Back-Feed Protection (Optional Only For 30 - 40 Kva); Figure 24: Fuse F12 Back-Feed Protection 30 - 40 Kva - AEG Fluxpower HE Series Installation And Start-Up Manual

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4.8 BACK-FEED PROTECTION
(OPTIONAL ONLY FOR 30 – 40 KVA)
With the back-feed protection option (only for 30 – 40 kVA), it is mounted
on the terminal board. The fuse F12 that protects the power supply cable
for contactor back-feed protection / relay RL1 PB244 back-panel board.
Figure 24: Fuse F12 back-feed protection 30 – 40 kVA