Current transformer with an open core TO-200-5

Intended use
The current transformer is used for  proportional change of high current intensity to lower values, adapted to the measuring ranges of control and measuring devices.

Operation
The wire with the measured current passes through the head open of the transformer (P1/P2), which is equivalent to one turn of the primary winding. The terminals of the secondary winding S1 and S2 are connected to the terminals of the measuring circuit of the control or measuring device.
The ratio of the currents in both windings is a constant value and is called the current ratio: IPn/ISn=N, where IPn - rated primary current; ISn - rated secondary current; N - gear value. The value of the current flowing through the secondary winding can be used to determine the value of the current  flowing through the primary winding: ISm*N=IPm, where ISm - measured primary current; IPm - measured secondary current.