Timeline for Electronically activated circuit breaker
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 27, 2023 at 7:09 | review | Close votes | |||
| Nov 28, 2023 at 16:21 | |||||
| Nov 27, 2023 at 3:06 | history | became hot network question | |||
| Nov 26, 2023 at 20:48 | comment | added | Hearth | @user1937198 I'm surprised at how cheap that is, considering. | |
| Nov 26, 2023 at 20:21 | comment | added | user1937198 | 12v coil contactors with latching with 12v 200A rating are available off the shelf: digikey.co.uk/en/products/detail/… | |
| Nov 26, 2023 at 20:07 | vote | accept | php_nub_qq | ||
| Nov 26, 2023 at 20:04 | comment | added | bobflux | @Hearth French here: we have AC-DC RDCs which can detect DC fault current to Earth from switching power supplies. However the only difference from a normal RDC is the brains that detect the fault. Contacts are the same, only rated for AC. | |
| Nov 26, 2023 at 19:59 | comment | added | Hearth | @php_nub_qq Though it probably is possible to trip a GFCI in this condition (if you had a GFCI rated for DC, which might not exist); when you suddenly switch in the bypass current path, that's a transition with nonzero frequency components. You might need more than the nominal trip current, but it may work. | |
| Nov 26, 2023 at 19:56 | comment | added | Hearth | @php_nub_qq You didn't mention that it was DC. You'll need a DC-rated breaker; it's much harder to switch DC than AC (the latter will self-extinguish arcs every half-cycle, the former will not). This will increase cost significantly for something in the hundreds of amps. | |
| Nov 26, 2023 at 19:55 | comment | added | bobflux | AC circuit breakers don't work on DC, you need DC circuit breakers | |
| Nov 26, 2023 at 19:54 | answer | added | bobflux | timeline score: 10 | |
| Nov 26, 2023 at 19:53 | comment | added | php_nub_qq | @Hearth do RCDs work with DC? I'm not sure, I think it works on the same principle as AC current clamps, which don't work with DC. | |
| Nov 26, 2023 at 19:49 | comment | added | php_nub_qq | @user1937198 exactly!!! Except I'm not sure if the 12v coil will be strong enough to turn the contactor off. Anyway I got the idea, I can just get an ordinary CB and just attach a mechanism to it to physically trip it, who would have thought... Thank you! | |
| Nov 26, 2023 at 19:36 | comment | added | Hearth | You can electronically actuate any standard (current-controlled) circuit breaker by shunting the output with a thyristor. This is called a crowbar circuit, and is pretty reliable, though the thyristor might not survive many uses unless it's quite a big one. Alternatively, you can use a GFCI (called an RCD in some regions), which you can manually trip by shunting normal operating current through an alternative path (or even just a handful of mA through that alternative path). | |
| Nov 26, 2023 at 19:19 | comment | added | user1937198 | Sounds like you want a latching contactor. | |
| Nov 26, 2023 at 19:06 | history | asked | php_nub_qq | CC BY-SA 4.0 |