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This time distribution system, as its name suggests, uses 220 volts mains power. No batteries or accumulators.
Specialists in monumental timepieces sometimes used this system, as 220 volts provided a powerful source of energy to drive the electric motors of the large hands on the façade.
Of course, there remained the problem of power failure. Several manufacturers solved this problem in various ways, notably Lambert Huchez (screw memory), or Bürk in Germany, which memorized the mains failure using a chain and counterweight principle with a limit switch to automatically reset the receivers.
Ref: MJOIYPSV1V