CyberPower ST425 Standby UPS - 425VA/260W - 120VAC - Compact - 8 Outlets - 4 Battery+Surge - 4 Surge-only - 3-Year Warranty
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Product Features
Product Overview
The CyberPower ST425 Standby UPS delivers reliable battery backup and surge protection for essential electronics in home, office, and networking environments. This compact unit provides 425VA/260W of power capacity with a 120VAC input/output design, ensuring compatibility with standard North American outlets. Its standby topology and simulated sine wave output offer cost-effective protection for sensitive equipment like desktop computers, VoIP systems, routers, gaming consoles, and entertainment devices.
Engineered with GreenPower UPS™ high-efficiency technology, the ST425 minimizes energy waste while maintaining robust surge suppression across all eight outlets. The unit includes four battery-backed surge outlets and four surge-only outlets, providing flexible power distribution for both critical and non-critical devices. With a compact footprint and black finish, it blends seamlessly into most office and home environments while offering practical protection against power interruptions and voltage fluctuations.
The ST425 is ENERGY STAR® qualified, reflecting its efficient operation and reduced environmental impact. Its design incorporates EMI/RFI noise filtering to deliver clean power to connected electronics, protecting against electrical interference that can damage sensitive components. The included audible alarm and LED status indicators provide clear notifications during battery mode operation, ensuring users are aware of power conditions without requiring complex monitoring systems.
Technical Overview
The ST425 employs a single sealed lead-acid battery (12V, 2900 mAh) that provides backup runtime of 1.5 minutes at full 260W load and 6 minutes at half 130W load. Its input voltage range of 96-140VAC handles typical line variations, while the output maintains 120VAC ±5% with frequency support for both 50Hz and 60Hz systems. The simulated sine wave output is compatible with most modern switching power supplies, though users should verify compatibility with equipment requiring pure sine wave power.
Management features include an audible alarm for battery mode notification and LED indicators for power status. The unit includes a standard USB port for basic connectivity, though it does not support HID-compliant communication for advanced monitoring. Environmental specifications allow operation from 32°F to 104°F (0°C to 40°C) and up to 10,000 feet elevation, making it suitable for various installation environments. The output power factor of 0.6 ensures efficient power conversion, while the circuit breaker provides overload protection to prevent damage from excessive current draw.
The technical design incorporates multiple protection layers, including surge suppression on all outlets and EMI/RFI filtering to reduce electrical noise. The 8 ms transfer time ensures minimal interruption during power transitions, while the non-replaceable battery design simplifies maintenance. The unit meets RoHS environmental compliance standards and carries a $75,000 connected equipment guarantee in addition to the standard 3-year warranty, providing comprehensive protection for connected devices.
Key Product Advantages
The ST425 combines essential UPS functionality with practical design choices for everyday use. Its compact footprint and 3.8-pound weight make it easy to place on desks, shelves, or in tight spaces without sacrificing outlet count. The black finish blends with most office and home environments while the included user manual ensures straightforward setup.
Comprehensive Outlet Protection
Four battery-backed surge outlets and four surge-only outlets provide flexible power distribution for critical and non-critical devices.
- 8 total NEMA 5-15R outlets
- Dedicated battery backup for essential equipment
- Surge protection on all outlets
Efficient Power Management
GreenPower UPS™ technology reduces energy consumption while maintaining protection, complemented by EMI/RFI filtering for clean power delivery.
- ENERGY STAR® qualified
- High-efficiency operation
- Noise filtering for sensitive electronics
Deployment / Use Cases
This standby UPS is particularly effective for electronics that don't require extended runtime but benefit from surge protection and brief battery backup. The 425VA/260W capacity suits typical desktop setups with a monitor and peripherals, while the eight outlets accommodate additional devices like printers, speakers, or charging stations.
For small business environments, the ST425 provides cost-effective protection for point-of-sale systems, security system components, or conference room equipment. Its simulated sine wave output is compatible with most switching power supplies found in modern electronics, though users should verify compatibility with sensitive medical or laboratory equipment.
Home Office & Desktop Protection
Safeguard computers, monitors, and external drives from power interruptions during critical work, with sufficient runtime for graceful shutdowns.
Network & VoIP Infrastructure
Maintain connectivity for routers, modems, and VoIP phones during brief outages, preventing dropped calls and network downtime.
Physical Profile
The compact design measures 4.50 inches tall, 8.30 inches wide, and 3.20 inches deep, with a weight of 3.80 pounds. This form factor fits easily under desks, on shelves, or behind entertainment centers without occupying excessive space. The black housing maintains a professional appearance while the front-panel LED provides clear status indication at a glance.
The physical profile is practical for deployment planning because the dimensions and weight are clearly defined: 4.50" (114.30 mm), 8.30" (210.82 mm), 3.20" (81.28 mm), 3.80 lb (1723.65 g). This helps confirm rack, shelf, desk, or cabinet fit before installation.
- Width
- 8.30" (210.82 mm)
- Depth
- 3.20" (81.28 mm)
- Height
- 4.50" (114.30 mm)
- Weight
- 3.80 lb (1723.65 g)
- Length
- 5 ft (1.52 m)
What's in the Box
Each ST425 package includes the complete UPS unit with attached 5-foot power cord and a comprehensive user manual for installation and operation guidance. The manual provides detailed instructions for setup, troubleshooting, and warranty registration, ensuring users can deploy the UPS correctly and access all available protections.
Highlights
- 425VA/260W standby UPS with 120VAC input/output
- 8 total outlets: 4 battery+surge, 4 surge-only
- Compact design: 4.5"H × 8.3"W × 3.2"D
- Backup runtime: 1.5 min (full load), 6 min (half load)
- Includes EMI/RFI noise filtering and surge suppression
- GreenPower UPS™ high-efficiency, ENERGY STAR® qualified
- 3-year warranty with $75,000 connected equipment guarantee
- Sealed lead-acid battery, 8-hour typical recharge
Specifications
| Specifications | |
|---|---|
| Manufacturer | CyberPower Systems, Inc |
| Manufacturer Part Number | ST425 |
| Brand Name | CyberPower |
| Product Series | Standby UPS |
| Product Model | ST425 |
| Product Name | ST425 Standby UPS Systems |
| Product Type | Standby UPS |
| Technical Information | |
| Plug/Connector Type | NEMA 5-15P |
| Receptacle Type | NEMA 5-15R |
| Receptacle Detail | 8 x NEMA 5-15R |
| Number of Battery & Surge Outlets | 4 |
| Number of Surge-only Outlets | 4 |
| Overload Protection | Yes |
| Cord Length | 5 ft (1.52 m) |
| Transfer Time | 8 ms |
| EMI/RFI Noise Filter | Yes |
| Energy Saving | GreenPower UPS™ High-Efficiency |
| Application/Usage | Electronic Equipment,Desktop Computer,VoIP,Network,Home,Office,Entertainment,Gaming Console,Router |
| Surge Suppression | Yes |
| Features | Audible Alarm |
| Power Description | |
| Load Capacity (VA) | 425 VA |
| Load Capacity (Watt) | 260 W |
| Input Voltage | 120 V AC |
| Input Voltage Range | 96 V AC - 140 V AC |
| Output Voltage | 120 V AC |
| Input Frequency | 47 Hz,63 Hz |
| Output Frequency | 50 Hz,60 Hz |
| Waveform Type | Simulated Sine Wave |
| Circuit Breaker | Yes |
| Output Power Factor | 0.6 |
| Management | |
| Alarm | Battery Mode |
| Controls/Indicators | |
| Status Indicators | LED Indicators: Power On |
| Interfaces/Ports | |
| USB | Yes |
| USB (HID Compliant) Port | No |
| Battery Information | |
| Number of Batteries | 1 |
| Battery Characteristics | Sealed |
| Battery Chemistry | Lead Acid |
| Battery Size | 12V |
| Battery Capacity | 2900 mAh |
| Backup/Run Time (Full Load) | 1.50 Minute |
| Backup/Run Time (Half Load) | 6 Minute |
| Hot Swappable | No |
| Typical Battery Recharge Time | 8 Hour |
| Replaceable Battery | No |
| Environmental Conditions | |
| Maximum Operating Elevation | 10000 ft (3048000 mm) |
| Maximum Storage Elevation | 50000 ft (15240000 mm) |
| Minimum Operating Temperature | 32°F (0°C) |
| Maximum Operating Temperature | 104°F (40°C) |
| Physical Characteristics | |
| Product Color | Black |
| Height | 4.50" (114.30 mm) |
| Width | 8.30" (210.82 mm) |
| Depth | 3.20" (81.28 mm) |
| Form Factor | Compact |
| Weight (Approximate) | 3.80 lb (1723.65 g) |
| Miscellaneous | |
| Package Contents | Standby ST425 425VA Compact UPS User Manual |
| Energy Star | Yes |
| Country of Origin | China |
| Environmentally Friendly | Yes |
| Environmental Compliance | Restriction of Hazardous Substances (RoHS) |
| Warranty | |
| Limited Warranty | 3 Year |
User Manual
FAQ
What is the power capacity of the CyberPower ST425 UPS?
The CyberPower ST425 provides 425VA/260W of power capacity, suitable for protecting essential electronics like desktop computers, networking equipment, and home office devices from power interruptions and surges.
How many outlets does this UPS have and what types are they?
This unit features eight NEMA 5-15R outlets: four provide battery backup and surge protection for critical devices, while four offer surge-only protection for non-critical equipment, giving you flexible power distribution options.
What is the backup runtime at full and half load?
At full 260W load, the ST425 provides approximately 1.5 minutes of backup time. At half load (130W), runtime extends to about 6 minutes, giving you sufficient time for graceful shutdowns or to ride through brief power interruptions.
What type of power waveform does this UPS produce?
The ST425 generates a simulated sine wave output, which is compatible with most modern switching power supplies found in computers, networking gear, and consumer electronics. Users should verify compatibility with equipment requiring pure sine wave power.
What management and monitoring features are included?
The unit includes an audible alarm for battery mode notification and LED status indicators for power status. It features a standard USB port for basic connectivity, though it does not support HID-compliant communication for advanced monitoring software.
What warranty and protection guarantees come with this UPS?
CyberPower backs the ST425 with a 3-year limited warranty and a $75,000 connected equipment guarantee, providing comprehensive protection for your connected devices against damage from power surges and UPS malfunctions.
| Qty | Price | Available |
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