Switchgears for mining industry PREM-GO series

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PREM-GO flameproof switchgear is dedicated for electrical energy distribution in alternating current grids with rated frequency of 50 Hz and operating voltage up to 10 kV. Primarily in underground mining plants.


PREM-GO flameproof switchgear is designed for methane-free and methane areas, mining headings classified under methane explosion and coal dust explosion hazard categories.
Equipment will automatically trip-off in case if allowed methane gas concentration will be exceeded.

General characteristics

PREM-GO flameproof switchgear is indoor, stationary, free-standing, draw-out type, double compartmented switchgear, which consists of PREM GO** cubicles. The insulated bulbar system of this air-insulated switchgear contains IZP Ex type busbar-bushing insulators and IZM Ex type spout insulators manufactured by ELEKTROBUDOWA SA.
Switchgear cubicle is electrical-arc resistant (pressure rise), occurring inside the enclosure in case of eventual arc fault.
Flameproof enclosure withstands the explosion pressure and effectively prevents the explosion distribution to the outside of the enclosure without damage and permanent deformation of the cubicle.


  • compact cubicle size and small dimensions,
  • IP 54 enclosure protection degree,
  • operational safety through the elimination of switching faults by mechanical and electrical interlocking system,
  • operation surety provided by reliable vacuum or SF6 switching devices,
  • motorized drives of the withdrawable part and earthing switch (option),
  • convenient switching operations with closed compartment door,
  • metallic shutters automatically separates the fixed contact while the withdrawable part is being retracted to the test position,
  • full visualization of monitoring the operating and emergency conditions, including the possibility to measure, record and review events,
  • possibility of control by the supervision system,
  • reduction of the maintenance activities resulting with shorter shut downs,
  • switching-connection compartment doors can be opened without necessity of unscrewing of the fixing bolts, this is a distinctive feature of the PREM-GO flameproof switchgear among other products offered on the market,
  • variety of modern protective relays application for example MUPASZ 710 or multiMUZ-3 ensuring:
    • complete current and voltage protection features,
    • metering of voltage current and energy demand,
  • unique combined drive of the withdrawable part and earthing switch utilized in the outgoing cubicles ( simultaneous movement of the withdrawable part and earthing switch contacts).


  1. auxiliary circuits compartment
  2. busbar compartment
  3. withdrawable part & cable connection compartment
  4. busbar bushing insulator
  5. busbar spout insulator
  6. withdrawable part (circuit breaker, contactor, busbar link)
  7. earthing switch
  8. transformer
  9. sight-glass
  10. surge arrestors, optionally vacuum short circuiting switch
  11. current transformers
  12. cable bushings of the withdrawable part & cable connection compartment
  13. auxiliary circuits compartment cable bushings
  14. isolative flameproof bushings
  15. busbar compartment access cover
  16. earth-fault transformer
  17. moving shutters

Technical data

Type of the switchgear PREM-GO **
Rated voltage kV  7,2/12
Power frequency withstand voltage kV  20/38
Lightning impulse withstand voltage kV  60/75
Rated current:   
normal of main busbars
witch a circuit breaker
witch a contactor
short-time withstand current
peak withstand current
up to 1250
up to 1250
up to 400
up to 25/1
up to 63
Internal arc withstand current kA/s 25/0,3
Rated frequency Hz 50 
Degree of protection   IP 54
WE type test certificate   KDB 12 ATEX 0091X
Explosion proof design marking   I M2 Ex [ia, Ma] d I Mb
Dimensions of cubicles:    
width [A]
height [B]
depth [C]
Internal Arc Classification   BFLR
Compliance with standards   PN-EN 60079-0, PN-EN 60079-1, PN-EN 60079-11, PN-EN 60079-28

Exemplary schematic diagrams

Product card in pdf format Switchgears for mining industry PREM-GO series plik .pdf

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