Normally refers to a poly phase motor starter that monitors current draw in all three legs and interrupts all legs. the most popular use "heater-melting alloy" technique, magnetic current monitoring is also popular but IMHO thermal alloy offers superior protection in high starting load applications.
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imagine a line that is drawn across a shape. the area above that line is equal to the area below that line.
a figure that has a line drawn horizontally across the figure
17000000000000000 miles long
when it is a parallel line across the x and y axis
a horizontal line is a line that goes strait across like the one underneath there are in the subject :math and sometimes science