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Acrel Apm521 Timed Data Storage & Transmission Ethernet Enabled Modbus-TCP Network Communication Energy Meter. Dual RS485 + Ethernet + FTP, multi-protocol compatible. 0.2% high accuracy, 0.2S class active energy measurement. Standard 4DI+2DO+2AO, no extra modules needed. EMC Level 4 anti-interference, IP54 front panel protection. UL, CSA & CE certified, compliant with North American standards. Dual installation: 96*96 embedded & DIN rail mount.