Compact Substations
European-Style 1500 kVA / 33 kV Compact Box Substation
- Rated Capacity: 1500 kVA
- Rated Voltage: 33 kV
- Frequency: 50 / 60 Hz
Product line
Compact & Box-Type Substations
Prefabricated box-type, European-style and American-style compact substations, 10–35 kV, up to 5,000 kVA, integrating MV switchgear, transformer and LV distribution in one enclosure.
- All (140)
- Compact Substations (23)
- Oil-Immersed Transformers (19)
- Dry-Type Transformers (16)
- Power Transformers (16)
- Pad-Mounted Transformers (5)
- Pole-Mounted Transformers (16)
- Switchgear (15)
- Energy Storage Systems (16)
- Liquid-Cooled ESS (14)
A compact substation packs medium-voltage switching, the transformer and low-voltage distribution into one factory-built, factory-tested enclosure that is set down on a plinth close to the load. Millenium builds European-style three-compartment boxes with a ring main unit, an oil-immersed or cast-resin transformer and an LV board; American-style pad-mounted packages with integrated switching; and photovoltaic and wind step-up ("booster") substations that take inverter output up to 10–35 kV for grid connection.
Ratings run from 50 kVA to 5,000 kVA at 10, 11, 12, 15, 20, 22, 24, 33 and 35 kV, built to IEC 62271-202 with the enclosure class, IP rating, anti-condensation heating and corrosion protection the climate calls for. Containerised and skid-mounted variants suit mining, construction and temporary power.
Compact & Box-Type Substations — product list
Compact Substations
Compact Three-Phase Package Substation (11–36 kV)
- Input Voltage: 11 kV / 33 kV / 35 kV / 36 kV
- Output Voltage: 400 V / 415 V
- Frequency: 50 / 60 Hz
Compact Substations
Compact Box-Type Substation, 750 / 1000 kVA, 10/0.4 kV
- Rated Capacity: 750 kVA / 1000 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
Customizable 1250 kVA European Box Substation, 20/0.4 kV
- Rated Capacity: 1250 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
200 kVA Compact Box Substation, 15/0.4 kV
- Rated Capacity: 200 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
630 kVA / 33 kV Compact Distribution Substation
- Rated Capacity: 630 kVA
- Rated Voltage: 33 kV
- Frequency: 50 / 60 Hz
Compact Substations
Integrated Converter-Booster Unit for Energy Storage (10/15 kV)
- Input Voltage: 380 V
- Output Voltage: 10 kV / 15 kV
- Frequency: 50 / 60 Hz
Compact Substations
800 kVA EEU-Standard Compact Box Substation (15/0.4 kV)
- Rated Capacity: 800 kVA
- Frequency: 50 Hz
- Phase: Three Phase
Compact Substations
12 kV Prefabricated Container Substation
- Input Voltage: 12 kV
- Output Voltage: 400 V
- Frequency: 50 / 60 Hz
Compact Substations
12–36 kV Prefabricated Container Substation
- Input Voltage: 12 kV / 24 kV / 36 kV
- Output Voltage: 400 V / 415 V
- Frequency: 50 / 60 Hz
Compact Substations
600 / 800 kVA Movable Complete Box Substation (25 kV)
- Rated Capacity: 600 kVA / 800 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
Aluminium-Coil Photovoltaic Container Substation (12–36 kV)
- Input Voltage: 12 kV / 24 kV / 36 kV
- Output Voltage: 400 V / 415 V
- Frequency: 50 / 60 Hz
Compact Substations
50–3150 kVA Three-Phase Power Box / Container Substation
- Rated Voltage: 35 kV
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
Movable 3150 kVA 6.3/0.8 kV Prefabricated Container Substation
- Rated Capacity: 3150 kVA
- Input Voltage: 6.3 kV
- Output Voltage: 800 V
Compact Substations
35/10 kV New-Energy Prefabricated European Box Substation
- Input Voltage: 35 kV / 10 kV
- Output Voltage: 440 V
- Frequency: 50 / 60 Hz
Compact Substations
Photovoltaic & Wind Power Box-Type Substation (10/0.4 kV)
- Input Voltage: 10 kV
- Output Voltage: 400 V
- Frequency: 50 / 60 Hz
Compact Substations
Hua-style Photovoltaic Boost Prefabricated Substation (35/0.4 kV)
- Input Voltage: 35 kV
- Output Voltage: 400 V
- Frequency: 50 / 60 Hz
Compact Substations
1600 kVA 12/0.4 kV Compact Box Substation
- Rated Capacity: 1600 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
750 / 1000 / 2550 kVA American-style Compact Substation
- Rated Capacity: 750 kVA / 1000 kVA / 2550 kVA
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
10/0.4 kV PV Inverter Boosting Box Substation (America Type)
- Input Voltage: 10 kV
- Output Voltage: 400 V
- Frequency: 50 / 60 Hz
Compact Substations
33 kV Containerized Substation with IEC Switchgear
- Rated Voltage: 33 kV / 35 kV
- Frequency: 50 / 60 Hz
- Phase: Three Phase
Compact Substations
1600 kVA 10/0.4 kV Prefabricated Container Box Substation
- Rated Capacity: 1600 kVA
- Output Voltage: 400 V
- Frequency: 50 / 60 Hz
Compact Substations
4000 / 5000 kVA 25–35 kV Oil-type Compact Box Substation
- Rated Capacity: 4000 kVA / 5000 kVA
- Rated Voltage: 25 kV / 35 kV
- Frequency: 50 / 60 Hz
No products match that search. Try a rating (e.g. “1600 kVA”), a voltage (“33 kV”) or a type (“ring main unit”) — or describe what you need and we will configure it.
Guides and project references for compact substations
Switchgear
Ring Main Unit vs Metal-Clad Switchgear (KYN28): Choosing MV Switchgear for a Distribution Substation
Compare RMUs and metal-clad KYN28 switchgear on IEC 62271-200 classes, fault levels, extensibility, protection and cost.
· 9 min read
Substations
Compact Substations: European vs American Style, and When Each Fits
Compares European three-compartment compact substations with American pad-mounted transformers on footprint, cost, maintenance and application fit.
· 8 min read
🇨🇱 Chile · Reference design
Chile: 33 kV Prefabricated Wind-Farm Step-Up Substation
33 kV prefabricated step-up substation — Wind-power collection system. 33 kV collector system; step-up ratio fixed against the grid connection point…
Read the project sheet →
🇵🇭 Philippines · Reference design
Philippines: 13.8 kV Island Microgrid Substation
13.8 kV containerized substation with compact transformer and switchgear — Coastal island microgrid with solar generation and local distribution…
Read the project sheet →
🇰🇿 Kazakhstan · Reference design
Kazakhstan: 35 kV/10 kV Prefabricated Substation Built for Extreme Cold
35 kV/10 kV thermally insulated prefabricated substation — Remote industrial power supply. 35 kV incoming / 10 kV outgoing, 50 Hz.
Read the project sheet →Compact Substations — frequently asked questions
What is the difference between a European-style and an American-style compact substation?
A European box has three separate compartments — MV ring main unit, transformer and LV switchboard — accessed from outside; an American-style unit is a pad-mounted transformer with the MV switching and fusing built into its own cabinet, so it is smaller and cheaper but offers less LV distribution. Millenium builds both to IEC 62271-202.
What voltage and capacity ranges do Millenium compact substations cover?
10–35 kV on the medium-voltage side and 50 kVA to 5,000 kVA transformer ratings, with 0.4 kV, 0.415 kV, 0.48 kV, 0.69 kV or 0.8 kV secondaries for distribution, industrial and inverter step-up duties.
Can the substation be delivered with the switchgear and transformer already tested together?
Yes. Each substation is assembled, wired and routine-tested as a complete unit in Shanghai, and customers or third-party inspectors can witness the factory acceptance test before shipment.
Can’t find the exact rating?
The catalogue shows typical configurations. Every product is built to order — send your single-line diagram or spec and we will quote the exact unit.