what safeguards does the MagSafe 2 provide from hissing and sparking power sockets? Does it prevent any damaging voltage from reaching the laptop?

please tell me if there is a fuse built it the MagSafe 2 power adapter.

Apple 45W MagSafe 2 Power Adapter for MacBook Air

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    In general, hissing and sparking power sockets should be avoided at all costs. If the MagSafe power adapter must be plugged into a misbehaving electrical outlet, please wear insulated electrical gloves of the proper voltage rating.

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