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:
- No protection at all
- Zener diode
- Resistor (6 x coil resistance)
- Diode
(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:
Cheers,
Gareth.