carry IP23 and IP65 ratings respectively, reinforcing protection against dust and moisture ingress in outdoor industrial settings.

Power Output and Engine Architecture

At the heart of the system is the Yuchai YC4D180-D33 engine, a 4-cylinder, L-type, 4-stroke diesel unit featuring exhaust gas turbocharged intercooling and direct injection fuel delivery. Fuel metering and speed control are managed through an electrically controlled high voltage common rail governing system, with a displacement of 4.21 L, a bore/stroke of 108 x 115 mm, and a compression ratio of 16.7:1. The engine delivers a prime power rating of 120 kW and a standby power rating of 132 kW, translating at the generator set level to 125 kVA/100 kW prime power and 137.5 kVA/110 kW standby power, operating at 230/400 V across 1/3 phase configurations and 60 Hz at 1,800 rpm, with a power factor of 0.8.

For fuel planning in heavy-duty continuous operation, the engine is rated for Class A2 diesel and consumes 34.6 L/h at 100% ERP, 31.6 L/h at 100% PRP, 25.4 L/h at 75% PRP, and 17.9 L/h at 50% PRP. The unit carries a 150 L base fuel tank, supporting extended running between refueling cycles—an operational advantage for sites where fuel logistics are difficult to manage on tight schedules.

Electrical Output Stability and Control

Power conversion is handled by a GZSTF Power STF100-1-4 alternator, rated at 100 kW with a maximum overspeed of 2,250 RPM. It uses a self-excited, brushless excitation system, a 4-pole configuration suited to 60 Hz output at 1,800 rpm, and 6 winding leads, supported by a single bearing design. The alternator's Class H insulation with a 125/40°C temperature rise rating, combined with voltage regulation held within ±1% and a harmonic coefficient (THF) below 2%, point to a stable output profile suited for load-sensitive heavy industrial equipment. The telephone influence factor is kept below 50, further limiting harmonic interference in connected systems.

Monitoring and protection are managed through a SmartGen HGM6110 controller, featuring a graphic back-lit LCD display (132 x 64 pixels), 4 binary inputs and 4 binary outputs, 3 analog inputs, and measurement capability across Vac, A, Hz, kVA, kW, and Vdc. The controller also maintains an event log covering alarms and operating hours, and connects externally via USB and RS485 communication interfaces—a practical feature for facilities integrating the generator into broader monitoring or automation systems.

Built for Durability in Industrial Conditions

The unit's physical construction reflects its industrial orientation. It measures 3,200 mm in length, 1,100 mm in width, and 1,800 mm in height, weighing 1,700 kg, figures that define both installation footprint and lifting requirements on site. The base frame is corrosion-resistant, and the drivetrain includes a flexible coupling on the common base to dampen vibration, while the engine side is fitted with silencers and bellows to manage exhaust noise and vibration transfer. A maintenance-free lead-acid battery supports engine starting, and the electrical isolation is handled by a 3-pole manual circuit breaker.

Beyond the standard configuration, Minlong Power offers a range of optional components aligned with varied heavy industrial use cases. These include an intermediate cold water heater, oil preheater, air starting motor, a heavy-duty air filter for desert conditions, and a heavy-duty secondary muffler on the engine side. Alternator options extend to an anti-condensation heater, permanent magnet excitation system (PMG), voltage droop for parallel connection, and RTD temperature sensors. On the electrical system side, options include a remote control system separated from the unit, ATS automatic load transfer screen, and a fully automatic parallel screen for multiple units—relevant for industrial sites requiring synchronized multi-unit operation. Fuel system options cover a buried fuel tank, oil water separator, and fully automatic oil supply system, while broader deployment formats include rainproof units, trailer type units, and vehicle mounted power generation vehicles, alongside cooling system alternatives such as marine cooling systems and heat exchanger and external circulation cooling towers.

Quality Assurance and After-Sales Coverage

Every MLY138 unit is brand new and undergoes strict factory testing before delivery, reflecting the company's stated commitment to quality control at the manufacturing stage. Minlong Power backs each unit with a warranty period of 18 months after commissioning and acceptance, or 1,500 operating hours, whichever expires first, providing a defined service assurance window for industrial buyers planning long-term deployment.

Summary Assessment

For heavy industrial operators evaluating a sound-attenuated diesel generator built around a Yuchai engine platform, the MLY138 presents a documented set of technical credentials: a 75 dB at 7 m noise rating, 125 kVA/100 kW prime and 137.5 kVA/110 kW standby output, ±1% voltage regulation, and a configurable optional parts catalog spanning cooling, fuel, electrical, and mobility formats. Manufactured and sold by Guangdong Minlong Electrical Equipment Co., Ltd. out of its Foshan, China office and factory, the product combines engine, alternator, and controller components into a single integrated generator set designed around the specific demands of noise-constrained, heavy-duty industrial operation.