Timeline for Relationship between inrush current, blowing the fuse and switching power supplies with PFC
Current License: CC BY-SA 4.0
12 events
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| Jul 17 at 9:57 | comment | added | U. Windl | @Dereck I'm not really on "circumventing the required safety device"; instead I'm trying to understand the obvious paradoxon that lower-rated power supplies using PFC seem to trigger a fuse while higher rated power supplies seem not to do so. Or in a nutshell: Does PFC cause a higher inrush current (as the Wikipedia article seems to say), or is it unrelated? I'm sorry if the question wasn't clear enough. | |
| Jul 15 at 20:39 | comment | added | Dereck | The small loads you mention should not be tripping breakers. If they do, they are old and weak, or there may be a GFCI issue. When the brakes on your car get weak and fade. Do you open the door and use your feet to stop the vehicle like Fred Flinstone or get the brakes fixed? This thread needs to be closed. The OP is asking how to circumvent the required safety device. | |
| Jul 15 at 19:47 | comment | added | DrMoishe Pippik | Try using a power strip with RFI suppression (radio frequency interference filter) with that power supply. There are inductors in such a device to reduce sudden inrush current, and capacitors to reduce voltage spikes, both of which might be triggering the circuit breaker. | |
| Jul 15 at 19:05 | comment | added | U. Windl | Interestingly, using the same type of circuit breaker, but connecting the power supply in the cellar does not blow the fuse; my guess is that the longer wires have enough resistance to limit the inrush current. | |
| Jul 15 at 18:49 | comment | added | winny | Same language issue in Swedish. Still, leakage current is probably the issue here but with an A or possibly B type fuse and shorted NTC inrush, you could trip it. I doubt it with a regular C, as your other fuse is. | |
| Jul 15 at 18:38 | history | edited | U. Windl | CC BY-SA 4.0 |
Add details as photos
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| Jul 15 at 16:01 | comment | added | John D | As @TimWilliams is hinting at, if it's an RCD breaker, your problem may be leakage current to ground rather than inrush. In that case, limiting inrush current won't solve the problem. It would be unusual for inrush on such a small supply to blow a 16 A 230 V breaker. On the other hand, breakers do age and can false trip so a new breaker might be necessary. | |
| Jul 15 at 9:00 | comment | added | U. Windl | I'm afraid, the thing is to old to have an A-D characteristic. Be patient, I'll add a photo when I'm back home. In German i't basically the same word ("Sicherung") for both types, but to be more precise one would use "Schmelzsicherung" ("melting fuse") or "Sicherungsautomat" (~"automatic fuse"). So it's the second type. | |
| Jul 15 at 7:24 | comment | added | Tim Williams | Is it a RCD type breaker? | |
| Jul 15 at 6:36 | comment | added | vir | What does "fuse (circuit breaker)" mean? Is it a fuse or a circuit breaker? | |
| Jul 15 at 6:32 | comment | added | winny | What's the fuse characteristic, A, B, C or D? | |
| Jul 15 at 6:27 | history | asked | U. Windl | CC BY-SA 4.0 |