Shunt
Revalco
The purpose of the shunt is to permit the passage of the current which exceeds the capacity of the instrument. The latter will therefore be supplied only with a
current which corresponds to its capacity, thus avoiding the risk of damaging the measuring equipment.
The shunts are resistances of very little value and for this reason they are at times formed by conductors with a bar of limited length and substantial rectangular
section. For heat dissipation several bars in parallel are used, terminating in two clamps with a large contact surface.
Alongside the two current clamps there are a further two clamps which serve to connect the ammeter.These clamps have lesser section as the current necessary
for the instrument is much lower than that of the shunt.
Infact, it is not so much a question of the shunt being parallel with the instrument as the instrument deriving from the clamps of the shunt, of which it utilizes
the drop in voltage, withdrawing a part of the current of the circuit, proportionate with the total current.
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