THJB-1000/25 high-voltage earthing switch
   Nominal voltage: 25kV
   Rated voltage: 33kV
   Rated current: 1000A
   Short-time withstand current: 20kA/1s
   Mechanical service life: 20000 times

   This product is of safety protection device, in case that maintenance staff climbs up to roof for inspection or maintenance, main circuit at both side of locomotive circuit breaker will be earthed by earthing switch, main circuit of locomotive will be kept as powered off, so that safety of maintenance staff will be ensured.
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