Blockbuster New Product | Acrel APM521 Electricity Meter Obtains UL Certification, Quality Upgrade Adds New Strength!

22 09, 2025

Acrel APM521 New Product UL Certification: Embarking on a New Journey in Global Power Monitoring

Against the backdrop of growing global energy management demands and increasingly complex power systems, a precise, reliable, and fully functional power meter is undoubtedly key to ensuring the stable operation of power grids. Today, we are proud to introduce Acrel’s newly launched APM521 network power meter—a high-performance product designed in accordance with IEC international standards and equipped with UL certification, bringing a brand new experience to comprehensive power supply quality monitoring!

UL Certification: A Symbol of International Safety and Quality

UL certification, issued by Underwriters Laboratories, is widely recognized as a standard for product safety and reliability, particularly in the North American market. This certification not only signifies compliance with market access requirements but also represents a high level of achievement in product design, materials, and craftsmanship. The APM521’s UL certification brings the following advantages:

• Smooth Access to the North American Market: Meets mandatory safety requirements for power measurement equipment in the region, removing barriers for Chinese equipment manufacturers and system integrators looking to expand into the North American market.

• Exceptional Safety Performance: The product has undergone rigorous testing in multiple safety indicators, including electrical insulation, flame resistance, and anti-interference capabilities, ensuring long-term stable operation in complex grid environments.

• Enhanced Brand Competitiveness: Boosts the brand reputation and market competitiveness of OEMs, facilitating international project bidding and helping companies stand out in the global market.

APM521 Product Highlights Shine

Dual Installation Options for Multiple Scenarios

The standout feature of the APM521 is its support for both panel-mounted and rail-mounted installation methods. Users can freely choose based on their actual needs, greatly enhancing installation flexibility and applicability. The design of multiple display interface specifications also makes data reading more intuitive, facilitating real-time on-site viewing and debugging. Whether in the complex environments of industrial workshops or the limited space of distribution boxes, the APM521 can easily adapt, providing users with an unprecedented convenient metering experience.

High Precision and Power Quality Analysis

Voltage and current measurement errors are as low as ±0.2%, and energy metering meets the 0.2S class standard, providing a solid data foundation for energy management and electricity cost assessment. Additionally, the meter features power quality monitoring functions such as harmonic and interharmonic analysis, voltage fluctuations, and flicker, helping users fully grasp the health of the power grid. In fields with extremely high power quality requirements, such as data centers and precision manufacturing, the APM521 can accurately monitor, promptly identify, and resolve potential issues, ensuring the stable operation of critical equipment.

Powerful Communication and Integration Capabilities

Supports Modbus-TCP/RTU protocols, enabling seamless integration with energy management systems (EMS), building automation systems (BAS), and industrial Internet of Things (IIoT) platforms for efficient data interconnection. In smart factories, the APM521 serves as an industrial Internet sensing device, transmitting collected power data in real time to upper-level systems. This supports energy monitoring and cost allocation, promoting lean management practices, improving energy utilization efficiency, and reducing operational costs.

Rich Features and Modular Expansion

In addition to basic electrical parameter measurement, the APM521 supports advanced functions such as four-quadrant energy measurement, demand statistics, and event recording. Its modular design allows users to optionally configure various functional modules, easily meeting customized needs. For example, by selecting DI/DO modules and AO modules, comprehensive measurement of electrical circuits and switch status monitoring can be achieved, fulfilling diverse power monitoring requirements across different industries and scenarios.

Broad Application Prospects

The APM521 demonstrates strong applicability across multiple fields:

• North American Market: Suitable for various commercial and industrial buildings, infrastructure, and new energy power stations requiring UL compliance. With its UL certification, the APM521 can seamlessly enter the market, providing reliable power monitoring solutions for local applications.
• High-Standard Data Centers: Offers in-depth power data analysis for data centers with stringent power quality requirements, ensuring the stable operation of critical equipment such as servers and preventing data loss or business interruptions caused by power issues.
• Smart Factories: Functions as an industrial Internet sensing device, supporting energy monitoring and cost allocation. It promotes lean management practices, aids enterprises in transitioning to smart manufacturing, and enhances production efficiency and competitiveness.
• New Energy Sector: Applicable in scenarios such as photovoltaic power stations and energy storage systems, enabling precise metering and coordinated control of power generation, consumption, and storage. This contributes to the healthy development of the new energy industry.

Acrel’s APM521 not only addresses traditional challenges in electricity meter installation but also stands as an indispensable key device in modern power systems, backed by global certifications and centered on high-precision measurement and powerful functionality. Whether improving energy efficiency management or supporting intelligent transformation, the APM521 will deliver true value to users through its exceptional performance and flexibility.