Relay Specification
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=142575
Printed Date: May 06, 2024 at 7:32 AM
Topic: Relay Specification
Posted By: jev_ss
Subject: Relay Specification
Date Posted: February 07, 2017 at 10:07 PM
Dear All,
As we know in Form C type relay we have both NC and NO contact switch.
I'm looking for a specific information as follow;
i) why NC contact smaller profile (area and thickness) compare to NO contact?
From the datasheet, NC and NO loads rated very different (inductive and resistive). NC-contact rated for lower loads while NO-contact rated for higher loads.
No standard mentioning on this loads differences in details (as far as i know).
Thank You,
Regards,
Jev
Replies:
Posted By: davep.
Date Posted: February 12, 2017 at 10:01 PM
I read somewhere (probably on here) that the load rating difference is because the N.O. contacts are held together "tighter" by the coil. The N.C. contacts are only held together by spring tension, which is less. Hence the lower current rating for the N.C. Contacts.
Posted By: jev_ss
Date Posted: February 14, 2017 at 11:38 PM
Thanks for the feedback davep.
Regards,
Jev
|