MCG 4 Module Three Phase and Neutral Type 2+3 Surge Protector with LED Indication (SY2-C40X-LED) | CEF
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Surge Protection Device (SPD) working principle Explained / How to protect from Lightning Strikes - YouTube
32006 - Type 3, Surge Arrester for individual sockets - Surge Devices
10020/4ENCM - Type 1+2+3, 50KA (Level 3/4), 3 phase device with indication, complete in IP65 polycarbonate enclosure, including a 3 pole 63AMP MCB - Surge Devices
DITEK Surge Protection - Industrial & Commercial Power Protection
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Europa's guide to Installing Surge Protection Devices