Circuit breakers with lateral mechanical drive (spring mechanism) for medium voltage distribution networks up to 24 kV, 1250 A, 25 kA. VD4 / R circuit breakers with lateral drive can be used in all medium voltage distribution systems, as well as in transformer substations in industrial facilities and enterprises in the service sector. Thanks to the installation (upon request) of an overcurrent release with a PR521 microprocessor unit with autonomous power supply, VD4 / R circuit breakers are suitable for use at unattended HV / MV transformer substations, without auxiliary power supply for their own needs.