Needs to handle 1.21 gigawatts
On Saturday, August 1, 2015, Chuck McCown <[email protected]> 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 <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Sent:* Friday, July 31, 2015 2:29 PM > *To:* [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Subject:* Re: [AFMUG] 48DC Surge Protector > > I 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 <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Sent:* Friday, July 31, 2015 10:16 AM > *To:* [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Subject:* Re: [AFMUG] 48DC Surge Protector > > I 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 > <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Sent:* Thursday, July 30, 2015 10:09 PM > *To:* [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > *Subject:* Re: [AFMUG] 48DC Surge Protector > > Just a standard screw terminal would work fine. > > On Thursday, July 30, 2015, Chuck McCown < > <javascript:_e(%7B%7D,'cvml','[email protected]');>[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > >> What connectors do you want on it? >> >> *From:* Jason McKemie >> *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> >>>>> 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 >>>>> >>>>> >>>>> >>>>> 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 Bergman >>> 325-439-0533 Cell >>> >> >> > > >
