Compact Substation (C.S.S.)

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As one of the leading compact substation manufacturers in India, we specialize in providing safe, reliable, and space-saving power distribution solutions through our range of UniPack compact secondary substations (CSS) up to 36 kV. Our product range includes 11kV and 33kV compact substations, as well as ABB compact substations, which are available in our ABB compact substation catalog. We also offer compact package substations and compact secondary substations to cater to the diverse needs of our customers.

Our compact substation solutions offer numerous advantages, including lower installation and maintenance costs, reduced footprint, and improved safety. Our compact substation price in India is highly competitive, and we are committed to delivering high-quality products and exceptional customer service. Whether you’re looking for 11kV 433v 1250 kVA compact secondary substation (CSS) or 15kVA compact substation solutions, we have got you covered.

As one of the leading compact substation suppliers in the country, we take pride in delivering high-quality products and services that meet the unique needs of our customers. Contact us to learn more about our compact substation solutions and how we can help you optimize your power distribution system.

Technology Advantage

CSS is a prefabricated substation, factory-designed, tested and ready-to-install and is fully compliant with IEC 62271-202 (IEC 61330). Our compact substations are engineered to the highest possible standards for personnel safety and aesthetics, designed to help solve problems of footprint and space limitations experienced within dense urban load centers. ABB’s CSS has the highest installation base in India as well as around the world.

Salient Features

Product Portfolio

Outdoor CSS for secondary distribution up to 36kV configuration

Outdoor CSS for wind power evacuation at 36kV configuration

Indoor frame mounted CSS for secondary distribution up to 24kV configuration

Advanced construction for CSS enclosure

The enclosure of the outdoor CSS is manufactured using high quality pre-galvanized sheet steel.This provides high resistance to corrosion, which is paramount in outdoor applications. CSS is typically divided into three compartments for – medium voltage switchgear, low voltage switchboard and distribution transformer. The detachable roof with ventilation opening is beam supported and secured at each corner with bolts.

Modular construction

The enclosure’s wall units, roof and doors are constructed using standard modules. Its limiting dimensions are 3830 x 2330 x 2415 mm (L x W x H)


Clinching technology

Self-interlocking modules are inter-connected using clinching technology. All load bearing members are of 2 mm thickness and non-load bearing members are 1.5 mm thick.

Bolting is used only for the base frame and lifting fittings.



Enclosure is painted with polyurethane paint.



Ventilation is achieved by means of natural air circulation from the louvers of wall/door to the top of the roof using thermo siphon effect. Sufficient cooling of distribution transformers is achieved by means of ventilation openings in the transformer compartment, which is designed taking into consideration the transformer rating, losses and climatic conditions. A standard CSS is classified and type-tested in accordance with enclosure class requirement.

Doors and locking system

All compartment doors are fixed with stainless steel hinges, which provide high mechanical strength. Press-fit type gaskets ensure IP protection. Locks are equipped with concealed shooting bolt arrangement and complete with a magnetic flap. A padlock is also provided to protect against vandalism.

Flexible electrical composition

Medium voltage switchgear

The MV compartment can be equipped with SF6 insulated compact Switchgear Type Safe Ring upto 36kV.

For 36kV Compact Secondary Substation, air insulated switchgear with vacuum circuit breaker can also be offeredAdvanced

Distribution transformer

Oil-type transformer

Oil-insulated transformer can be provided with CSS up to 36kV. Fully hermetically sealed transformer with low losses and low temperature rise are used in CSS.


Dry-type transformer

Dry-type transformers can be provided with CSS up to 24kV


Low voltage switchboard

A fully customized solution type-tested as per IS/IEC standards is provided as per customer requirements. The low voltage switchboard can be designed in different arrangements and configurations in order to suit a specific application with required equipment such as:

Internal earthing

The earthing of the CSS is made by 50 x 6 mm GI strip. The continuity of earth system is ensured taking into account the thermal and mechanical stresses.

Connection between equipment

Personnel and equipment safety is the major concern. In order to ensure complete safety of equipment used in a CSS, especially the transformer bushings, the connection between the transformer and the RMU is made with XLPE insulated cables. The connection between the transformer and LVDB is made with cable / busbar.


Optional features