Hi reflectees !
I guess the relay issue is of common interest here.
Even if a surface seems to be hard and rigid, the common contact surface can be
enhanced by extra pressure, with an accurate Ohm-meter You can measure that. At
a relay contact regularly there is dissipated heat, pressure leads to a more
common heat conducting body of metal and minimzes thermal differences and
surface bending by heating. Everybody who contacted wires with sufficient
current with bare fingers knows the effect of pressure at metal to metal
contacts. The relay manufacturer knows why he says 26.5 Volts, he knows the
magnetic force necessary to make a contact pressure to yield the current
allowance and specifications.
At the cost of vacuum relays it may not be a good idea to save a penny per year
electricity for the coil and loose a 100 dollar+ relay.
73 de wolf df2py
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