single-phase fuse in the off position, residual current device in the on position and surge arrester for protection against electr

arrester automatic automation board box breaker breakers built button circuit circuits closeup conduit connect connection control current cycle device devices discharge distribution electric electrical electrician electricity electronic energy fuse fusebox industry lightning panel plug position power protect protection rcd residual safety singlephase station storm strikes supertension supply surge switch switchboard switches threephase voltage wall wire wiring