• EMI (Electromagnetic Interference): The electromagnetic noise a device emits to its surroundings
• EMS (Electromagnetic Susceptibility): The device’s ability to withstand external electromagnetic disturbances

To meet increasing market requirements, ARCH has upgraded the EMC performance of the AQF1000 and AQF1000C series, strengthening both EMI control and Surge immunity—one of the most impactful and critical EMS tests. This article highlights the key improvements and the benefits they bring to system-level design.

Key Upgrade Highlights: EMI Class B & ±4kV Surge Immunity

This upgrade focuses on two major enhancements:

1. EMI Upgraded from EN55032 Class A → Class B
   • Before Upgrade (Original AQF1000 / AQF1000C):
     Compliant with EN55032 Class A
   • After Upgrade (New AQF1000 / AQF1000C):
     Conducted (CE) and Radiated (RE) emissions upgraded to Class B, delivering stricter noise suppression.

   Benefits of Class B EMI performance include:

   • Improved noise attenuation
   • Better compatibility in multi-device environments
   • Higher success rate in system-level EMC certification
   • Potential reduction in external filters and EMI design cost
2. Surge Immunity Improved from ±2kV → ±4kV (L/N–PE)
   • Before Upgrade: ±2kV surge protection
   • After Upgrade: ±4kV surge protection, providing double the surge robustness

   Common surge sources include lightning-induced transients, outdoor power fluctuations, and motor startup events. The enhanced ±4kV immunity helps:

   • Improve resilience in outdoor and industrial environments
   • Reduce system resets or failures caused by surge events
   • Increase long-term reliability and lower maintenance costs

Before vs. After Upgrade Comparison

No mechanical redesign or PCB modification is required—customers can adopt the upgraded version seamlessly while achieving higher EMC performance.

Core Advantages Retained in the AQF1000 / AQF1000C Series

In addition to the significant EMC enhancements, the products continue to retain the following key features:

• 4300VAC Isolation
  High dielectric strength suitable for safety-critical industrial and telecom equipment.
• 5000m Operating Altitude Capability
  Ideal for mountain regions, outdoor cabinets, and remote communication stations.
• High Efficiency up to 93%
  Reduces heat generation and improves thermal performance in compact enclosures.
• Comprehensive Protection (OVP / OPP / OTP / SCP)
  Ensures stable operation under various fault conditions.
• Ultra-Compact Size (7.6" × 4.02" × 1.62")
  Fully compatible with previous models for effortless upgrade

Additional Advantage of the AQF1000C: Current Share for Parallel & Redundant Systems

Beyond the EMI/Surge upgrade, the AQF1000C offers:

• Current Share Function

Enabling:

• Power expansion (two units reaching up to 1800W)
• N+1 redundancy for high-availability applications

This makes the AQF1000C especially suitable for servers, telecom systems, edge computing, and mission-critical industrial equipment.

Three Practical Benefits for System Designers

1. Easier System-Level EMC Certification
   Class B performance provides greater EMI margin, potentially reducing external filtering costs.
2. Stronger Lightning and Switching Surge Resistance
   ±4kV Surge immunity ensures stable operation in outdoor and industrial environments.
3. Enhanced Competitiveness & Broader Application Coverage
   Higher EMC levels expand suitability for noise-sensitive, outdoor, telecom, and automation applications.

Conclusion：Stricter EMC for More Reliable Power System Design

With this upgrade, the AQF1000 and AQF1000C series not only maintain ARCH’s hallmark stability and power density but also deliver significantly stronger resistance to electromagnetic disturbances and surge events. Whether used in industrial automation, communication systems, servo control, outdoor power, or general automation, this enhancement provides a higher level of reliability and protection for your products.

Learn more about the AQF1000(C) AC-DC switching power supply.

Contact Us for Tailored Power Recommendations

About ARCH Electronics Corp.

Founded in 1986, ARCH Electronics Corp. is a leading designer and manufacturer of energy-efficient power solutions. Headquartered in Taiwan with its own manufacturing facilities, ARCH offers an extensive portfolio that includes encapsulated AC/DC power supplies, DC/DC converters, and specialized medical modules.

With a focus on customization, ARCH provides OEM/ODM solutions tailored to meet the specific needs of customers across the Americas, Europe, and Asia. Certified under international standards such as ISO 9001, CE, UL, and TUV, ARCH is committed to continuous innovation, energy efficiency, and sustainability.