We have an ASA 5550 on DC Power. The manufacturers label on this unit recommends a 2.5 amp fuse. We have had a 3 amp installed actually but it has blown out twice since Nov '16.
However two documents I have found on these units seem to imply 10-15 amp requirements.
See page 1-3 of the following doc. Pg 17 in the pdf. (Last bullet point of the first section)
According to …
http://www.cisco.com/c/en/us/td/docs/security/asa/hw/maintenance/guide/asa_hw.pdf
• The adaptive security appliance models equipped with DC-input power supplies must be terminated with the DC input wiring on a DC source capable of supplying at least 15 amps. A 15-amp circuit breaker is required at the 48 VDC facility power source. An easily accessible disconnect device should be incorporated into the facility wiring. Be sure to connect the grounding wire conduit to a solid earth ground. We recommend that you use a closed loop ring to terminate the ground conductor at the ground stud. The DC return connection to this system is to remain isolated from the system frame and chassis.
Pg 1-8 of the document (pg40 of the document) reinforce this spec.
Hmmm, Which is it supposed to be?
Another search for documents concerning the ASA 5500’s brought me to this online guide …
http://www.cisco.com/c/en/us/td/docs/security/asa/hw/maintenance/5500xguide/5500xhw/asa_about.html
So again I’m leaning to the need for a higher rating fuse than what’s currently installed (3A).
Interestingly in the above document if the A/C voltage is:
120 - 15amp
240 - 10amp
All that to ask ...
Does 48V DC power require less amperage or should it still be a 10-15amp fuse?
Thanks,
CG
