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| How to protect circuit? Turn one line on another line off with two pole DPDT Rel |
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| nardev:
I have a situation where i'm supposed to turn of one line and turn on another line at the same time. Actually, it would be great if there is slight delay between those switching to let the device be protective and to do it bit more safe. (Avoid sparks etc) If i use two relays, i would not have that problem, i would simply make 0.5s delay between on/off of the relays and everything ok. But for the sake of using only one two pole DPDT relay, i need this. The power lines that are used for switching could be 12VAC or 12VDC, max 1A current. Any idea? Any suggestion? How to protect the circuit? Etc? |
| Psi:
You will be fine using a relay. A relay is already a mechanical switch with delay. When the movable contact breaks one connection it has to physically move before it makes contact with the other side. During this time neither side is connected to the movable contact. 99.99% of all relays and switches are of the "Break-Before-Make" type. (I don't think i've ever seen a "Make-Before-Break" type relay, although i'm sure they exist. And Make-Before-Break switches do exist but are very specialized) If you want to add extra delay use a bigger relay with bigger contacts, they will take longer to move between states. Or you could drive it with a lower voltage. |
| nardev:
I think this picture is bit more descriptive ? This is what i'm wondering about? |
| wraper:
--- Quote from: nardev on September 11, 2019, 12:41:37 pm ---I think this picture is bit more descriptive ? This is what i'm wondering about? --- End quote --- Contact group on bottom does nothing. It always stays open. |
| nardev:
--- Quote from: wraper on September 11, 2019, 12:47:14 pm --- --- Quote from: nardev on September 11, 2019, 12:41:37 pm ---I think this picture is bit more descriptive ? This is what i'm wondering about? --- End quote --- Contact group on bottom does nothing. It always stays open. --- End quote --- Yes, that line is common for everything there. I have specific reason why i would do this. Nothing out of the text book IMHO that's why i'm asking. And, this is only for DC. For AC i think i have another option. |
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