Why colocate in S3 Data Center and Bulgaria?

  • Excellent communication infrastructure
  • All the economic and trade benefits of EU membership
  • Membership in other key organizations - NATO and the World Trade Organization (WTO)
  • Affordable retail space
  • Lower energy costs
  • Resource of qualified personnel
  • Strategic geolocation between Central Europe, the Middle East and Africa, allowing foreign investors to work at minimal cost
  • Low levels of seismicity
  • Strong credit rating
  • Extended transport infrastructure - 5 international airports; 230 railway stations; 7 large river and 6 large seaports, over 830 km. highway network.
  • Representations of all major IT companies - Microsoft, Cisco, Amazon, Dell, DXC, IBM, SAP and others.
  • Presence of the main Tier1 suppliers - Level 3, GTT, Cogent, TaTa, Telia, NTT, Ti Sparkle, Vodafone and others.
  • Presence of the largest Cloud providers - AWS, Azure, Cloudflare, Cdn77, Fastly


When thinking about business opportunities beyond your country's borders, it's a good idea to consider a wide variety of factors, such as tax rates, regulatory burdens, and levels of government support. Although many investors may not be aware of this, Bulgaria provides favorable policies for business, ensuring the attraction of foreign capital, investors and talent in the country, while maintaining its own, favorable environment for local business development. 

Why choose an S3 Data Center for your Colocation?

At S3 Data Center, we offer a full range of data center services.
We have two colocation rooms, with over 5000 U operating equipment.

By co-locating your machines in our data center, you use an already built infrastructure and save costs from staff to maintain it, ensure maximum security and continuity of your business.

In times when you do not have the opportunity to physically access your equipment, our team of engineers is available to provide you with the necessary assistance - thus saving time and resources to support your business endeavors.

Why colocate in S3 Data Center?

  • Designed and constructed in line with the TIER III standard
  • Carrier-neutral data center
  • 24/7 technical support and monitoring
  • Our own/Private? warehouse with spare parts for servers
  • Preferential prices for server components
  • Interconnection with other clients and operators
  • Free installation of server and telecommunication equipment
  • Free initial software installation and configuration
  • Free 30-day non-binding test period for all services


  • PCI DSS, ISO 9001 and ISO 27001 certified
  • 24/7 qualified technical support
  • Technical capacity for diagnostics and repair of server equipment
  • Opportunity for connection to other data centers in Sofia
  • Opportunity for colocation in our closet in other data centers in Sofia
  • Distance to the nearest airport: 4.5 km
  • Freight entrance and parking for customers
  • More than 5000U running servers!

Colocation parameters

  • Temperature: ~ 21.0˚C | Humidity: ~ 50.0%
  • High quality 48U cabinets with 90% door perforation
  • 50 cm double floor with a load of up to 1200 kg / m2
  • Possibility for up to 4 x 25A fuse on the cabinet
  • Individual online electricity meters for metering of electricity consumption
  • Providing Zero-U PDU power strips and cable arrangers
  • Colocation room available for Desktop and Mining equipment
  • Possibility for private cells and colocation halls


  • Strategic location between the other data centers
  • Three independent cable routes in the data center area
  • Triple reserved cable approaches to the building
  • Presence of all local telecom operators
  • Ability to build wireless connections
  • Own DWDM ring to other data centers

Electrical parameters

  • Main power supplies from two independent substations
  • Separate substations with 2 x 1000 kVA transformers
  • Reserved diesel generator 1000 kVA (N + 1)
  • Modular redundant UPS systems 230 / 400V
  • Separate electrical panels for different power supply groups (A + B)
  • Smart monitoring of power supplies


  • High-efficiency precision air conditioning (N + 1)
  • Hot and cold areas - possibility of cooling up to 12 kW per cabinet
  • Free cooling and indirect adiabatic cooling
  • Warehouse with spare parts for HVAC systems
  • Constant monitoring of temperature and humidity


  • Video surveillance of the collocation halls and the data center
  • NFC card access control system
  • 24/7 physical security of the perimeter around the data center
  • Fire alarm system with smoke and fire sensors
  • 24-hour authorized access for customers
  • Individual locks for each cabinet
  • Service Level Agreement (SLA) - 99.99%

Our custumers