Re: 48V hardware [RE-wrenches]
Allan at Positive Energy wrote:
2. ... I am
using float switches to control 48V mercury displacement relays for
these DC pumps. Can anyone suggest a source of SPST, SPDT, and DPDT
bat (or any style) switches suitable for 48VDC nominal, low current
loads? These would be for a custom relay control enclosure with
override and remote low tank alarm signal
circuits.
My frequent observation on DC ratings for mechanical switch
contacts is that it's amp rating at 125VAC equals its amp rating at
28VDC. This is consistent in the specifications of a great many
switches, relays, etc. If there are higher voltage ratings, then
if voltage is doubled, amps is half.
When 48V is not specifically listed (nor any higher DC voltage),
I feel safe following that rule if I apply a good safety margin, as
long as the switch has a rapid snap action like a toggle switch does.
For the low current control and alarm loads you describe, I would
feel forevever safe using a switch with a 15A rating at 28VDC. If you
need to get official approval, ask the manufacturer of the switch you
propose to use.
Windy
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