The quality of power supply stands for an immediate influence to the availability of electronically interlocking systems. The electronically interlocking ZSB 2000 use 60V DC. With using modern technology the capacity of power supply could be minimised extensively. Power reserve will be provided by battery for all elements. Switch points are controlled via inverted rectifier. For base power and maintenance of battery is a corresponding battery charger in use. Scheidt & Bachmann continue with Digitrans II the tradition of a high functional battery charge. Compact construction, low weight, high efficiency and energy-saving measure characterise this innovative product.