Yes, the Shelly Pro 3EM-120A supports both 50A and 3×63A CT clamps.
However, unlike the Pro 3EM-120A, the Shelly Pro 3EM-63CT does not support alternative CT clamp types. It only supports 3x63A CT clamps.
Important: When installing or replacing CT clamps, make sure to select the correct CT clamp type in the device settings to ensure accurate measurements.