The APM521 multi-function meter is designed according to UL/IEC standards, integrating power parameter measurement, power quality analysis, alarm functions, and I/O. It features a large LCD display supporting both Chinese and English, simple and quick operation and setup, and supports multiple communication protocols. It is widely used in industrial applications and various critical power applications to monitor the operational efficiency of power distribution equipment.
High-Precision Measurement: Active energy accuracy at level 0.2s (Class D)
Extensive Storage Functions: Real-time electrical parameters stored on SD card
Diverse Structures: Main unit + slave module design, supporting both embedded and DIN rail mounting methods
Phase Sequence Self-Diagnosis: Equipped with phase sequence diagnosis to identify abnormal conditions such as phase reversal and reverse CT connection.
The APM521 is a high-precision network power meter designed according to IEC international standards. Its main functions include:
Comprehensive Power Measurement: Supports high-precision measurement of voltage, current, active power, reactive power, apparent power, and electrical energy, with an error controllable within ±0.2%.
Power Quality Monitoring: Equipped with harmonic analysis, unbalance monitoring, voltage fluctuation and frequency deviation detection functions, enabling real-time assessment of power system operating quality.
Event and Data Logging: Supports extreme value statistics, alarms, and event logging, and can store data and transmit remotely via MicroSD card and Ethernet interface.
Multiple Communication Protocols: Built-in RS485 interface, compatible with Modbus RTU protocol; optional modules can expand Ethernet communication (MODBUS TCP, FTP), facilitating seamless integration with mainstream international power automation systems.
In addition, the APM521 is designed to support a wide range of AC/DC 85300V auxiliary power supply, with an operating temperature range of 40℃ to +70℃, and an IP54 front panel protection rating, ensuring reliable operation in different countries and complex power grid environments.
Embedded mounting dimensions (without module)
Embedded mounting dimensions (with module)
Rail mounting dimensions (without modules)
Rail mounting dimensions (with modules)
Amid the global energy transition and the wave of "going global," Acrel's APM521 series of multi-functional power meters has successfully entered the high-end markets of Europe and America with its UL certification, a "passport to international standards."
This meter is designed strictly according to IEC international standards, achieving a measurement accuracy of up to 0.2S class. It can accurately monitor voltage, current, and 2nd-63rd harmonics, providing real-time diagnosis of power quality. It supports communication protocols such as Modbus-RTU and Ethernet, facilitating seamless integration with mainstream international energy management systems. Its wide temperature range (-40℃~+70℃) and IP54 protection rating allow it to confidently handle various complex environments.
From industrial parks to overseas photovoltaic projects, the APM521, with its internationally certified reliability and high accuracy, has earned Chinese manufacturing a solid voice in the global electricity market.
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