APC Back-UPS uninterruptible power supply (UPS) Standby (Offline) 0.5 kVA 300 W 4 AC outlet(s)

$238.43 (Incl. GST)

or 6 weekly interest-free payments from $39.73 with Laybuy

Back-UPS CS, 500VA/300W, Input 230V/Output 230V, Interface Port DB-9 RS-232, USB

In stock

SKU: APC_BK500EI Category:



APC Back-UPS. UPS topology: Standby (Offline), Output power capacity: 0.5 kVA, Output power: 300 W. AC outlet types: C13 coupler, Power plug: C14 coupler, AC outlets quantity: 4 AC outlet(s). Battery technology: Sealed Lead Acid (VRLA), Battery capacity: 7 Ah, Battery capacity: 83 VAh. Form factor: Tower, Product colour: Beige, Cable length: 1.83 m. Width: 91 mm, Depth: 284 mm, Height: 165 mm

The re-invention of the most relied upon desktop UPS in history: the Back-UPS!
The Back-UPS CS provides professional-grade power protection for office and home office systems. Battery powered & surge protected power outlets, built-in phone/fax/modem line (DSL compatible) protection, safe system shutdown software with sophisticated power management features and pro-active audio-visual status indicators ensure office systems and their valuable data are protected from dangerous power surges, spikes and blackouts. Serial or USB connectivity gives users more flexibility making installation quicker and easier. Easy access to a hot-swappable, user-replaceable battery also makes servicing the Back-UPS CS hassle-free. These features along with its classic styling make the Back-UPS CS a perfect choice for protecting your important office and home office systems.

Key features:
– Audible alarms
– Automatic restart of loads after UPS shutdown
– Automatic self-test
– Battery replacement without tools
– Battery-protected and surge-only outlets
– Dataline Surge Protection
– Hot-swappable batteries
– LED status indicators
– Power conditioning
– Resettable circuit breakers
– Safety-agency approved
– Transformer-block spaced outlets
– User-replaceable batteries

Warranty: 2 years

Additional information

Product colour




Operating temperature (T-T)

0 – 40 °C

Storage temperature (T-T)

-15 – 45 °C

Operating relative humidity (H-H)

0 – 95%

Storage relative humidity (H-H)

0 – 95%

Operating altitude

0 – 3000 m

UPS topology

Standby (Offline)

Output power capacity

0.5 kVA

Output power

300 W

Input frequency

50/60 Hz

Output frequency regulation

47 – 63 Hz

Surge energy rating

310 J

Hold time (min)

6 ms

Hold time (max)

10 ms



Surge protection


Surge protection features

Digital Subscriber Line (DSL), Fax, Modem, Telephone

Power protection features


Audible alarm(s)


Audible alarm modes

Low battery alarm, Overload alarm

AC outlet types

C13 coupler

Power plug

C14 coupler

AC outlets quantity

4 AC outlet(s)

Number of output IEC jumpers


USB port


Battery technology

Sealed Lead Acid (VRLA)

Battery capacity

83 VAh

Battery voltage

12 V

Typical backup time at full load

3.8 min

Typical backup time at half load

13.8 min

Battery life (max)

6 year(s)

Battery recharge time

8 h

Automatic battery test


Form factor


Cable length

1.83 m

LED indicators

Battery replacement


C-tick, CE, EN 50091-1, EN 50091-2, GOST, VDE, REACH

Non-operating altitude

0 – 15000 m

Sustainability certificates

ENERGY STAR, Green Premium, RoHS


91 mm


284 mm


165 mm


6.32 kg

Cables included

Phone (RJ-11), USB cable

Quick installation guide


Warranty card


Software CD


Bundled software

PowerChute Personal Edition

Package width

241 mm

Package depth

368 mm

Package height

178 mm

Package weight

7.05 kg

Products per pallet

48 pc(s)

Nominal output voltage

230 V

Nominal input voltage

230 V





Input operation voltage (min)

160 V

Input operation voltage (max)

300 V

Noise level

40 dB

Products per master (outer) case

1 pc(s)

Packaging content

Detachable 1.2m IEC power cordDetachable 1.8 m IEC power cord

Harmonized System (HS) code