The electricity supply to railway systems calls for circuit breakers with special characteristics. Not only are single or two-pole circuit breakers usually needed for supplying traction current, the stringent demands for operational safety and number of switching sequences also far exceed those of regular applications. In addition, using single-phase rail systems creates tougher demands in terms of dielectric strength.
The 3AH7 vacuum circuit breakers comply with standard EN 50152-1 and are therefore perfectly suited for use in rail applications involving grid frequencies of 16.7, 25, 50 or 60 Hz. Depending on the version, they can be used as master vacuum switches on locomotives or for stationary traction current supply. Depending on the version, the 3AH47 vacuum circuit breakers can handle up to 60,000 switching sequences. Their compact design means the control panels can be narrower.