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Besides, current limitation may also be used to obtain back-up protection between two circuit-breakers in series. In addition to the advantages in terms of design, the use of current-limiting circuit-breakers allows, for the cases detailed by Standard IEC 60439-1, the avoidance of short-circuit withstand verifications for switchboards. 1 of the Standard “Circuits of ASSEMBLIES which are exempted from the verification of the short-circuit withstand strength” states that: 1 1 10 102 103 Irms [kA] “A verification of the short-circuit withstand strength is not required in the following cases.

Besides, current limitation may also be used to obtain back-up protection between two circuit-breakers in series. In addition to the advantages in terms of design, the use of current-limiting circuit-breakers allows, for the cases detailed by Standard IEC 60439-1, the avoidance of short-circuit withstand verifications for switchboards. 1 of the Standard “Circuits of ASSEMBLIES which are exempted from the verification of the short-circuit withstand strength” states that: 1 1 10 102 103 Irms [kA] “A verification of the short-circuit withstand strength is not required in the following cases.

2 Trip curves 3 General characteristics 3 General characteristics Trip curve electronic releases T4 250/320 T5 400/630 PR221DS Trip curve electronic releases 104 0,4-0,44-0,48-0,52-0,56-0,6-0,64-0,68-0,72-0,76-0,8-0,84-0,88-0,92-0,96-1 L-S Functions 0,4 103 1 1,5 2 2,5 3 3,5 4,5 5,5 6,5 7 7,5 8 8,5 9 10 1 T4 250/320 T5 400/630 PR222DS/P and PR222DS/PD 104 L-S-I Functions (I2t const = ON) 103 0,4-0,42-0,44-0,46-0,48-0,5-0,52-0,54-0,56-0,58-0,6-0,62-0,64-0,66-0,680,7-0,72-0,74-0,76-0,78-0,8-0,82-0,84-0,86-0,88-0,9-0,92-0,94-0,96-0,98-1 0,4 1,2 1,8 2,4 1 3 3,6 4,2 5,8 6,4 7 7,6 8,2 8,8 9,4 10 5,5 2,5 3 t [s] t [s] 4 6,5 4,5 0,6 102 102 7 5 7,5 8 9 9,5 1,5 10,5 10 10 12 102 1 1 10-1 T5 1SDC210004F0004 T4 10-2 10-3 10-1 1 10 x In 1 10 Iu [kA] T4 T5 1SDC210001F0004 10-1 102 I2t ON 10-2 10-3 10-1 1 10 x In 10 Iu [kA] Note: The dotted curve of function L corresponds to the maximum delay (t 1) which can be set at 6xl1, in the case where 320 A CTs are used for T4 and 630 A for T5.

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ABB handbook protection and control devices by ABB SACE


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