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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. 2 Trip curves of electronic releases PR221 Introduction The following figures show the curves of the single protection functions available in the electronic releases.

12 12 I2t ON 10 10 102 102 1 1 T4 T5 400 I2t OFF 10-1 10-1 T5 630 T7 S,H,L 10-2 10-2 T6 630 T7 V T6 800 T6 1000 10-3 10-3 10-1 1 10 1 x In 2 10 I [kA] 10-1 1 10 10 x In 102 I [kA] Note: For all the CT sizes the maximum delay t1 is equal to 18s, except for 320 A CT (T4) and 630 A (T5) where t1=12s. For T4 In = 320 A, T5 In = 630 A and T6 In = 630 A ⇒ I3 max = 10 x In. Only the electronic settings are available. 9-1 In disabled at 8 In t=k 10-1 10-1 T7 S,H,L t=k T7 V 10-2 10-2 10-3 10-3 10-1 10 1 10 x In 102 I [kA] 10-1 1 10 10 2 I [kA] For T7 In = 1250 A, 1600 A ⇒ I3 max = 12 x In.

00 In prevention at 8 In 1SDC210003F0004 10-2 10-3 10-1 1 10 102 x In Note: For PR223DS and PR223EF the electronic settings only are available. 84 I2t OFF 10-1 10-1 ABB SACE - Protection and control devices 10-2 10-3 10-1 1 10 102 I [kA] Note: The dotted curve for functional corresponds to the maximum delay (t1) wich can be set at 6 x I1, in the case where 320A CTS are used for T4 and 630A for T5. For all the CT sizes the maximum delay t1 is equal to 18s, except for 320 A CT (T4) and 630 A (T5) where t1=12s.

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