A fuse on the GigE-POE-APC would be awesome!I have an assortment of 1A, 3A and 5A 5x20mm fuses, so I wouldn't need one provided. I guess you could do a shorting link for anyone that already has external over-current in place. I'm just starting a new project using Forrest's SiteMonitor 5ch PDU modules which does its own solid-state protection, so there's one example where an on-board fuse wouldn't be needed.
On 8/1/2015 11:10 AM, Chuck McCown wrote:
I could probably fit a fuse on the GigE-POE-APC. Yes, thinking of attempting to protect both forward and return.Not sure if I should actually provide a fuse or just a jumper that shorts out the fuse holder.If they ship with a fuse, what size? *From:* George Skorup <mailto:[email protected]> *Sent:* Friday, July 31, 2015 2:29 PM *To:* [email protected] <mailto:[email protected]> *Subject:* Re: [AFMUG] 48DC Surge ProtectorI vote for the plugable type that you use on the POE cards. Easier to swap a blown card. Are you proposing to protect both the forward and return? So maybe a smaller 4-position block?I would also say a single LED that is not lit when the fuse is blown would be pretty simple. However, there is a benefit in having a second LED that shows when current is flowing, like how the Trango licensed POE boxes work. I wouldn't really care if it didn't have that though.I was also recently looking at a GIGE-POE-APC card and wondering if you could fit a 5x20mm fuse on it. It's pretty packed, so probably not.On 7/31/2015 11:55 AM, Chuck McCown wrote:LEDs showing a failure of the surge devices are hard to do. They can fail high or low impedance. The cost of the test circuitry would exceed the cost of the rest of the device. I could put on a voltage and load current set of LEDs like the 444 surge suppressors, but how much load would we want to be able to pass?I presume perhaps 10 amps max would be OK?I can’t understand why anyone would want to create a polarized suppressor. It only saves a few pennies and would force you to build, stock, sell, ship two different versions. I can do screw terminals or the phoenix plug types like I use on the GigE-POE-APC units. If you want to use a fork terminal I think you would have to cut one off. But it is nice to be able to terminate the wires and then plug them all in. Also makes it quick and easy for troubleshooting. Quick to plug in and unplug.*From:* Adam Moffett <mailto:[email protected]> *Sent:* Friday, July 31, 2015 10:16 AM *To:* [email protected] <mailto:[email protected]> *Subject:* Re: [AFMUG] 48DC Surge ProtectorI don't think I've seen one that was anything other than a screw terminal. Usually it's the type with a square washer thing under the screw head that clamps down when you tighten the screw. Perfect for fork terminals, or solid wire.I was curious about something. Connectronics sells a separate "+/-48V" and "-48V" model (82-3750 and 82-8694 respectively). We've only ever used the +/- model, which does not ground either power terminal. It does have a + and - marked on the terminals and a green LED that turns on when there's power present (good feature btw).I don't understand why there's a -48 version at all. If your equipment has a positive ground, and your supply has a positive ground, why would you want another positive ground in the middle?Separately: Thinking about the green LED made me wonder how hard it would be to have a red LED come on when the power supply side is connected, but there's an open circuit on the load side, such as the load being broken/disconnected or the gas tube being popped.So, just two screw terminals that are surge protected to the ground bus. That is doable. Put a gas discharge tube on it along with some faster semiconductor devices. Some fancy DC power surge protectors have some choke coils and an in and an out.*From:* Jason McKemie <mailto:[email protected]> *Sent:* Thursday, July 30, 2015 10:09 PM *To:* [email protected] <mailto:[email protected]> *Subject:* Re: [AFMUG] 48DC Surge Protector Just a standard screw terminal would work fine. On Thursday, July 30, 2015, Chuck McCown <[email protected]> wrote: What connectors do you want on it? *From:* Jason McKemie <javascript:_e(%7B%7D,'cvml','[email protected]');> *Sent:* Thursday, July 30, 2015 1:50 PM *To:* javascript:_e(%7B%7D,'cvml','[email protected]'); *Subject:* Re: [AFMUG] 48DC Surge Protector I didn't think he was making anything yet. One that fit in the APC rack mount unit would be perfect. On Thu, Jul 30, 2015 at 2:23 PM, Lewis Bergman <javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: Chuck has one. On Thu, Jul 30, 2015 at 11:45 AM, Jason McKemie <javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: Where did you buy these? On Thu, Jul 30, 2015 at 10:29 AM, Paul McCall <javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: When we investigated this to protect our 48v syncInjectors…. DJ with Shelby Broadband turned me onto these… we have only had them in place for a few weeks so cant really comment much. http://www.citel.fr/en/produit/citel-AC-power-SPDs/citel-Type-2-DC-surge-protector/surge-protector-DS230DC-series/ds230-48dc.html *From:*Af [mailto:javascript:_e(%7B%7D,'cvml','[email protected]');] *On Behalf Of *Sean Heskett *Sent:* Thursday, July 30, 2015 11:15 AM *To:* javascript:_e(%7B%7D,'cvml','[email protected]'); *Subject:* Re: [AFMUG] 48DC Surge Protector For Ethernet or for just DC power? For Ethernet we use the gigE-APC-POE from wbmfg.com <http://wbmfg.com> For DC power we use 1,3 or 10 amp "car fuses" in a fuse block. On Thursday, July 30, 2015, Adam Moffett <javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: Does anybody have a SS for DC power lines that they like? Transtector is a little pricey at $200/each so I was looking for alternatives.-- Lewis Bergman325-439-0533 <tel:325-439-0533> Cell
