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Did you know that STALCO SA is one the oldest manufacturers of Fuse Boxes (Pillars). For more than 30 years we have been supplying the Greek Public Power Corporation with Fuse Boxes with metallic enclosures that have been in operation, trouble free, for all this time.Link to Panels

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Medium Voltage Fuse Cutouts PDF 
Did you know that STALCO SA is the only Greek manufacturer of medium voltage fuse cutouts in Greece. In fact, we are the company that has won the most recent tender for the supply of fuse cutouts with porcelain inslulators.Link to Panels
Generator Stator PDF 

  Γεννήτρια1  Γεννήτρια 2

  Γεννήτρια 3  Γεννήτρια 4

 Manufacture of Generator's Stator for Thermoelectric Power Stations up to 300 MW.


 pdf logo Click here to download the relevant project reference list of stators made by STALCO SA


Prefabricated buildings PDF 

  Prefabricated buildings   

  Prefabricated buildings with unit frame made of special section of galvanized steel or hollow sections, WBP plywood flood paved with ceramic tiles or plastic flooring, side and partition walls and roof made of thermo insulating panels and windows and doors made of aluminium.

  The building process allows the extension and modification of all the spaces based on our client's demands.

  All units are designed to fulfill all the statical, antiseismic, water proofing and aesthetic requirements.

  The production process is carried out in our 15.000 sq meter industrial buildings in the industrial area of Volos.

  The total service provided by our company includes the project planning, design, construction, transportation, installation and, if necessary, the cubicle maintenance.

  Some examples of the uses of the buildings are:

  • Bulletproof guardhouses.
  • Outdoor electrical distribution substation.
  • Cubicles for photovoltaic parks with or without equipment.
  • Cellular telephony units.
  • Television transmission units.
  • Flat pack units.
  • Heavy machinery control booths.

PDF logoClick here to download the brochure

24kV/400A(630A) Metal enclosed panels PDF 
Πινακες Μ.Τ

  STALCO-MIX Medium voltage metal enclosed panels

  The panels are manufactured in STALCO's factory and utilize the ABB SHS2 family of switchgear.

  We produce different type of panels (with fuses, motorized, with instrument transformers etc) according to our customers' specifications.












  The Stalcomix series of 10kA arc proof, metal enclosed switchgear according to IEC 62271-200 uses Sulfur Hexafluoride (SF6) insulated switchgear of 24kV nominal voltage, which are intended for indoor installation for the distribution network.

  The panels are equipped with a system that handles the safe escapement of the pressure that may develop in the highly unlikely event of internal arc. The expanding gas escapes safely to the top through a special duct that is located on the back. This system is capable of operating on its own and is not depended on the surrounding walls.

 A mechanical interlock system has been developed that:

•    Does not allow the closing of the breaking device while the earthing device is closed and vice versa.

•    Does not allow the opening of the cable compartment door if the earthing device is open.

•    Does not allow the closing of the breaking device when the cable compartment door is open.

  All these interlocks are carried out by a metallic mechanism that blocks the operation of the breaking or/and earthing device. That does not allow the incorrect operation sequence eg an attempt to close the earthing device while the breaking device is closed.

  The panels are made using a special galvanized sheet metal. The front doors and coverings are additionally protected by coats of electrostatic paint of at least 40um thickness. The SF6 insulated switchgear external cover is made of stainless steel sheet. All of the above ensure extra high resistance to corrosion even in polluted environments.

  Operating Conditions

Minimum ambient air temperature    :-5°C

Maximum ambient air temperature    : +40°C

Ambient air temperature (average value measured over a period of 24 hours)    : +35°C

Relative humidity (average value measured over a period of 24 hours)    :95%

Maximum altitude    : 1000m over sea level

  Electrical Characteristics

Rated Voltage: 24kV

Rated insulation level: 50kV/1min, 125kV BIL

Main Circuit Rated Current: 200A, 400A, 630A

Rated short time withstand current: 10kA/1sec or 16kA/1sec

Internal Arc withstand: 10kA/1sec or 16kA/1sec

Dergee of protection of metal enclosure: IP 3X

Type Test Reports

STALCO has sucefully passed all the type test for our products.

Type test certificate Type test certificate Type test certificate Type test certificate Type test certificate


pdf logo Click here for product brochure    

pdf logo Click here for installation instructions    

H.V. Disconnector PDF 
HV disconnector

  420kV Outdoor, knee type, single pole, AC disconnector with electric motor operating mechanism












  The disconnector is single-pole, knee type with a two piece folding blade and two cylindrical post insulators installed on a common hot dip galvanized steel base, one rotating insulator and integrated earthing switch.

  The two cylindrical post insulators are equipped with corona rings in order to level off the electric field. The rotating insulator rotates in order to transmit the motion to the blade securely.

  The operating mechanism of the disconnector is driven by an electric motor via metallic gearwheels and can be operated locally and remotely.

  There is also a manual emergency operation that is carried out via rotary motion and reduction gears using a hand-handle.

  The operating mechanism is equipped with auxiliary switches.

  The extra heavy aluminum arm consists of two pieces and in the open position folds upon itself in a vertical position. Counterbalancing springs are used to balance the weight of the movable parts.

  All the contacts used are made of silver plated copper, are replaceable and self cleaning and are designed so that short circuit currents increase their contact pressure. When in the closed position they are able to withstand seismic and wind forces, forces exerted by the tension of the wires and due to temperature variations.

  A flexible tin plated copper strip is used to earth the disconnector to the substation earthing.

  The earthing switch is single pole and linked directly to the disconnector and can be electrically or, in case of emergency, manually operated.

  The disconnector, when installed, is mounted on a steel structure as shown in the attached schematics. STALCO SA has been producing this type of disconnector for many years.

  Throughout all this time they have operated optimally and without problems in the field. The product has been type tested according to the relevant EC standards (EC 62271-102 & EC 60694).

  The production facilities include a state of the art testing laboratory in which the required routine tests are conducted to each disconnector.

  The design and integrated equipment of the disconnector can be adapted according to our clients' requirements.


Installation: Outdoors

Ambient air temperature: max +45°C, min -24°C

Altitude: Up to 1000m above sea level

Relative humidity: <95%

Ice coating: max 20mm

Pollution level: moderated to heavy

Wind speed: 150km/h

Other conditions: Snow and fog


Rated voltage: 420kV

Rated frequency: 50Hz

Rated nominal current: 3150A

Rated short time withstand current: 40kA rms

Rated peak withstand current: 100kVrms

Rated short circuit duration: 3sec

Rated power frequency voltage withstand levels: 620kV (phase to earth)/800kV(isolating dist)

Rated switching impulse voltage withstand levels: 900 (+450) kV (isol. dist), peak (dry) /1050kV peak (phase to earth)

Lightning impulse withstand voltage: 1550kV peak (phase to earth)/1550 (+315) kV peak (isol. dist.)

Mechanical endurance class: M1 (2000 operating cycles)

pdf logo Click here for product brochure     

2000A/24kV disconnectors PDF 

2000A/24kV Disconnectors










  The medium voltage (24kV), 2000A, vertical break, manually operated disconnector is used in 20kV/24kV overhead distribution lines for isolation purposes according to IEC 62271-102 & IEC 60694 (IEC 62271-1) standards. Τhey are installed at both sides of the main 150/20kV substation circuit breaker.

  They are manufactured in order to withstand the harshest environmental conditions and high pollution levels. The base of the disconnector and all non current carrying parts are made by formed hot dip galvanized steel.

  The insulators are made of high quality brown porcelain.

  The disconnector's contacts, terminals and blade are made of tin-plated copper.

  The contacts are self cleaning and always maintain constant pressure and once secured in the closed position can withstand  seismic, wind and other vibrational forces without opening.


  All screws, nuts and washers are made of hot-dip galvanized steel to ensure long and trouble free operation.

  This type of disconnector has been manufactured by our company for more than 20 years. Our products have been operating trouble-free in the Greek power grid throughout all this time.

  The disconnectors can operate under the following conditions:

Ambient temperature (oC): from -25 to +45

Altitude from sea level(m): 1000

Relative humidity: less than 95%

Ice coating (mm): max 10

Pollution level: moderate to heavy

Wind speed: 150km/h

Electrical characteristics

Rated voltage(kV):20

Maximum voltage(kV):24

Rated frequency(Hz):50

Rated current(Α):2000

Short circuit level: 10kA(rms) / 25kA(peak)

Short circuit duration(sec): 3

Insulation level(kV): 24/50(60)/125(165)

Mechanical endurance: 1000 operations

Type test reports

 Our products have sucessfully been type tested and have been awarded the relevant type test certificates.

Type test certificate


pdf logo  Click here for product brochure



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