The Relpol RSP-E12.5-40 is surge protection device for AC installations, rated voltage 230 V AC. RSP-12.5-40 is class I & class II (or T1+T2 ) SPD designed for low-voltage power system lightning current & surge protection, especially for location of high risk exposure or LPZ 0-2 building entrances ( IEC 62305-4), number of poles 4. Max. discharge current 80 kA, lightning current capacity up to 12.5 kA 10/350 μs.
The protection capability of RSP-E12.5-40 is defined by the surge-current, operating-voltage, pole and class/type values stated above. Those exact ratings should be matched to the protected AC installation and its required lightning/surge protection level.