CyberPower ST425 8-Outlet Standby UPS

BH #CYST425 • MFR #ST425
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CyberPower ST425 8-Outlet Standby UPS
Key Features
  • 425VA / 260W Simulated Sine Wave UPS
  • 8 x NEMA 5-15R Outlets
  • EMI/RFI Filters
  • Recharge Time: 8 Hours
The ST425 Standby UPS from CyberPower provides you with battery backup power and surge protection to ensure your devices stay operational in critical situations. It's equipped with eight NEMA 5-15R outlets, some of which are spaced to better fit larger plugs. The eight outlets deliver a surge rating of 890 joules, and four of these outlets are powered by an internal battery that grants connected equipment a full-load runtime of up to 1.5 minutes in the event of a power failure. Other notable features include onboard LED indicators and audible alarms to alert you when a situation does occur. In addition, the UPS comes with EMI/RFI filtration.
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CyberPower ST425 Overview

The ST425 Standby UPS from CyberPower provides you with battery backup power and surge protection to ensure your devices stay operational in critical situations. It's equipped with eight NEMA 5-15R outlets, some of which are spaced to better fit larger plugs. The eight outlets deliver a surge rating of 890 joules, and four of these outlets are powered by an internal battery that grants connected equipment a full-load runtime of up to 1.5 minutes in the event of a power failure. Other notable features include onboard LED indicators and audible alarms to alert you when a situation does occur. In addition, the UPS comes with EMI/RFI filtration.

Battery Backup
Supplies power long enough for equipment to properly shut down when utility power fails, thereby preventing loss of data and minimizing component stress caused by a hard shutdown.
Surge Protection
Diverts excess voltage away from sensitive electronic equipment during an AC power surge or power spike to prevent damage.
Simulated Sine Wave Output
Uses pulse-wave modulation to generate a stepped, approximated sine wave to supply cost-effective battery backup power for equipment that does not require sine wave output.
GreenPower UPS High-Efficiency Design
Reduces power consumption, utilizing a compact charger and power inverter to create an efficient backup power system for home and office use.
Connected Equipment Guarantee
CyberPower will repair or replace properly-connected equipment (up to $75,000) if damaged by a power surge.
UPC: 649532621507

CyberPower ST425 Specs

Key Specs
Total Outlets
8x NEMA 5-15R
Plug Type
NEMA 5-15P Offset Right-Angle
Surge Protection
Yes: 890 Joules
Maximum Wattage
260 W
Full-Load Runtime
1.5 Minutes
General
Total Outlets
8x NEMA 5-15R
Protected Outlets
4x NEMA 5-15R (Surge Only)
4x NEMA 5-15R (Battery and Surge)
Plug Type
NEMA 5-15P Offset Right-Angle
USB Charging Ports
No
Communications I/O
No
Topology
Standby
Transfer Time
< 8 ms
Power
Surge Protection
Yes: 890 Joules
Current
7 A
Maximum Wattage
260 W
Input Voltage Range
96 to 140 VAC
Input Voltage Adjustable Range
47 to 63 VAC
Nominal Output Voltage
120 VAC
Output Frequency
50/60 Hz ± 1%
Load Capacity
425 VA
Waveform
Simulated Sine Wave
Battery
Battery Capacity
(34.8 VaH)
Chemistry
Lead-Acid
Full-Load Runtime
1.5 Minutes
Half-Load Runtime
6 Minutes
Recharge Time
8 Hours
Number of Batteries
1
User Replaceable
No
Physical
Operating Conditions
32 to 104°F / 0 to 40°C up to 95% Humidity
Certifications
CEC, FCC, RoHS, UL, cUL
Cable Length
5' / 1.52 m
Rackmount Size
No
Dimensions (W x H x D)
8.3 x 4.5 x 3.2" / 210.82 x 114.3 x 81.28 mm
Weight
3.8 lb / 1.72 kg
Packaging Info
Package Weight
4.23 lb
Box Dimensions (LxWxH)
12.5 x 6.5 x 4.5"

CyberPower ST425 Reviews

Works well with FIOS ONT

By SAMUEL
Rated 5 out of 5
Date: 2025-12-26

Works well with the FIOS ONT and Unifi POE switch in garage networking cabinet. Physical size is very convenient and it is the main reason why I chose this model. So far so good.

Lightweight and Quiet

By Zack
Rated 5 out of 5
Date: 2024-10-08

I was surprised at how lightweight this unit was, but it's still getting the job done. I didn't need a larger unit as I just need a few minutes to switch devices over to a larger battery solution if needed. Bonus that the alarm can be shut off. I ran a quick test, and was able to pull 150 watts for 5 minutes before it shut off, more than enough for my needs.

See any errors on this page?

can you turn off beeps and such so it can be used ...

can you turn off beeps and such so it can be used in a bedroom?
Asked by: Elliott
The audible alarm can be turned OFF or ON by quickly pressing the POWER button twice. To turn the Alarm Off, quickly press the power button twice. You will hear two short beeps when the Alarm is turned off. To turn the Alarm back ON, quickly press the power button twice. You will hear a single short beep when the Alarm is turned on. *When the Alarm is turned off, there will be no audible notification when the UPS reaches a low battery state. Thank you for your question!
Answered by: TechSupport
Date published: 2025-11-12
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