Astute commenter of this parish zeitghost has drawn my attention to a rather neat application note on relay contacts, on the website of TE Connectivity. The wisdom includes: “Transformers can present an unusual trap for an unsuspecting relay user. When power is removed from a transformer, its core may contain remanent magnetism. If power is reapplied ...
This story continues at Good relay contact information
Or just read more coverage at Electronics Weekly
from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/good-relay-contact-information-2018-08/
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