Current transformer clamp for Shelly Pro 3 EM-400. Rated primary current: 400 A. Rated secondary current: 40 mA. Accuracy: 1%. Can measure up to 400 A for each phase and the neutral conductor. 4-quadrant measurement with multiple connection types. Phase sequence error detection (optional). The Shelly Pro 3EM 400A is a Wi-Fi-operated, DIN-mountable 3-phase power consumption meter with Wi-Fi, Bluetooth, and LAN connectivity. With its active energy measurement accuracy of 1%, the Shelly Pro 3EM can be used to monitor the consumption of all household appliances, circuits, and office devices individually. Historical data is stored for up to 60 days, with each phase having a one-minute resolution. Additionally, the scripting functionalities allow for the execution of complex scenarios and provide advanced monitoring options. Commercial-grade security. Shelly Pro 3EM-400 supports mTLS for MQTT, HTTP, and secure outgoing WebSockets. Commercial-grade security enables direct connections to your cloud infrastructure and reduces the costs of deploying complex networks and VPNs.