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I read in the datasheet of this PCB relay, that the relay has high switching reliability due to crown contacts.
What mean crown contacts ?

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It's a characteristic of the forcibly guided relay, see Relay terminology

Crown Contacts: Improved contact form to enforce high contact stress on at least two spots on the contact to penetrate any built-up contamination; to maintain low contact resistance throughout the life of a relay; and to increase the value of switchable output voltage. Supports low current to high power applications.

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