DC switchgear type RT-1

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Indoor switchgear type RT-1 is dedicated to power supplying trolleybus, tram and subway traction. Innovative solutions provide safe and easy operating and enables the switchgears to be installed in maintenance-free stations.

General characteristics

RT-1 switchgears are made with metal housing, air insulated and equipped with newest switching devices. In default configuration by-pass bar is used. RT-1 switchgear is built of following standardized panels:

  • withdrawable feeder panel, metal-clad, equipped with high-speed circuit-breaker, line test devices on a withdrawable unit with by-pass bar and disconnector with motor drive, cable terminal compartment and auxiliary circuits compartment,
  • rectifier units panel, metal-clad, equipped with bipolar disconnector with motor drive, designed for power distribution between rectifier and RT-1 switchgear. Control and measurement units for rectifier and internal load of the substation are installed in the front part of RT-1 switchgear,
  • Negative cables panel connected with busbar („-”; „+”) by disconnectors, current measurement on each cable,
  • Spare circuit-breaker panel is the same as feeder panel but without disconnector on bypass busbar and cable terminals,
  • Sectional disconnector panel, metal-clad, designed to separate main busbar into sections without by-pass bar, equipped with unipolar disconnector with motor drive.

Withrawable units contains of fixed part and trolley. Between them there are following connections:

  • Sliding to main busbar and cable terminal
  • Sliding to earthing terminal
  • plug to control and signal cable


The most important advantages of RT-1 switchgear are:

  • compact design with air insulation
  • metal-clad separation provides protection against effects of arc
  • system of interlocks preventing from connection errors
  • switching the position of trolley with door closed - locate or remote
  • barriers protecting the fixed contacts
  • newest devices installed
  • easy and safety operating
  • convenient service and maintenance
  • innovative design
  • screw connections provides easy modernization and extension

Very small size of RT-1 switchgear enables to make a savings in investment process (minimalized surface and volume of the substation building). Innovative design provides safety during operation.

RT-1/36-O DC switchgear in „Krucza” substation in Poland

  1. Auxiliary circuits compartment (PP)
  2. Circuit-breaker compartment (PW)
  3. Cable terminals compartment
  4. Main busbar compartment („-”; „+”) (negative cables)
  5. By-pass busbar compartment („+”; „-”)
  6. Main busbar compartment („+”; „-”)
  7. Withdrawable unit
    1. Trolley
    2. Drawer
    3. High-speed circuit-breaker
  8. Feeder circuits contacts
  9. Cable terminals
  10. Auxiliary circuits compartment door
  11. Circuit-breaker compartment door
  12. Auxiliary circuits compartment back door
  13. Back door
  14. Disconnector with motor drive

Technical data

Type of the switchgear RT-1
Rated voltage V 660 / 850 DC
Rated insulation voltage V up to 1000
Power frequency withstand voltage
circuit-breaker and disconnector in „SERVICE” position
circuit-breaker and disconnector in „TEST” position


Rated impulse withstand voltage of isolation
circuit-breaker and disconnector in „SERVICE” position
circuit-breaker and disconnector in „TEST” position


Rated current:   
main busbars
by-pass bar
of unit with short-circuiting switch
Rated short-time withstand current
main busbars and feeder
by-pass bar
protective circuit PE


Short-circuit peak current
main busbars and feeder
by-pass bar
protective circuit PE


Degree of protection   IP 4X
Dimensions of cubicles:   
Design   indoor
Compliance with standards   PN-EN 50123-1, PN-EN 50123-2, PN-EN 50123-6, PN-EN 60529

Product card in pdf formatDC switchgear type RT-1 plik .pdf

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