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What is the contacts resistance value of CAD** range of relays.

This value average impedance (contact resistance) is never indicated in the catalogues. This value is very low in terms of milliohm. 
The contact resistance on a CAD relay, is replaced by the minimum switching capacity, which is 17V, 5 mA. 
However the contact resistance per pole on a new CAD relay is near to 2.5 milliohm at Ith = 10 A. 
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