Miniature 1-phase open-core transformer TOM-400

The conductor with the measured current passes through the main bore of the transformer (P1/P2).This is equivalent to one winding 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 the two windings is a constant quantity.
This is the current ratio IPn/ISn=N, where
IPn - rated primary current;
ISn - rated secondary current;
N - gear ratio value.
From the value of the current flowing through the secondary winding, the value of the current flowing through the primary winding can be determined:
ISm*N=IPm, where
ISm - measured primary current;
IPm - measured secondary current.


NOTE
Recommended connection of the secondary system with a wire of not less than 2.5 mm² in diameter.
Recommended earthing of terminal S2.
It is forbidden to disconnect the secondary circuit during the operation of the transformer (possibility of high voltage resulting in shock to persons or damage to the equipment).