One of our customers gave us a sample product for inspection. It has a relay output for 220V loads (e.g. fan, bulb, etc.)
Just out of curiosity, what is the meaning of the \$\mu\$ symbol here?
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It appears to indicate “micro disconnection” with a physical contact gap that is not of a certain minimum size. From this Shrack/Tyco document:
Micro disconnection Adequate contact separation in at least one contact so as to provide functional security. Note: there is a requirement for the dielectric strength of the contact gap, but no dimensional requirements.
It may be described in IEC/EN 61058-1, but I do not have a copy to confirm.