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1.3 3 EATON CORPORATION CA010001EN Surge Protection Selection Guide Connection of SPDs SPD between every live connection and earth potential! • To be fitted infront of an RCD • The „3+0“ connection is used in TN-Cand TN-C-Ssystems (if the PEN connection is established within 0.5 m) • 2+0 / 4+0 connections are used in TN-Ssystems, given that no RCD is infront of the SPD Connection Type 1 (CT1) Connection Type 2 (CT2) An additional SPD is installed between neutral and protective earth (galvanic separation is ensured). • Can be installed behind an RCD (various conditions need to be met) • 1+1 connection suited for TN-C-Sand TT networks (single phase) • 3+1 suited for TN-C-Sand TT systems (three phase) • Easy application due to the possibility to be fitted in front or after an RCD (dependent on supply network, test class and type of RCD) Connection of an SPD after an RCD • It is not recommended (or forbidden by local regulations) to install a test class 1 tested SPD after an RCD • The minimum surge current capabilities for an RCD infront of an SPD shall be 3 kA (established by type S/G/F/B RCDs) • Please be aware that even a surge current proof RCD can trip if an SPD is placed in series • Connecting neutral and protective Earth behind an RCD is forbidden. Galvanic separation is needed (1+1/3+1 connection)