Shanghai Mars Electric Power Equipment Co., Ltd.
Transformers, Switchgear & Energy Storage — Built to Your Grid
A Shanghai-based manufacturer of oil-immersed and dry-type transformers, compact substations, MV/LV switchgear and LFP battery energy storage — engineered to IEC, ANSI/IEEE, GB and GOST standards and delivered to projects in more than 40 countries.
5 kVA – 31,500 kVATransformer range, 3 – 35 kV (110 kV class power units)
40 kWh – 10 MWhLFP energy storage, cabinets to containers
ISO 9001 · 14001 · 45001CE · UDEM · EAC · CQC certified
50 & 60 HzIEC, ANSI/IEEE, GB and GOST designs
Product lines
Nine product families, one factory
From single-phase pole-mounted units to 110 kV power transformers and megawatt-hour storage containers — every product is wound, cast, fabricated and tested in-house.
Transformer Substations
Box-type, compact and containerised substations, 10–35 kV, up to 2,500 kVA — European and American style.
23 products →
Oil-Immersed Transformers
S11 / S13 / SH15 hermetically sealed and conservator-type distribution transformers, 10–35 kV, 100–4,000 kVA.
19 products →
Dry-Type Transformers
Epoxy-resin cast SCB series transformers, 6.3–22 kV, class F/H, for indoor, building and industrial installations.
16 products →
Energy Storage Systems
Lithium iron phosphate battery energy storage containers with integrated PCS, BMS/EMS and fire suppression, 500 kWh to 10 MWh.
16 products →
Pole-Mounted Transformers
Single-phase and three-phase pole-mounted distribution transformers with CSP protection, 5–500 kVA, IEC and ANSI designs.
16 products →
Power Transformers
Two- and three-winding oil-immersed power transformers for substations, industry and renewable step-up, up to 31.5 MVA / 110 kV.
16 products →
HV & LV Switchgear
Metal-clad MV switchgear (KYN28), SF6 ring main units and IEC 61439 low-voltage boards (GGD, GCS, MNS).
14 products →
Liquid-Cooled ESS Cabinets
Outdoor liquid-cooled LFP energy storage cabinets, 93–372 kWh, for commercial and industrial peak shaving and solar self-consumption.
12 products →
Pad-Mounted Transformers
ANSI/IEEE C57.12 dead-front pad-mounted transformers, single-phase 37.5–167 kVA and three-phase up to 2,500 kVA, loop or radial feed.
5 products →Why buyers choose MARS
Engineered and built under one roof
Own 25,000 m² plant
CNC copper winding, vacuum resin casting, vapour-phase drying, in-house sheet-metal and powder coating, and dedicated assembly lines for four product groups.
Tested before it ships
Routine tests on every unit — ratio, winding resistance, insulation, losses, withstand voltage, partial discharge. Type tests and customer or third-party FAT on request.
Certified for four regions
CE (ECM) for the EU, UDEM attestation for Türkiye, EAC declaration for the Eurasian Union and CQC for China — plus ANSI/IEEE-style designs for the Americas.
Built to specification
Capacity, voltage ratio, vector group, winding material, insulation class, enclosure IP and cooling are all configurable. Send the grid and the site; we build to match.
Featured equipment
Popular configurations
11/33kV Three-Phase Oil-Immersed Power Transformer (1000kVA–10MVA, Copper Winding)
- 1000kVA – 10MVA
- 11 kV / 33 kV
- 415 V
- 50 / 60 Hz
1600kVA 22/0.415kV Three-Phase Cast Resin Dry-Type Distribution Transformer
- 1600 kVA
- 22 kV
- 415 V
- 50 / 60 Hz
LiFePO4 Containerized BESS, 1MWh–6MWh / 1000kW (Liquid-Cooled, IP67)
- 1MWh / 5MWh / 6MWh
- Liquid Cooling
15/16/25/37.5/50kVA Single-Phase Pole-Mounted Toroidal-Coil Distribution Transformer
- 15 / 16 / 25 / 37.5 / 50 kVA
- 7.2 kV (or custom)
- 380 / 220 V (or custom)
- 50 / 60 Hz
110–115 kV Three-Phase Oil-Immersed Power Transformer 20–50 MVA with OLTC
- 20 / 25 / 50 MVA
- 110 / 115 kV
- 11 / 23 kV
- 50 / 60 Hz
1000V Low Voltage Withdrawable Switchgear Panel (1600A, IP65, Galvanized Steel)
- 1 kV
- 1600 A
- 50 / 60 Hz
Our factory
Made in our own workshops, not sourced and re-badged
Our Shanghai plant runs four connected production lines under one roof: transformer winding and assembly, switchgear and cabinet fabrication, compact substation and container integration, and energy storage assembly.
- Oxygen-free copper wound on CNC machines for foil and wire coils
- Cast-resin coils vacuum-cast and cured in-house; oil-immersed cores vapour-phase dried
- Tanks and enclosures cut, folded and powder-coated on our own sheet-metal line
- Every unit routine-tested and crated in fumigation-free wooden cases
Projects & configurations
Where MARS equipment goes to work
A delivered 33 kV/11 kV substation in Nairobi, plus representative configurations for fourteen typical markets and applications.
33 kV/11 kV Distribution Substation
A 33 kV/11 kV step-down point in a growing city carries two competing demands. It has to absorb load growth without repeated outages, and it has to fit into a constrained urban plot alongside existing feeders.
33 kV/13.8 kV Solar Transformer Bay
A transformer bay at a Saudi photovoltaic plant works in three conditions that a general-purpose distribution unit is not designed around.
2 MWh Liquid-Cooled Containerized BESS
A battery system connected in Germany faces a regulatory environment that is stricter and more explicit than most, and the specification has to be built around it from the start rather than adapted afterwards.
Compliance
Certified management system and product approvals
Insights
Engineering guides for buyers and specifiers
Single to 3 Phase Transformer: Engineering & Sizing Guide
Learn how single to 3 phase transformer systems work, how to size 220V conversion equipment, calculate input amps, and configure balanced industrial power.
DGA Oil Test Guide: Transformer Fault Diagnosis & Limits
Master the DGA oil test for transformers. Learn dissolved gas limits, ratio interpretation to IEC 60599 and IEEE C57.104, sampling methods, and diagnostic steps
MVA to kVA Calculator: Formula, Sizing & Substation Guide
Use this MVA to kVA calculator guide and conversion formula to calculate transformer capacities, full-load currents, and substation switchgear ratings.
About MARS
Global Power, Trusted MARS
MARS — Shanghai Mars Electric Power Equipment Co., Ltd. — manufactures transformers, switchgear, compact substations and battery energy storage systems for utility, industrial, commercial and renewable-energy projects in more than 40 countries. From 5 kVA distribution units to 31,500 kVA power transformers, and from 40 kWh storage cabinets to 10 MWh liquid-cooled containers, every product is engineered to IEC, ANSI/IEEE, GB or GOST standards and backed by ISO 9001, ISO 14001 and ISO 45001 certified manufacturing.
Questions buyers ask first
What does MARS manufacture?
Oil-immersed and cast-resin dry-type distribution transformers, power transformers up to 31,500 kVA / 110 kV class, pad-mounted and pole-mounted transformers, compact and containerised substations, MV/LV switchgear and ring main units, and LFP battery energy storage from 40 kWh cabinets to 10 MWh containers.
Which standards and certifications do your products meet?
Designs follow IEC 60076 and IEC 62271, with ANSI/IEEE, GB and GOST variants. The factory is ISO 9001, ISO 14001 and ISO 45001 certified; products carry CE (ECM), UDEM attestation, EAEU EAC declaration and CQC certification.
What is the minimum order quantity?
One unit. Most transformers and switchgear are built to order, so a single custom-specified unit is normal; container BESS and substations are quoted per project.
How long is delivery?
Distribution transformers and switchgear typically ship 25–45 days after drawing approval; power transformers 60–90 days; containerised BESS 60–90 days. Sea freight from Shanghai adds 2–6 weeks depending on destination.
Can I visit the factory or witness testing?
Yes. Factory visits and witnessed factory acceptance tests (FAT), by you or a third-party inspector such as SGS, TÜV or BV, are welcome by appointment.
How do I get a quotation?
Add products to the quote list and send it, use the contact form, or email inquiry@electrical-equipment-factory.com with the rating, voltage ratio, frequency, standard, quantity and destination. An engineer replies within one working day.
Send us the grid and the site. We build the equipment to match.
Share your voltage ratio, capacity, frequency and destination — you will get a technical proposal and quotation, not a form reply.