Timeline for Can I use both poles of a DPST relay for double intensity? [duplicate]
Current License: CC BY-SA 3.0
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| Mar 25, 2018 at 23:22 | comment | added | D.A.S. | then your question should not have the implied specific case...."Beside, this appliance doesn't start with a high intensity (soft start), and gets stopped before switching off the relay in normal operations." | |
| Mar 25, 2018 at 13:52 | comment | added | youen | @TonyStewart.EEsince'75 Indeed, the added guarantees would change the answer, but my question was primarily for the general case : "I'd like to know if this is an acceptable practice in the general case". It appears it is not acceptable in the general case, for the various reasons given on the duplicate question. Also, soft finish is not really guaranteed, for example if mains power stops suddenly, so will the relay, while the load can be in any state. And finally, the relay would be behind a 40A fuse, so it should be able to withstand that. I'll just be safe and use a 40A relay :) | |
| Mar 24, 2018 at 12:21 | comment | added | D.A.S. | When contact resistance increases arc heat increases temperature, wire insulation may turn black and contact current reduces. Either contacts will weld shut or more likely fail to close with sufficient conductance to carry load. It depends on load inductance and arc quench. | |
| Mar 24, 2018 at 12:09 | comment | added | D.A.S. | But if you guarantee soft start and soft finish, so no arc , I see no problem. So not a duoplicate question because of your gauranteed specs. | |
| Mar 24, 2018 at 10:23 | history | closed |
Spehro 'speff' Pefhany Harry Svensson CommunityBot |
Duplicate of Is it good practice to parallel relay contacts for increased current capacity? | |
| Mar 24, 2018 at 10:23 | comment | added | youen | @SpehroPefhany you're right, it's a duplicate. I did not find it, I guess the missing keyword was "parallel". Thanks. | |
| Mar 24, 2018 at 10:13 | review | First posts | |||
| Mar 24, 2018 at 10:28 | |||||
| Mar 24, 2018 at 10:09 | history | asked | youen | CC BY-SA 3.0 |