The device you're looking for is called a blown fuse, and sometimes called a
tripped breaker.  Once the fuse blows, or the breaker opens, there is no power
on the line at all and that makes everything run cooler.

Motors run cooler - no current, no heat!
Light bulb and ballasts run cooler - no current, no heat!
Transformers, panels, switchgear, breakers, starters, controls run cooler -
again, no current no heat!
SCRs, diodes, switching transistors and microprocessors all run cooler - the
magical no current no heat applies here too!
Switching power supplies are more stable - zero current AND volts means NO
ripple!
Process and production controls are more accurate and reliable - absolutely,
they're off and you'll always know exactly what's going on!
Air conditioning and refrigeration is more effective and reliable - again, no
current, no heat, no need for AC
In-House and outside maintenance and repair labor costs decrease - if 
it is off
you won't know that it is broken, therefore you won't fix it, which saves you
tons of money!
Equipment repair and maintenance parts cost decrease - same as previous one
Light bulb and ballast replacement costs decrease - they'll never go bad!
Costs to production or process downtime are decreased - think of all the money
you save in that electrical bill!
Computer data is more secure and safe - absolutely!  No current, no 
mips, no way
for viruses or hacker to screw up you data
Computer operation is more reliable and safe - dito!
Communications systems are more reliable - yes, it is called sound and it is
produced by your vocal cords!  It requires not electricity!
Lights flicker less - they won't flicker at all ever again as long as the fuse
is blown!


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