Drawout switchgears PREM-14SM series

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Distribution of three - phase alternating current electrical energy with nominal frequency 50 Hz and nominal voltage up to 12 kV.


  • in electricity distribution networks and industrial plants,
  • in secondary distribution,
  • in industrial plants,
  • in unmanned distribution substations.

General characteristics

  • indoor drawout switchgear, air - insulated,
  • free standing or wall mounted,
  • metal - clad, with metallic partitions and a single system of bus bars,
  • equipped with the system of quick breaking of arc fault,
  • cubicles fulfill the requirements of standards in arc protection inside the enclosure,
  • wide range of solutions for main circuit cubicles, tailored to the needs of power stations, thermal power plants and industrial buildings,
  • metal enclosure provides the degree of protection IP 4X,
  • possibility of remote control and surveillance in PREM-14SM switchgear (electrical drive operation).


  • operation and design proven in many sites,
  • resistant to the effects of internal arcing,
  • electromechanical interlock which prevents closing the earthing switch when its fixed contacts are live,
  • convenient switching operations with closed door,
  • guarantee of proper switching operation owing to the system of interlocks eliminating faults,
  • safety for the operating staff,
  • possibility of carrying out repair and maintenance works within the unit without a need to de-energise the bus bars of the switchgear,
  • high voltage indication in each cubicle,
  • convenient access to connect cables and apparatus,
  • minimal inspection and maintenance requirements,
  • environment friendly production and operation,
  • producer's professional service,
  • perfect quality finish (painted or galvanized),
  • modern production methods which incorporate digitally controlled machines ensure the correctness of assembly and repeatability of parts,
  • suitable for vacuum or SF6 switching devices and advanced digital protection systems,
  • easy installation and provisions for extension of the auxiliary circuits compartment,
  • possibility of remote control and visualization of operations and failures, recording and review of events,
  • long life expectancy and aesthetic design.

Front view and cross-section of the outgoing circuit breaker cubicleFront view and cross-section of the outgoing circuit breaker cubicle Front view and cross-section of the incoming cubicleFront view and cross-section of the incoming cubicle


  1. protection equipment relay system
  2. busbar bushing
  3. bushing with contacts
  4. busbars
  5. withdrawable part
  6. pressure relief flaps
  7. current transformers
  8. voltage transformers (transformer)
  9. earth fault transformer
  10. earthing switch
  11. motor drive mechanism of the earthing switch
  12. motor drive mechanism of the withdrawable part
  13. surge arresters

Technical data

Type of the switchgear PREM-14S; PREM-14SM
Rated voltage kV 7,2 12
Power frequency withstand voltage kV 23 32
Lightning impulse withstand voltage kV 70 85 
Rated current:    
short-time withstand current
short-time withstand current
peak withstand current
up to 3150
up to 40/1
up to 31,5/3
up to 100
Internal arc withstand current kA/s up to 40/0,1
Rated frequency Hz 50/60
Degree of protection   IP 4X
Dimensions of cubicles:    
width [A]
height [B]
depth [C]
650 ÷ 900
1450, 1750
Internal Arc Classification     AFLR
Loss of Service Continuity Classification     LSC2B
Compliance with standards     PN-EN 62271-200; PN-EN 62271-1

Exemplary schematic diagrams

Product card in pdf format Drawout switchgears PREM-14SM series plik .pdf

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