I'm not sure goosing the pull-in voltage is always a good idea. It may
shorten the initial closing time a bit, but (depending on the relay)
it can aggravate contact bounce, doing more harm than good. It also
stresses the relay.
Done properly, it doesn't hurt a thing. The proper way is to use current
limiting.
It is safe to run 50 volt supplies on most 12 volt relays, but there is a
point of diminishing returns on speed. The high initial voltage ramps up the
magnetic field faster, but it does not cause excessive heat or current. This
is because the relay starts at near zero mA from inductance.
None of this matters, though. Using a relay on make for protection is a bad
idea. The de-active state should be used for protection, and the active
energized state used to allow RX.
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