HV indoor switchgear type OPTIMA 145

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OPTIMA 145 switchgears is designed for operation in distribution networks of electric energy with frequency 50 Hz and nominal voltage to 123 kV.


The increasing demand for electric energy in the cities, industrial centers and extension of existing electrical power infrastructure requires to install
the small overall dimension switchgear with high reliability parameters.

General characteristics

  • indoor,
  • metal-enlosed (separate compartments),
  • with SF6 gas insulation,
  • circuit breaker with spring-loaded operated mechanism,
  • with single or double bus-bars system.


  • high safety ensured by:
    • construction designed to protect against effect of internal arcing,
    • application of interlocks between disconnectors and earthing switches which eliminate switching mistakes,
    • application of HV circuit breaker modern design which ensures effective operation in all operating conditions,
  • switchgear enclosures made of die cast aluminum,
  • reduced to minimum maintenance and service during switchgear operation,
  • application of modern switching apparatus,
  • very easy access to the drives,
  • the ability to adjust the product configuration to the requirements of the customer,
  • comprehensive project realization (factory tests, supply, installation, assembly tests),
  • possible to use a wide range of parameters for current and voltage transformers,
  • the possibility of using local control cabinet LCC type enclosures, wall-mounted, free-standing or mounted on the switchgear.

Construction of the switchgear

  1. circuit breaker operating mechanism
  2. circuit breaker
  3. disconnector and earthing switch operating mechanism
  4.  bus-bars system
  5. current transformer
  6. voltage transformer
  7. fast earthing switch
  8. fast earthing switch operating mechanism
  9. disconnector and earthing switch
  10. disconnector and earthing switch operating mechanism
  11. voltage transformer insulating switch
  12. cable terminal

Example bay configurations


Technical data

Type of the switchgear OPTIMA 145
Rated voltage kV 123
Power frequency withstand voltage kV 230 (phase to earth, between phases)
265 (across the isolating distance)
Lightning impulse withstand voltage kV 550 (phase to earth, between phases)
630 (across the isolating distance)
Rated frequency Hz 50
Rated current:    
short-time withstand current
peak withstand current
up to 3150
up to 40 
up to 100
Time duration s 3
Pitch cubicle mm 800, 1000
Partial discharge level pC <=5
Annual SF6 gas leakage ratio %/year <=0,5
Ambient temperature range °C from -25 up to +40
Compliance with standards   PN-EN/IEC 62271-1; PN-EN/IEC 62271-203
More information is available on request


Exemplary schematic diagrams


Product card in pdf format HV indoor switchgear type OPTIMA 145 plik .pdf

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