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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.

2 Trip curves of electronic releases Consider a circuit-breaker type T1 160 In 160 and select, using the trimmer for thermal regulation, the current threshold, for example at 144 A; the magnetic trip threshold, fixed at 10·ln, is equal to 1600 A. Note that, according to the conditions under which the overload occurs, that is either with the circuit-breaker at full working temperature or not, the trip of the thermal release varies considerably. 8 s for cold trip. For fault current values higher than 1600 A, the circuit-breaker trips instantaneously through magnetic protection.

4 x I1 t6 4s R PR212/MP I5 ± 10 % t5 ± 20 % U PR212/MP I6 ± 20 % t6 ± 20 % PR212/MP 101 102 x In I3 (6 - 7- 8 - 9 - 10 - 11 - 12 - 13 - OFF) x In The tolerances are according to IEC 60947-4-1. 2 Trip curves 3 General characteristics 3 General characteristics Trip curve electronic releases Emax PR112/P-PR113/P PR113/P release – Function L in compliance with Std. IEC 60255-3 The following three curves refer to the protection function L complying with Std. IEC 60255-3 and integrate the standard one; they are applicable in coordination with fuses and MV circuit-breakers.

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ABB handbook protection and control devices by ABB SACE


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