VDO Marine Ammeter Shunt -150/150AMP - 60mV Input - 12/24V - A2C59514047VDO Marine Ammeter Shunt 150 150AMP 60mV Input 12 24V A2C59514047 Ammeter Shunt 150 150AMP 60mV Input 12 24V A shunt is a resistor that causes a small voltage drop. This voltage drop in mVolt is proportional with the current in ampere that goes through the resistor. This voltage is measured by the Ammeter. The advantage of the shunt is that thick wires are no longer needed at a high current (>10 A). To measure the total flow you only need two thin