What is a suitable circuit breaker?
Therefore the suitable circuit breaker is a three-pole E3N circuit breaker with PR1122-123/DC In= A. The connection of the poles is carried out in the factory by ABB. The solution of the table shows the connections between three-pole circuit breaker, load and supply source.
Which circuit breaker is suitable under short-circuit conditions?
According to the column considered, the circuit breaker which would seem suitable under short-circuit conditions is an E2N (N=50kA>Ik). However, according to the table of the rated uninterrupted current (page 39), it is necessary to pass to an E3N since it has Iu= A which is higher than the current absorbed by the loads.
What is the difference between Emax switch disconnectors and circuit breakers?
Table 25. Table 26. Table 27. Emax switch disconnectors maintain the same overall di-mensions and the same accessories as the Emax air circuit breakers. This version differs from the circuit breakers only in the absence of trip units.
What is rated Ultimate short-circuit breaking capacity?
The rated ultimate short-circuit breaking capacity of a circuit breaker is the maximum short-circuit current value which the circuit breaker can break twice (in accordance with the sequence O – t – CO) at the corresponding rated opera-tional voltage.
What is a Emax circuit breaker?
Poles [Nr.] Emax circuit breakers for use in direct current up to VDC can cover installation requirements up to A. These circuit breakers have the same dimensions as the standard circuit breakers, and are available in the fixed and withdrawable versions and can be equipped with PR122-PR123DC electronic trip units.
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