On 10/22/2014 1:52 PM, Gareth Magennis wrote:
Following on from the Automotive Relay thread;



What are the reasons behind the apparent fact that relays last longest
in this order of coil protection:


Arcing on opening.



1. No protection at all

Fastest opening. Less damage to contacts.

2. Zener diode

If indeed your order is correct,
Slow opening.

3. Resistor (6 x coil resistance)

Slower Opening.

4. Diode

Slowest Opening.
Most damage to contacts.





(No protection being the relay lasts longest, the standard diode being
the worst thing for the relay - forget the circuit protection issues
just now)


From this data - scroll to the bottom for a chart:

http://www.te.com/commerce/DocumentD...=CS&DocLang=EN




Cheers,


Gareth.


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