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1.2 2 EATON CORPORATION CA010001EN Surge Protection Selection Guide Type Overview SP B T12 - 280 - 3+NPE / BB Product Group SP Surge Protection Test Class Required, if an external lightning protection system is established Protection for sensitive device in a fixed installation Minimum requirement if no external lightning protection system is established T1 T2 T3 Connection Types CT1 1+0 / 2+0 / 3+0 / 4+0 SPD between line and PE CT2 1+1 (NPE) / 3+1 (NPE) SPD between line and neutral connection Additional SPD between neutral and PE Product Family Z Combined testclass SPD for 40 mm busbar B Combined test class SPD for applications with an established lightning protection system E Class 2 tested SPD to fulfill minimum requirements PV Test class 2 and combined test class SPD for PV applications R Combined testclass SPD for critical infrastructure C Class 2 tested (some types are additional class 3 tested) D Class 3 tested SPD to protect sensitive devices in a fixed installation T1 T1 T1 T1 T2 T2 T2 T2 T2 T3 T3 Continuous operational voltage (Uc) The SPD is nonconductive up to this voltage level! This value is set by national regulations an is dependent on the connected supply system. Product Suffix AX Auxiliary contact is fitted to the SPD H Higher impulse discharge rating (Iimp) BB SPD is prefitted with a busbar T2 T3 OS Special SPZT-Stypes with fused outgoing power supply