A circuit overload is what investigators say caused a deadly fire Wednesday in York.

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Transistor VT2 provides short-circuit protection to the load, with red LED D4 indicting an overload. (D2 blows out simultaneously with an overload.) Short-circuit current does not exceed 38 mA.

An overloaded electrical circuit on the first floor of a three-story York City duplex was the cause of a fire Wednesday that killed three people.