What is the difference between single, twin and crossbar twin contacts in the mechanism for relays?


What is the difference between single contact, twin contacts, and crossbar twin contacts in the contact mechanism for relays?



Contact configurations are classified into three types according to the reliability level: Single contact, Twin contact and Cross-bar Twin contact. Refer to Explanation.



The following table shows typical contacts of our relays.

Typical contacts of relays

  • We have a double (or twin) break contacts type relay in our single contact relays. Double break contacts are suitable for opening and closing large-capacity loads that require breaking capability due to the large gap between the same polarity contacts.
  • Crossbar single contact has the advantage of providing good contact matching even with slight contact misalignment and is used for relatively small current capacities.
  • The crossbar twin contacts have two contact points and have the advantage of a crossbar shape, making it suitable for opening and closing microloads.


Quick tips

Select a signal relay (communication) for microload switching.


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Relays | Digi-Key Electronics

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