What is a gapped torodial transformer?
Gapped toroidal transformers usually require that the gap be filled with some type of insulating material to facilitate the winding process. This is an extra expense. Split core current transformers can be assembled directly on a conductor while toroids must be passed over a disconnected end of the conductor. A toroid can be split in two, but a suitable clamping mechanism (difficult and costly) is required. Some printed circuit boards are space critical. Mounting a toroidal transformer flat on the board may take up too much precious board area. Some applications also have restricted height so the toroid cannot be mounted vertically.
