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APM521 Three Phase Multifunction Meter
High Accuracy；Support Modbus-RTU/TCP Protocol
The 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.
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Main Feature
● Measured all electrical parameters
● Measured Demand
● Demands and Multi-Tariff energy
● Max/Min Log with Timestamp
● Alarms and SOE Logs
● External Option module
● 0.2 Class
● Alarms and SOE Logs
● RS485 MODBUS RTU
● Other option(second RS485, analog output)
Appearance
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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 |
Specifications
| 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 | ||
| Power consumption | <0.2VA | |||
| Accuracy class | Error ±0.2% | |||
| CPA | 50Hz，error ±0.2% | Grid frequency | ||
| 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 | ||||
Wiring
Installation
Typical Connection
Product Application
Acrel ADW600 Multi Channels Smart 3 Phase Energy Meter
Optional 4DI2DO,12 channels temp measure,4 channels Residual current monitoring
AM6 Prefabricated Substation Protection & Control Device
2 × 4–20 mA DC measurement channels and 3 temperature measurement channels
ATU Intelligent Monitoring Terminal for Switchgear
Conduct centralized monitoring and management.
AMC300L Base Station AC Multi-loop Intelligent Power Collection and Monitoring Device
6 channel 3 phase or 18 channel 1 phase
Acrel ADW600 Multi Channels Smart 3 Phase Energy Meter
With Different Size of CTs,easy to install D10,D16,D24,D36
Acrel ADW600 Multi Channels Smart 3 Phase Energy Meter
Optional 4DI2DO,12 channels temp measure,4 channels Residual current monitoring
AM6 Prefabricated Substation Protection & Control Device
2 × 4–20 mA DC measurement channels and 3 temperature measurement channels
ATU Intelligent Monitoring Terminal for Switchgear
Conduct centralized monitoring and management.
AMC300L Base Station AC Multi-loop Intelligent Power Collection and Monitoring Device
6 channel 3 phase or 18 channel 1 phase
Acrel ADW600 Multi Channels Smart 3 Phase Energy Meter
With Different Size of CTs,easy to install D10,D16,D24,D36
Acrel ADW600 Multi Channels Smart 3 Phase Energy Meter
Optional 4DI2DO,12 channels temp measure,4 channels Residual current monitoring
AM6 Prefabricated Substation Protection & Control Device
2 × 4–20 mA DC measurement channels and 3 temperature measurement channels
ATU Intelligent Monitoring Terminal for Switchgear
Conduct centralized monitoring and management.
Inquiry
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