MANDRIQQ When the size of contacting asperities becomes larger than the mean free path of electrons, Holm-type contacts become the dominant transport mechanism, resulting in a relatively low contact resistance. The National Association of Relay Manufacturers and its successor, the Relay and Switch Industry Association define 23 distinct forms of electrical contact found in relays and switches. Where Form C guarantees that, briefly, both connections are open, Form D guarantees that, briefly, all three terminals will be connected. Its operation is logically inverted from Form A. An alternate notation for Form B is SPST-NC. Holm, Ragnar (1999). Electric Contacts: Theory and Applications (4th ed.).|Introducing Togel Cc