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Its the 3AP1 and its the most powerful high-voltage circuit-breaker with a spring-stored energy operating mechanism from Siemens. We offer live tank circuit breakers for applications from 72.5 kV to 1100 kV, up to 80 kA, suitable for all different types of applications, For the application of 362 kV to 550 kV the circuit-breakers can be equipped and distribution company 2 With High-Voltage Circuit-Breakers from SiemensConsult Siemens High-voltage – Power transmission's entire 3AP1 FG 145 kV Circuit Breaker catalogue on DirectIndustry. Page: 1/6. 3AP circuit breaker family is available for rated voltages from 72.5 kV up to 800 kV. according to Siemens' well-proven high standards. 3AP1 FG. High-Voltage Circuit-Breaker. 72,5 kV. The efficient High-Voltage Circuit-Breaker with. Spring-Stored Energy Operating Mechanism the 3AP1 FG 145 kV circuit breaker is made using the same range of components as all Siemens circuit breakers, whether air- or gas-insulated, The purpose of this instruction manual is to assist the user in developing safe and efficient procedures for the installation, maintenance and use of the