UL Certification
AC Three Phase Measurement
DIN Rail or Panel Mounted Installation Optinal
4DI/2DO
2-63rd Harmonic
RS485 Communication
CE Communication Optional
+86-18702106858 / +86-21-69156352
APM521 network power meter (hereinafter referred to as the meter) is designed according to IEC international standards, featuring full electrical quantity measurement, energy statistics, power quality analysis, event logging functions, and network communication capabilities. It is primarily used for comprehensive monitoring of power supply quality in power grids. This series of meters is equipped with DI/DO modules and AO modules that offer a wealth of functions, allowing for flexible implementation of full electrical quantity measurement and monitoring of switch statuses in electrical circuits.
Functions:
| Measured Parameters | Total electrical measurement |
| Four-quadrant energy、Four - quadrant reactive electric energy、Split phase electricity、Apparent energy、Multi-rate energy | |
| Pulse output | Total active power, total reactive power electrical energy pulse output |
| Demand | Three-phase current, active power, reactive power, apparent power real-time demand and maximum demand (including timestamp), last month's maximum demand (including timestamp). |
| Extreme Value Statistics | Current, line voltage, phase voltage, active power, reactive power and other electrical parameters extreme values of this month and last month (including time stamps) |
| Power quality | Unbalance of current, line voltage, phase voltage |
| Voltage phase angle, current phase angle | |
| Total (odd, even) harmonic content of voltage and current | |
| Harmonic content of voltage and current (2-63 times) | |
| Voltage peak coefficient | |
| Telephone waveform factor | |
| Current K-factor | |
| Vector | |
| Voltage and current waveform | |
| Fundamental voltage ,current and power factor | |
| Voltage deviation, frequency deviation | |
| Positive - sequence voltage, negative - sequence voltage, zero - sequence voltage | |
| Positive - sequence current, negative - sequence current, zero - sequence current | |
| Frozen Electric Energy | 24 - hour frozen electric energy, 31 - day frozen electric energy, December frozen electric energy, regular - time frozen electric energy |
| Event Logging | DIDO records, which can record the last 128 DID records |
| Alarm Logging | The last 128 alarm records can be recorded |
| Communication | Modbus - RTU protocol, DL/T 645-2007 statute |
| Optional Features | 4-channel digital input and 2-channel digital output |
| 2 channels of analog output, 4-20mA | |
| Expand the second RS485 communication channel with Modbus - RTU protocol | |
| Expand Ethernet communication with the MODBUS-TCP protocol，FTP protocol |
| Item | Performance Parameters | |||
| Voltage | Rated voltage（UL、CE） | 66VAC L-N 115VAC L-L | ||
| 230VAC L-N 400VAC L-L | ||||
| 277VAC L-N 480VAC L-L | ||||
| 400VAC L-N 690VAC L-L | ||||
| Rated voltage （CPA） | 3P3L | 3P4L | ||
| 3x100V | 3x57.7/100V | |||
| 3x380V | 3x220/380V | |||
| 3x690V | 3x400/690V | |||
| Overload | 1.2 times rating (continuous) | |||
| 2 times the rating for 1 second | ||||
| Power consumption | <1VA | |||
| Accuracy class | Error ±0.2% | |||
| Current | Rated current（UL、CE） | 1A、5A | ||
| Rated current （CPA） | 0.015-0.075（6）A（Active energy） | |||
| 3X1(6)A（Reactive energy） | ||||
| Overload | 1.2 times rating (continuous) | |||
| 10 times the rating for 1 second | ||||
| Power consumption | <0.2VA | |||
| Accuracy class | Error ±0.2% | |||
| Power | Active, reactive, apparent power, error ±0.2% | |||
| Grid frequency | UL、CE | 50Hz/60Hz, error ±0.2% | ||
| CPA | 50Hz，error ±0.2% | |||
| Response rate | ≤200ms (voltage, current, power) | |||
| ≤1s (electrical energy) | ||||
| Measurement category | 66ULN(＋20%) 115ULL(＋20%) CATⅢ | |||
| 230ULN(＋20%) 400ULL(＋20%) CATⅢ | ||||
| 277ULN(＋20%) 480ULL(＋20%) CATⅢ | ||||
| 400ULN(＋20%) 690ULL(＋20%) CATⅡ | ||||
| Metering | Electric energy | Active energy ：Class D（0.2S） | ||
| Reactive energy (Class 2 accuracy) | ||||
| Auxiliary power supply | AC/DC 85-300V | |||
| Power consumption≤4W、10VA | ||||
| Electromagnetic Compatibility | Electrostatic discharge immunity class IV | |||
| Electrical fast transient burst immunity class IV | ||||
| Surge (shock) immunity Class IV | ||||
| Security | Power frequency withstand voltage | Between communication and signal input, AC4kV 1min | ||
| Insulation resistance | Input and output terminals to casing >500MΩ | |||
| Communication | Interface and communication protocol | RS485 interface, Modbus RTU protocol | ||
| Communication address range | Modbus RTU:1~ 247； | |||
| Baud rate | Support 1200bps-38400bps | |||
| Environment | Operating temperature | -40℃～+70℃ | ||
| Storage temperature | -40℃～+80℃ | |||
| Relative humidity | ≤95% (without condensation) | |||
| Altitude | ≥2000m，≤5000mOnly applicable to the power supply with the voltage range of AC/DC 85-265V and the voltage below 277/480V. | |||
| Installation environment | Indoor use（dry location） | |||
| IP rating | IP54(Front panel),IP30(Body) | |||
| Pollution degree | Class 2 | |||
| Overvoltage categories | OVC III | |||
| Reference Standard | UL | CAN/CSA C22.2 NO.61010-1-12 | ||
| UL 61010-1 | ||||
| CSA C22.2 No.61010-2-030 | ||||
| UL 61010-2-030 | ||||
| IEC、CE | IEC 61010-1 | |||
| IEC EN 61010-2-30 | ||||
| CPA | GB/T17215.321-2021 | |||
| GB/T17215.323-2022 | ||||
Power Monitoring Solution
Renewable Energy
Rated Current 80A Directly
MID Certificated
High Accuracy Class C
35mm DIN Rail Mounted
Pulse Output
4 Modules 72mm Width
For IoT Energy Management, Factory, School
Split Core
Clamp on Installation
High Accuracy Class 0.5
150-1000A Input Current
5A/1A Secondary Output
Application: Renovation Projects
Event recording
Start control function
programmable DI and DO
Profibus-DP communication
Anti-shaking function
Analog output
Event recording
leakage protection
AC380V/690V
programmable DI and DO
Analog output
Anti-shaking function
Split Core
High Accuracy Class 0.5
Current Input 20-6000A
Current Output 5(1)A
Rectangular Hole Design
Measurement of current (I)
Application: Renovation Projects
Founded in 2003, Acrel Co., Ltd.【Stock Code: 300286.SZ】 is a high-tech enterprise specializing in energy management solutions and electrical safety. Headquartered in Shanghai, Acrel offers innovative and sustainable solutions for microgrid energy efficiency and electrical safety. With over 600 patents and software copyrights, Acrel has deployed more than 28,000 system solutions globally, forming a comprehensive "cloud-edge-end" energy internet architecture.
Acrel Co., Ltd. is China Wholesale UL Certified High Accuracy Class 0.2S AC Three Phase Energy Meter Manufacturers and UL Certified High Accuracy Class 0.2S AC Three Phase Energy Meter Factory. Acrel's integrated product ecosystem spans from cloud platform software to end-user components, covering sectors such as power, renewable energy, data centers, smart buildings, transportation, and smart cities. These solutions enable intelligent, real-time energy management, enhancing energy security and reducing operational costs. We offer UL Certified High Accuracy Class 0.2S AC Three Phase Energy Meter for sale.
The company's production facility, Jiangsu Acrel Electric Manufacturing Co., Ltd., adheres to strict quality standards and environmental guidelines, with advanced testing centers and a commitment to lead-free production processes. Acrel's team of over 500 engineers delivers cutting-edge energy efficiency systems and smart energy solutions.
With a strong domestic presence, Acrel is actively expanding internationally, supported by a global network of sales and technical teams and an e-commerce platform that ensures seamless service experiences worldwide. Acrel is proud to help businesses improve efficiency, reduce consumption, and achieve sustainability goals.
Together, we are building a smarter, greener future.
Authorized Patents
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Number of Customers Served
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Total Employees
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Manufacturing Base
0m²Empowering businesses with our robust capabilities.
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Email: [email protected]
Phone: +86-18702106858 / +86-21-69156352No.253 Yulv Road, Jiading District, Shanghai, PRC 201801
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