The Electroalfa switchgear for primary distribution, of the S 12xx range, for a maximum voltage of 12KV c.a., have been tested for values of the continuous rated current of up to 5,000A and values of the rated peak withstand current of 50 KA/ 1s. This type of gear withstands the action of the internal electric arc, with a classification index of up to IAC AFLR 50KA, 1s. The switchgear from the range of S 24xx, for a voltage of 24 KV c.a. have been tested for values of the continuous rated current of up to 2.500A and values of the rated peak withstand current of 25 KA/ 1s. This type of gear withstands the action of the internal electric arc, with a classification index of up to IAC AFLR 25KA/ 1s.
The switchgear ensures the continuity of service, according to the standard classification LSC2B. From the point of view of the separation of compartments, the classification of these switchgears is PM. The switchgear for primary distribution is made up of a metallic cabinet made up of sheet panels assembled with special rivets, fittings or electric point welding, which includes the equipment of low voltage required for the exploitation specifications, including the withdrawable circuit-breaker and the measure, command, protection and signaling low voltage equipment.
The withdrawable circuit-breaker has three functional positions: in operation, test and withdrawn. It can go from one to another position smoothly and shock-free, on the circuit path.