Current measuring device protected against electrical surges when opening the circuit

A current measuring device that is protected against electrical surges when opening an electric circuit of said device, said device comprising:

• a first current transformer,
• a first connection terminal having connected thereto a first terminal of said first current transformer,
• a second connection terminal having connected thereto a second terminal of said first current transformer distinct from said first terminal of said first current transformer,
• a protective resistance having a first terminal connected to said second connection terminal,
• a load resistance connected between said first and second connection terminals across terminals of which a voltage is measured from which a current flowing in a circuit passing through said first current transformer is determined,
• a first terminal of a second current transformer connected to a second terminal of said protective resistance and a second terminal of said second current transformer connected to said first terminal of said protective resistance,
• said circuit also passing through said second current transformer, and
• current branch connection means connected between said first connection terminal and said second terminal of said protective resistance.