Digital Inputs
Digital Inputs
(OP)
Our customer has asked us to provide a potential free contacts rated 8A-220vac/24dc for digital inputs into their system. however our instrument suppliers are saying that this rating is really high and that they have never came across it before, they have only supplied pressure switches rated 5A and the closest they can find for our need is 15A. Has anyone got an idea as to why the switch contacts need to be rated so high?
I have found a relay that i think would meet the specs weidmuller DRM270024LT. Would we need to run the digital inputs through this relay to input into the clients system?
Thanks
I have found a relay that i think would meet the specs weidmuller DRM270024LT. Would we need to run the digital inputs through this relay to input into the clients system?
Thanks





RE: Digital Inputs
RE: Digital Inputs
Why would he need that? Are you sure he knows what he's talking about?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Digital Inputs
If these contacts are driving PLC or DCS I/O then the 8A requirement seems somewhat overkill and may be counterproductive. A gold-flashed signal contact will usually perform better in the long term than a Ag-Cd power contact when switching very low currents at low voltage.
RE: Digital Inputs
A lot of these old specifications have been recycled for the past 40 years or so.