Circuit breakers are special switches that are designed for high currents. As opposed to load(-disconnector) switches they can not only switch operating currents and overload currents, but they can also trip in cases of high overload current and short circuit current errors, hold these fault currents for a specified time, and safely switch off. In the medium voltage range, circuit breakers have a three-phase design. Usually the clearance between open contacts is integrated in a vacuum chamber, which means high switching capacities can be safely controlled in a compact space.
PTV01 for gas-insulated switchgear
Because of the arrangement of the circuit breaker poles vis-a-vis the switch operating mechanism, extremely small switch panel constructions are possible. As such, a 36kV switch panel with a maximum rated operating current of 630A can be realized with a panel width starting at only 450mm.
VL2G for gas-insulated switchgear
The VL2G circuit-breaker is the successor of the PTV01. The proven vacuum switching technology and the compact construction of the stored-energy spring-operated circuit-breaker were retained and the electrical parameters enhanced using modern vacuum switching chambers and a new switch pole construction.
VL3G for gas-insulated switchgear
The VL3G circuit-breaker is the successor of the VL2G. The proven vacuum switching technology and the compact construction of the stored-energy spring-operated circuit-breaker were retained.