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When the surge protection has been triggered, the "active protection" light on the front goes out and an audible signal is given. And what's more: The connected devices continue to operate even when the surge protection is inactive. To regain the protection function, renew the in-built micro-fuse (T6.3 A/250 V) through the included spare fuse. Separate the connected two-pole loads above the in-built illuminated switch from the mains.This text is machine translated.