Snap joint structure allows direct fixing to the cable with nylon ties, simplifying mounting. Fully enclosed housing provides robust mechanical properties and environmental resistance, with strong voltage isolation for safety and reliability. Small and light current transformer with built-in input coil; easy to install and integrate into systems. Easy to use: built-in input coil, compact and lightweight, quick installation. When fixing an energy meter, you do not need to cut off the power. Use scenarios - Installing or retrofitting an energy meter in facilities where downtime must be minimized, since power shutdown is not required. - Mounting in compact electrical panels or tight spaces where a small, lightweight transformer simplifies routing and mounting. - Deploying in environments requiring environmental resistance and reliability, where a fully enclosed design helps protect performance. This description preserves the original features: snap joint fixing, enclosed construction with isolation, built-in input coil, small and lightweight design, and the no-power-cut installation benefit.