ZCIx4xx minimum current control relay with built-in toroid: 5, 10 and 20 A ranges, block or enable control input.
Does it need a current transformer?
No. The toroid is built in: just pass one phase through the hole on the side.
How is the reference read?
ZCI + control input (V none, B block, P enable) + function (4: minimum) + range (05, 10 or 20 A). For example, ZCIB410: with block, 0 to 10 A.
Which supply does it use?
230 VAC or 24 VAC/VDC. It must be stated in the order.
The wiring diagram can be enlarged in the images below the photo.