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APC Smart-UPS SC 420VA Tower Line-Interactive UPS with Voltage Stabiliser

Protects a computer workstation with 260 W usable and 4 C13 outlets, 3 of them battery-backed and 1 surge-protected. RS-232 port for automatic PC shutdown.

  • 260 W usable — a desktop PC and its monitor
  • Outlets: 4 C13, 3 battery-backed and 1 surge-protected only
  • DB-9 RS-232 port for automatic, clean PC shutdown
  • Status indicators and audible alarm (battery mode, battery to be replaced, overload)
  • Compact weight of 9.1 kg
Ref.: SC420I
APC Smart-UPS SC 420VA Tower Line-Interactive UPS with Voltage Stabiliser — image 1
APC Smart-UPS SC 420VA Tower Line-Interactive UPS with Voltage Stabiliser — image 2

Non-contractual photos

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No exchange, return or cancellation will be accepted on the grounds that something seen in a photo (accessory, port, colour, keyboard layout, packaging…) is not found on the delivered product. Only the specifications written on the page are binding for the order.

What the image does not guarantee:

  • Outlets : the number and type of outlets (Schuko, IEC) vary between versions of a single photographed series.
  • Options : LCD display, USB or RJ45 port, SNMP network card and rack kit are supplied only if the specifications say so.
  • Batteries : the additional battery modules photographed next to the UPS are sold separately.
  • Runtime : it depends on the load actually plugged in, never on what the image shows.
  • Colour : one image often serves several colours, and the shade you see depends on studio lighting as much as on your screen settings; the colour sold is the one in the title and the specifications.
  • Props and accessories : the items shown around the product (cables, stands, decorative objects, content displayed on screen) are not included unless explicitly stated.
  • Packaging : boxes, labels and bundles change with the manufacturer's revisions: the packaging delivered may differ from the one in the photo.

What is binding: the product title, this page's technical specifications, the description and, when provided, the manufacturer's PDF datasheet available in the downloads.

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2 899,00 DHincl. VAT

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Manufacturer's datasheetView the PDF · 716 Ko — downloadable

Product overview

Compact tower UPS to protect a computer workstation: line-interactive with voltage stabiliser and 420 VA / 260 W.
Technology & protection: it takes over on battery the instant the power cuts out, absorbs surges and stabilises the voltage to deliver steady power.
Power: 420 VA for 260 W of usable output — a desktop PC and its monitor.
Outlets: 4 C13 outlets (the format used on computer and server power cords) — 3 with battery backup, 1 surge-protected.
Management: RS-232 serial port for automatic PC shutdown, plus status LEDs.
Ideal, for example, for an office workstation, a desktop PC and its monitor, or a small switch.
Remember to check how much power your equipment draws and to choose the capacity according to the runtime you need.

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Technical specifications

Technical specifications
Output voltage230V
Output connections(1) x IEC 320 C13, (3) x IEC 320 C13 (Battery backup)
Input voltage230V
Input frequency50/60 Hz +/- 3 Hz (auto-sensing)
Input connectionsIEC-320 C14
Voltage range160-286 V
Automatic voltage regulation (AVR)AVR (automatic voltage regulation)
Battery typeSealed maintenance-free lead-acid batteries, with suspended electrolyte
Battery managementAutomatic self-test at start-up, then every two weeks
Typical recharge time3 hours
Interface port1 RS-232 DB-9 serial port (cable included)
User interfaceIlluminated display with operation, battery mode, replace battery and overload indicators
Audible alarmAlarm when switching to battery (adjustable delay of 5 or 30 s), audible alarm 2 minutes before the end of runtime
Power management softwarePowerChute Business Edition
Technical specifications (continued)
Weight (kg)9.09 kg
Dimensions (W x D x H) (mm)119 x 368 x 168 mm
TechnologyLine Interactive
Power (VA)420 VA
Voltage stabiliserYes
Box contentsProduct, safety and warranty documentation · Smart-UPS manuals CD · PowerChute Business Edition CD · Serial communication cable · Two jumper cables and power cord (230 V models)
Data line protectionRJ11 / RJ45 sockets (in and out) for phone line and 10 Base-T / 100 Base-Tx network
Cold startYes
Output typeC13 outlets
Power (W)260 W
Form factorTower
Battery-backed outlets3 to 4 outlets
Control & communicationRS232 serial port
Warranty2 years

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Under Law 09-08, you have the right to access, rectify and object to the processing of your personal data. This processing has been authorised by the CNDP under no. D-CE-389/2015. Learn more

Frequently asked questions about this product

Can the Smart-UPS SC 420 be controlled via USB?
It has a DB-9 RS-232 serial port, and that is what handles automatic shutdown of the computer. On a recent computer without a serial port, you will need a USB-to-serial adapter to use this function.
How many of the four outlets are backed by the battery?
Three. The fourth C13 outlet is surge-protected only and switches off with the mains. Keep the first three for the system unit and the monitor.
What can you plug into a 420 VA unit?
260 W in total: a desktop PC and its monitor, no more. It is this wattage that you should compare with your equipment, never the 420 VA shown in the title.
Over what voltage range does the stabiliser operate?
Between 160 and 286 V, on a frequency detected automatically at 50 or 60 Hz ±3 Hz. As long as the mains stays within it, the battery is not called upon: this is what a line-interactive unit does that an off-line one does not.
What does the UPS show during a power cut?
An illuminated display with four indicators — online, on battery, replace battery, overload — backed by an audible alarm. Enough to know where things stand without any software.
How long does it take to recharge the battery?
3 hours — remarkably fast for this category. It is a sealed, maintenance-free lead-acid battery with suspended electrolyte, the unit's wear part.
How much space does the Smart-UPS SC 420 take up?
119 × 368 × 168 mm and 9.1 kg, in a compact tower format. That is heavy for its size: the weight comes from the lead-acid battery, and it is better placed on the floor than up high.
Is the APC Smart-UPS SC 420 new and under warranty?
Yes, new equipment, with the invoice serving as the warranty document for 2 years. It has four C13 outlets with a C14 input: make sure you have IEC cords for your machines. The datasheet details the rest.

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