50HZ YUCHAI YC6MK420L-D20 250kW/312.5kVA Diesel Generator Set

50HZ YUCHAI  250kW/312.5kVA Diesel Generator Set

1. Technical Parameter

2. Core Product Features

The YUCHAI YC6MK420L-D20 250kW/312.5kVA diesel generator set is an upgraded heavy-duty industrial power generation unit optimized on the basis of Yuchai mature 6MK series engine platform. Tailored for long-term heavy-load continuous power generation and frequent emergency switching scenarios, this 312.5kVA 50Hz brushless diesel generator features stable power output, optimized fuel economy and stronger structural durability. It has always been a mainstream high-power power supply solution trusted by engineering contractors, industrial enterprises and public institution users across the country.

2.1 Reinforced Heavy-duty Structure for Long-term Stable Operation

This high-power genset adopts the original Yuchai YC6MK420L-D20 industrial dedicated power engine, equipped with high-strength integral cast iron crankcase and integral cylinder head structure, which greatly improves overall structural rigidity and anti-fatigue performance under long-hour heavy-load operation. The built-in piston internal cooling oil passage effectively reduces core component temperature and mechanical wear, while the wet removable cylinder liner design simplifies later maintenance and replacement work, avoiding integral engine disassembly. Matched with a high-quality brushless self-excited alternator, the unit completely eliminates common faults of traditional brushed generators such as carbon brush wear, electric spark interference and frequent shutdown maintenance. With H-grade ultra-high temperature resistant insulation materials and IP23 dustproof and rainproof protection capability, the whole machine can run stably for a long time in high-temperature, humid and dusty industrial harsh environments, with extremely low operational failure rate.

2.2 Intelligent Common Rail Control with Balanced Fuel Efficiency and Environmental Protection

Powered by advanced electronic high-pressure common rail fuel injection technology, the YC6MK420L-D20 generator set can dynamically adjust fuel injection volume and timing according to real-time load changes, realizing precise fuel supply and full combustion. After professional power calibration optimization, the full-load fuel consumption is controlled at 69.1L/H, and the minimum fuel consumption rate is as low as ≤195g/kW·h, delivering stable energy-saving performance in long-duration heavy-load power generation scenarios. The optimized air intake and exhaust system matches four-valve per cylinder and turbocharged intercooled technology to ensure sufficient air inflow, thorough combustion and low smoke emission. The unit fully complies with Non-road National Stage III emission standards, meeting environmental assessment requirements of industrial parks, urban key projects and large commercial facilities, achieving a perfect balance between high-efficiency power generation and green operation.

2.3 Excellent Transient Response and Strong Harsh Environment Adaptability

Different from ordinary high-power generator sets, this 275kW standby power diesel generator has outstanding transient load response capability, which can quickly cope with instantaneous load surge and grid voltage fluctuation, effectively stabilizing output voltage and frequency to protect precision industrial control equipment and automated production lines. In terms of environmental adaptability, the unit supports reliable cold start at -25℃ without auxiliary heating equipment, fully adapting to winter outdoor construction and long-term power supply in alpine cold regions. It maintains stable power output without derating at an altitude of 2500 meters; the turbocharged intercooled system automatically adjusts air intake pressure and combustion state to adapt to plateau low-pressure working conditions, perfectly meeting heavy-load power demands of plateau mining, road and bridge engineering and remote field projects. The IP23 professional protection grade effectively blocks outdoor floating dust, sundries and light rain erosion, supporting long-term open-air placement and unattended continuous operation.

2.4 Low Lifecycle Maintenance Cost and High Comprehensive Cost Performance

The Yuchai 6MK420L-D20 engine adopts mature industrial modular design with compact layout and fewer vulnerable parts, effectively reducing daily failure probability. The brushless alternator structure saves regular carbon brush replacement and routine debugging work, greatly cutting down daily maintenance workload and operational costs. Relying on Yuchai’s nationwide complete after-sales service network, users can enjoy convenient spare parts supply and professional after-sales maintenance services, with low later maintenance threshold. The ultra-long major overhaul cycle of more than 12000 hours minimizes equipment shutdown maintenance time and long-term investment cost. Whether used for fixed indoor industrial standby power or mobile field heavy-load power supply, this genset maintains stable performance and long-term operational reliability, with obvious comprehensive cost performance advantages.

3. Main Application Scenarios

With stable 250kW prime continuous heavy-load power output, 275kW emergency peak power reserve and excellent multi-condition adaptability, the YUCHAI YC6MK420L-D20 diesel generator set covers large industrial production, municipal infrastructure construction, super commercial complexes, field heavy-duty engineering and urban comprehensive emergency power guarantee fields, serving as the preferred high-power power supply equipment for medium and large-scale high-load power demand projects.

3.1 Large Industrial Production Base Emergency Backup Power

This genset is widely used as core emergency backup power for large manufacturing factories, chemical industrial parks, metallurgical enterprises, textile production bases and large mining enterprises. For fully automated production lines, heavy mechanical equipment and precision industrial instruments that cannot tolerate sudden power outages, this 312.5kVA industrial diesel generator can start rapidly and switch power supply automatically after grid power failure. It effectively avoids large-area production shutdown, product scrapping and equipment burnout losses caused by power interruption, ensuring continuous and orderly industrial production operation. Meanwhile, it can serve as the main power supply for remote industrial parks and mining areas with unstable municipal grid power or insufficient power capacity to meet long-term heavy-load power generation demands.

3.2 Super Commercial & Public Infrastructure Power Guarantee

As a high-reliability heavy-duty emergency power unit, it is suitable for standby power configuration of super high-rise office buildings, large shopping mall clusters, five-star hotel groups, tertiary comprehensive hospitals, university campuses and urban public service centers. For key facilities including hospital emergency rescue equipment, building fire linkage systems, data center monitoring systems and public power distribution systems that require ultra-high power supply stability, the YC6MK420L-D20 genset provides 24-hour uninterrupted emergency power support, guaranteeing normal operation of public service facilities and eliminating major safety hazards caused by sudden power failures.

3.3 Municipal & Field Heavy-duty Engineering Main Power Supply

In municipal key projects, large-scale bridge and tunnel engineering, water conservancy and hydropower construction, railway transit engineering and remote field exploration projects where municipal power grid coverage is unavailable or unstable, this Yuchai heavy-duty generator acts as the core main power supply equipment. It steadily provides continuous power for large engineering machinery, high-power welding equipment, field construction assembly lines and temporary office facilities. Its excellent low-temperature startup performance and plateau non-derating capability enable stable operation in complex and harsh field working conditions, making it an essential power guarantee equipment for large engineering construction teams and infrastructure projects.

3.4 Urban Emergency Rescue & Special Scenario Power Supply

The unit is commonly deployed for urban natural disaster emergency relief, power grid overhaul emergency power supply, large communication base station cluster backup power, scenic area peak power supply and remote regional power supply. When extreme weather, grid faults or sudden large-scale power outages occur, it can start up quickly and put into operation to sustain basic urban operation and public service power demands. It also meets high-load temporary power needs for large outdoor exhibitions, temporary engineering construction and emergency rescue sites, featuring strong scenario compatibility and practical value.

4. Core Product Purpose

The core purpose of the YUCHAI YC6MK420L-D20 250kW/312.5kVA diesel generator set is to provide stable, energy-saving and durable heavy-load power supply solutions for medium and large industrial and commercial high-load projects. The 250kW prime power is designed for long-term continuous bearing of industrial heavy-load equipment, satisfying daily off-grid main power supply and long-duration continuous power generation demands of large enterprises, mining areas and engineering projects. The 275kW standby power reserves sufficient peak capacity for sudden power failure emergency response and instantaneous heavy-load power compensation, effectively solving common industry pain points such as municipal grid instability, regional power shortage and economic losses caused by unexpected power outages.

As a premium 50Hz industrial brushless self-excited heavy-duty diesel generator set, it focuses on industrial-grade heavy-load reliability and long-term operational economy. Adopting Yuchai 6MK series mature heavy-duty engine technology and high-stability brushless alternator configuration, it enhances equipment anti-interference capability and heavy-load resistance, while lowering long-term operation and maintenance costs for users. It not only meets high-load power demands of large industrial production and super commercial complex operation, but also provides solid power guarantee for harsh field engineering construction and urban comprehensive emergency rescue scenarios, standing as a cost-effective high-power generation equipment integrating energy saving, environmental protection, stability and durability.

5. Common FAQ

Q1: What is the difference between prime power and standby power of YC6MK420L-D20 generator set in actual use?

Prime power (250kW/312.5kVA) refers to the continuous usable rated power of the genset, supporting long-term cyclic full-load operation. It is mainly used for daily main power supply, long-term off-grid power generation and stable heavy-load industrial production operation. Standby power (275kW/344kVA) is short-term emergency peak power, specially designed for sudden grid power failure or instantaneous heavy-load surge scenarios. It only allows short-duration emergency operation and cannot run continuously at full load for a long time, otherwise it will accelerate aging of engine core components and shorten the overall service life of the unit. In actual engineering application, professional operators usually control the operating load within 80% of prime power to ensure long-term stable and efficient heavy-load operation.

Q2: Why is brushless self-excited alternator widely adopted on this Yuchai high-power genset?

The YC6MK420L-D20 generator set is equipped with industrial-grade brushless self-excited alternator, which abandons the traditional carbon brush and slip ring friction structure. This design eliminates common operational faults such as carbon brush wear, electric spark generation and frequent replacement maintenance during long-term heavy-load operation, greatly reducing daily failure rate and maintenance workload. Matched with H-grade high-temperature resistant insulation and IP23 dustproof and rainproof protection grade, it resists high-temperature aging and external environmental erosion effectively. The voltage regulation accuracy is controlled within ≤0.5%, avoiding voltage and frequency fluctuation and protecting industrial precision electrical equipment and automated production lines. It is highly suitable for long-term unattended heavy-load operation in industrial projects and harsh outdoor environments.

Q3: Can the YC6MK420L-D20 diesel generator adapt to plateau and low-temperature harsh working environments?

This heavy-duty industrial genset has passed strict extreme environment adaptation tests with excellent environmental tolerance. It achieves reliable cold start at -25℃ without auxiliary heating equipment, adapting to winter outdoor construction and industrial power supply in alpine cold regions. When operating at an altitude of 2500 meters, the turbocharged intercooled system automatically adjusts air intake volume and combustion status, maintaining stable heavy-load power output without power derating and adapting to plateau low-pressure working conditions. Meanwhile, the IP23 professional protection structure effectively resists outdoor dust, moisture and light rain erosion, ensuring long-term stable and reliable heavy-load operation in various complex and harsh working scenarios.