Mfg.Part: BK350 | CDW Part: 290573 | UNSPSC: 26111701
Availability: In Stock
Was $130.00
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Product Overview

The effects of power problems include keyboard lockup, complete data loss, hardware degradation, damaged motherboards, and more, making downtime inevitable. An APC Back-UPS CS instantly switches your computer to emergency battery backup power and allows you to work through brief power outages or to shut down your system in the event of an extended outage. High-performance surge suppression protects your computer from electrical noise and damaging power surges - even lightning.


Additional Surge Protected Outlets

Audible Alarms

Cord Management

Intelligent Battery Management

Internet FAX - modem - DSL protection

Overload Indicator

Replace Batt Indicator

Site wiring fault indicator


Unattended Shutdown

User Replaceable batteries

USB compatible
APC Back-UPS CS 350VA UPS is rated4.62 out of5 by26.
Rated 5 out of 5 by from Most Reliable Back-Up PowerThese are built like tanks and never ever fail. Love them. Best Back-Up power ever.
Date published: 2017-06-12T00:00:00-04:00
Rated 5 out of 5 by from Recommend to everyoneSold these to many of my costumers and haven't had any disappointments yet.
Date published: 2017-04-13T00:00:00-04:00
Rated 5 out of 5 by from Excellent ProductWe installed 5 of these about a month ago. We had a power outage on 10 June 2010 and they worked exactly like they were supposed to. Very smooth transfer to the APC, just as smooth when power came back on in 10 minutes. We are very happy to have installed these before our usual round of power outages, they usually occur once every week or so. Keep up the good work.
Date published: 2010-06-14T00:00:00-04:00
Rated 5 out of 5 by from Excellent ProductExcellent product. If you use 1 Back UPS this year, it needs to be this one!
Date published: 2016-12-15T00:00:00-05:00
Rated 5 out of 5 by from Works as PromissedI bought this for my daughters desktop because her last one was damaged when the power went off several times which happens in our area. This has helped save the computer many times.
Date published: 2013-11-23T00:00:00-05:00
Rated 5 out of 5 by from Great UPSGreat product - APC Has done it again with this fantastic, inexpensive UPS!
Date published: 2017-04-11T00:00:00-04:00
Rated 5 out of 5 by from Great Product but have some concernsI have purchased BK350s in the past and have had great success with them in helping me to protect my equipment. However, I am presently having difficulty installing the software for auto shut down. I understood that the new software would work with Macs.
Date published: 2011-06-15T00:00:00-04:00
Rated 5 out of 5 by from Best Bang for the BuckCompact and solid. More than ample protection for our AV system.
Date published: 2017-05-10T00:00:00-04:00
Rated 5 out of 5 by from ups 350this product was perfect for a small office ups. it has worked well in our environment and run without issue
Date published: 2017-06-21T00:00:00-04:00
Rated 5 out of 5 by from Works well.Dependable. Easy to install. Very pleased with quality.
Date published: 2018-02-21T00:00:00-05:00
Rated 5 out of 5 by from Power SupplyI was disappointed with the power supply, but I may have purchased models that were insufficient for my computer system. Potentials buys would be wise in consulting APC before purchase to make sure the UPS is adequate.
Date published: 2009-11-03T00:00:00-05:00
Rated 5 out of 5 by from Recent purchaseHaven't had this very long, but does the job. A little on the heavy side, but it's under a desk so it shouldn't be moved around very much. Works as advertised.
Date published: 2011-11-24T00:00:00-05:00
Rated 5 out of 5 by from software sucksold software documentation doesn't match the software, which is odd since the software itself hasn't been updated in 5 years so how old does that make the documentation? I replaced the battery in my UPS but the software (v3.0.2) reflects I have less than 1 minute of battery. The documentation says to reset the battery replacement date, but where? It does not say, and looking at the most recent (again, 5 years old) software interface provides no indication where I can do that. Nor is there any place to trigger a battery self-test, which is also mentioned in the documentation. So, if I can't get the unit to recognize a new battery I may just change to a different vendor.In the apc forums someone said they used a really really old version of powerchute (v1.x) and in that version they were able to reset the replacement date. This shouldn't be necessary. Plus, this site no longer provides those other versions for download so how am I supposed to try that method if I don't already have an old version archived on my computer from a previous download?
Date published: 2017-07-22T00:00:00-04:00
Rated 5 out of 5 by from Adequate but expensiveI assume this product will work well when needed. APC products generally do. However, I have 1 gripe and 1 kudo.Good: a paper with the model & serial numbers is taped to the side of the unit. This is handy for registration. Avoids need to remove plugs to read sticker.Bad: despite bragging that they have room for 2 transformer plugs, they do not. At least not if one is a 2 blade style. Mine covers other plugs.
Date published: 2010-12-26T00:00:00-05:00
Rated 5 out of 5 by from ReliableWe always buy this brand because they last so long. We get super fast shipping from CDW and always in stock. Great price too.
Date published: 2018-05-09T00:00:00-04:00
Rated 5 out of 5 by from nullOn March 5, 2011 a huge thunderstorm with hundreds of lightning strikes caused a main power line to fall in the alley. It sent 7200 volts into my home. Blowing out the master breaker and the complete breaker panel. I was working at the computer when I heard the blast in my house and all the lights went out except my computer. The BK350 kept everything running until I shut it off a few seconds later. It protected the Computer, Scanner, Printer, Work Light and a Radio. Two days later when our system was restored I turned on the computer. It would come on, but not stay on. I hit the reset button on BK350 and it exploded internally. I removed it and put a backup in place and the computer ran fine. It saved my computer and accessories.
Date published: 2011-03-31T00:00:00-04:00
Rated 5 out of 5 by from Work great!When your UPS desktop needs aren't very demanding these little beauties work great! Just as dependable as the larger models. Definitely check these out!
Date published: 2017-05-07T00:00:00-04:00
Rated 5 out of 5 by from CS 350 Back Up Power SupplyLike this product very much. It is sufficient for my needs.
Date published: 2010-02-08T00:00:00-05:00
Rated 5 out of 5 by from A good purchaseI hav had several units. They all seem to be great. Weakest part of any of the units is battery life.
Date published: 2011-12-08T00:00:00-05:00
Rated 5 out of 5 by from CS 350I've owned mine for 4 years without issue until now. The Battery cracked, but didn't leak into the unit. Even with a cracked battery it still worked, only found the problem while cleaning the dust out. The replacement only costs $39.00 and will buy it now to keep using the unit.
Date published: 2009-04-12T00:00:00-04:00
Rated 5 out of 5 by from Great UnitNeeded to replace my APC ES350. So I decided to go with this model since I have the larger 1500 versions that have been running for years without a problem. It has been a few months now using this for my modem/router and it has performed amazing. What I replaced was actually the second ES350, which honestly are junk, they typically die within a year and replacing the battery only extends this another 3-6 months before the rest dies, usually killing a good battery inside. I went through 2 ES350 models within 30 months which is abysmal when my XS1500 models have been running for years flawlessly (only need to replace the batteries every 3-4 years).
Date published: 2017-06-19T00:00:00-04:00
Rated 5 out of 5 by from Best YetBought this unit to replace one we had for over 12 years. This is more compact and looks so much better. It was easy as pie to hook up and has been the best. Looking forward to another 12+ years with my APC!
Date published: 2014-01-22T00:00:00-05:00
Rated 5 out of 5 by from nullThis product was delivered in a timely manner and was very easy to install.
Date published: 2010-06-28T00:00:00-04:00
Rated 5 out of 5 by from Not disappointedMy experience with this product was wonderful. I would recommend it to anyone who's looking for a similar product like this.
Date published: 2017-04-11T00:00:00-04:00
Rated 5 out of 5 by from Works greatWorks great, I would recommend this to all computer users.
Date published: 2011-07-22T00:00:00-04:00
Rated 5 out of 5 by from Excellent productAPC manufactures reliably, robust products that deliver as expected. We will continue to purchase APC products and more importantly, recommend their product line.
Date published: 2014-08-18T00:00:00-04:00