PDU for high amp 48Vdc

Andy Brezinsky andy at mbrez.com
Thu Jan 29 02:49:27 UTC 2015

We use ServerTech for -48Vdc switching, 

Not quite remote-hands cheap, but worth every penny in a pinch.

On 01/28/2015 08:38 PM, Robert Drake wrote:
> For larger DC devices with ~50amps per side, does anyone have a 
> software accessible way to turn off power?
> I've looked into PDU's but the ones I find have a max of 10amps.
> I've considered building something with solenoids or a rotary actuator 
> that would turn the switches on or off, but that's a complete one-off 
> and would need to be done for each device we manage (not to mention it 
> involves janky wiring all over the place I've got to explain to the colo)
> My use case is pretty infrequent so it needs to be remote-hands 
> cheap.. it's for emergencies when you need to completely power cycle a 
> redundantly powered DC device.  The last time I needed this it was 
> because a router was stuck in a boot loop due to a bad IOS upgrade and 
> wouldn't break to rommon since it had been >60 seconds.  It came up 
> again tonight because we wanted to disable one power supply to 
> troubleshoot something.
> FWIW, I believe I've seen newer Cisco gear with high-end power 
> supplies that have a console or ethernet port which would possibly let 
> you shut them down remotely.  That solves the problem nicely if you're 
> dealing with only one bit of hardware, but I'd like a general solution 
> that worked with any vendor.  Possibly a fuse panel with solenoids 
> that could add/remove fuses when needed.. or would that be considered 
> dangerous in code-ways or in telco fire regulation ways?

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