APM521網(wǎng)絡(luò)電力儀表（以下簡稱儀表）按IEC國際標(biāo)準(zhǔn)設(shè)計，具有全電量測量、電能統(tǒng)計、電能質(zhì)量分析事件記錄功能及網(wǎng)絡(luò)通訊等功能，主要用于電網(wǎng)供電質(zhì)量的綜合監(jiān)控。該系列儀表配有功能豐富的DI/DO模塊、AO模塊，可以靈活實(shí)現(xiàn)電氣回路全電量測量及開關(guān)狀態(tài)監(jiān)控。

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.

多功能性：支持四象限電能、諧波分析、需量統(tǒng)計、事件記錄等，滿足多樣化電力監(jiān)測需求。

精度高：電壓、電流測量誤差±0.2%，電能計量符合D級標(biāo)準(zhǔn)，確保數(shù)據(jù)準(zhǔn)確性。

靈活安裝：提供嵌入式、導(dǎo)軌式等多種安裝方式，適配不同場景需求。

安全可靠：通過UL、CE等認(rèn)證，符合CATⅢ/CATⅡ安全標(biāo)準(zhǔn)，具備過載保護(hù)和雙重絕緣設(shè)計。

通信便捷：支持Modbus-RTU、DL/T 645-2007等多種協(xié)議，兼容RS485和以太網(wǎng)通信，便于系統(tǒng)集成。

擴(kuò)展性強(qiáng)：可選配DI/DO模塊、AO模塊，實(shí)現(xiàn)開關(guān)狀態(tài)監(jiān)控和模擬量輸出，滿足定制化需求。適用于工業(yè)、商業(yè)及電力系統(tǒng)，提供準(zhǔn)確的電力監(jiān)控解決方案。

Versatility: Supports four-quadrant energy measurement, harmonic analysis, demand statistics, event recording, and more, meeting diverse power monitoring needs.

High Accuracy:  Voltage and current measurement error within ±0.2%, with energy measurement complying with Class D standards, ensuring data accuracy.

Flexible Installation: Offers multiple installation methods, including embedded and DIN rail mounting, to adapt to different application scenarios.

Safety and Reliability: Certified by UL, CE, and others, compliant with CAT III/CAT II safety standards, featuring overload protection and double insulation design.

Convenient Communication:  Supports multiple protocols such as Modbus-RTU and DL/T 645-2007, compatible with RS485 and Ethernet communication for easy system integration.

Strong Expandability: Optional DI/DO and AO modules for switch status monitoring and analog output, meeting customized requirements. Suitable for industrial, commercial, and power systems, providing accurate power monitoring solutions.