This Shelly 50A current transformer is an accessory to Shelly EM Gen3 single phase energy meter.
Shelly EM Gen3 product includes 1 piece of current transformer, you can buy this clamp separately and use it for the measurement of a second circuit.
Internal diameter: 11mm
Accuracy: 1%
Rated primary Current: 50A
Rated secondary current: 16.67mA