Technical details System pro M compact®

Systempro M compact ®Technical detailsOVR Surge Protective DevicesSPDsInstallation rules for SPDs: choice of associated breaking devices (fuse/circuit-breaker)Choice of disconnectorSurge arresters must be associated with upstream short-circuit protection and residual current protection against indirect contact (usually alreadypresent in the installation).FunctionApplication• Residual current circuit-breaker compulsory for TT systems• Residual current circuit-breaker possible for TN-S, IT and TN-C-S systems• Residual current circuit-breaker forbidden for TN-C systemsProtection against If a residual current circuit-breaker is used, it is preferable to use a type S.indirect contactOtherwise there is a risk of nuisance tripping.This does not affect the effectiveness of the surge arrester,but may cause the circuit to be opened.orProtection againstfault currentsThe breaking device associated with the surge arrester canbe either a circuit breaker or a fuse.Its rating should take into consideration the surge arrester’scharacteristics and the short-circuit current of the installation.Thermal protectionThermal protection is integrated into the surge arrester.Maximum circuit-breaker or fuseprotection rating depending onI maxand I impof the surge arrester.Type 1 surge arresters Circuit-breaker (curve C) Fuse (gG)25 kA (10/350)• I cc= 300 A to 1 kA - 125 A• I cc= 1 kA to 7 kA - 125 A• I cc= 7 kA and above - 125 AType 2 surge arresters Circuit-breaker (curve C) Fuse (gG)70 kA (8/20)• I cc= 300 A to 1 kA 30 A (1) 20 A• I cc= 1 kA to 7 kA 32 A to 40 A (2) 40 A• I cc= 7 kA and above 32 A to 63 A (3) 63 A40 kA (8/20)• I cc= 300 A to 1 kA 25 A (1) 16 A• I cc= 1 kA to 7 kA 25 A (2) 25 A• I cc= 7 kA and above 25 A to 50 A (3) 50 A15 kA (8/20)• I cc= 300 A to 1 kA 10 A to 25 A (1) 16 A• I cc= 1 kA to 7 kA 10 A to 32 A (2) 16 A• I cc= 7 kA and above 10 A to 40 A (3) 25 A to 40 A(1) Series S 230 and S 240. (2) Series S 240 and S 250. (3) Series S 270 to S 290.11ABB11/85