| ??? 03/24/07 09:43 Read: times |
#135751 - Assymetry Responding to: ???'s previous message |
I too came to the same conclusion many years ago regarding triacs - the 'proper' fuses cost more than the device they are protecting. With light dimmers, when a filament bulb blows, it creates an arc that draws some current. This normally fries the triac. As for what happens with a solenoid - as it normally doesn't go open circuit I can only assume you're getting voltages spikes either from the mains or from the solenoid when switching. The other is assymetry from a failing opto or an opto not driven with enough led current.
Snubbers have the positive side effect of limiting voltage spikes, so more snubbing can have a positive effect. |
| Topic | Author | Date |
| Protecting a Triac | 01/01/70 00:00 | |
| Bigger triac | 01/01/70 00:00 | |
| Snubber, mains filter, varistor? | 01/01/70 00:00 | |
| Assymetry | 01/01/70 00:00 | |
| Snubber ? | 01/01/70 00:00 | |
| RE: Snubber | 01/01/70 00:00 | |
| Protecting a triac | 01/01/70 00:00 | |
| switch at zero crossing? | 01/01/70 00:00 | |
| Zero crossing | 01/01/70 00:00 | |
| Is it back EMF or short circuit | 01/01/70 00:00 | |
| Polyswitches | 01/01/70 00:00 | |
| Thermal properties aside | 01/01/70 00:00 | |
| Why bother ? | 01/01/70 00:00 | |
| I vote for overrating too | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
Not "over" just proper | 01/01/70 00:00 |