There's a picture in
this post.
No part #, because it's cannibalized from a GFCI outlet, available everywhere.
The wire that passes through the current-sensing transformer is inside the box, between the plug and socket for the stove.
Plug the plug into the outlet the stove is currently plugged into.
Plug the stove into the switch box.
Here's a picture of another type of current transformer found inside a GFCI outlet:

The power line (in the schematic the line between the plug and the socket that goes to the stove) is the thick conductor through the center (there are two here, but you could just discard the other one for this type; you only need 1 conductor going through to form the primary side of the transformer).
The coil of fine wire is the secondary, as shown in the schematic.
Does that make sense to you?