What does contact reliability mean in relation to microloads?

Answer

Contact resistance may be a problem when opening and closing microloads, which increases the possibility of low contact reliability. If a high contact resistance value is accidentally generated, it may be recovered by the subsequent operation.
In addition, contact resistance may increase due to generation of contact coating.
Whether or not the contact resistance value is considered a failure depends on whether or not a problem occurs in the circuit.
For this reason, the failure criteria for the contact resistance of relays are specified only in the initial value, and the failure rate is expressed using the P level (reference value) as a guideline for the minimum applied load.
Note that some relay contacts are suitable for opening and closing microloads, while others are not.

Explanation