CO3 and CO4 Series

High-voltage changeover unit for rail vehicles

Sensors and high-voltage controlgear

Schaltbau C03 and CO4 Series change-over units are designed for load-free switching of electrical loads. They are applied in rail vehicles which are used in cross-border service and are operated with different high-voltage power sources.

Required control signals are generated by the corresponding Schaltbau ZH1114 Series voltage selector .


  • Load-free adjustment of electrical configurations to different networks, e.g. various train line voltages in accordance with UIC 550
  • Suitable for all UIC voltages up to 5 kV DC max.
  • Inexpensive high-voltage switch for applications requiring high
    conventional thermal current
  • Various control programmes available in accordance with the
    requirements of the European railway companies
  • Simple adaptation of control programme to new requirements


CO3, CO4
Input voltage range to UIC 5500 ... 3,000 V AC, 16 2/3 ... 50 Hz; 0 ... 5,000 V DC
Conv. thermal current Ith70 A at 70 °C ambient temperature
Control voltage US24/110 V
Power dissipationapprox. 12 W during change-over, otherwise none
Ambient temperature range Tu-40 °C ... +85 °C
StandardsEN 50124, IEC 60077, IEC 61373, UIC 550
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Electrics for rolling stock
CO3, CO4 – High-voltage changeover unit for rail vehicles