Search

Premium Membership

Save 15% on Pro Premium Plan with discount code: UX778 (expires on October 31st). Study specialized LV/MV/HV technical articles and papers.

Electrical contact

The word “contact” not only describes the conductive connection of two mechanically separate electrical conductors, but also the conductive parts (contacts) even if they are not touching. Contacts comprise:

  • Non switching contacts as in connectors being opened only for sen/ice or installation (e.g. screw connections)
  • Sliding contacts
  • Plug contacts to carry but not to switch current
  • Switching contacts as in relays, contactors and switchgear

Relay contacts are physically separate but switchable electric conductors designed to make an electrical connection, carry the load current, break the circuit and electrically isolate the load from the supply. How well the contact system actually performs is dependant on the suitability of the contact material, the contact arrangement and the mechanical
design.

An ideal relay contact would consist of highly conductive metal with chemically clean surfaces (no oxidation) and a large, wear resistant, effective contact area. Open contacts would ideally have infinite dielectric strength for electrical isolation. Unfortunately, actual relay contacts do not have these characteristics. An optimal contact material with high conductivity, resistance to oxidation or chemical reactions and resistance against wear and thermal influences during switching can only be a compromise.

Design and cost clearly limits parameters such as the size of contact area, contact forces, relay sensitivity, and the need for big contact gaps for high dielectric strength.

Title:Contact System
Format:PDF
Size:0.7MB
Pages:52
Download:Right here | Video Courses | Membership | Download Updates

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

Leave a Comment

Tell us what you're thinking... we care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

2  ×  four  =  

Learn to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Apply a 15% discount code EAB77 and enjoy learning!

Subscribe to Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and electrical guides.