The shunt regulator operates by maintaining a constant voltage across its terminals and it takes up the surplus current to maintain the voltage across the load.

The ammeter shunt is the device that provides the low resistance path to the flow of current. It connects in parallel with the ammeter. In some of the ammeters, the shunt is built inside the instrument while in others it is externally connected to the circuit.

Features:

    Size: 48mm x 29mm x 26mm.
    Display color: Red & Blue LED (dual display).
    Display: 0.28" LED digital.
    Operating voltage: DC 4.5 ~ 30V.
    Measure voltage: DC 0 ~ 100V.
    Minimum resolution (V): 0.1V.
    Refresh rate: ≥500ms / times.
    Measure accuracy: 1% (± 1 digit).
    Minimum resolution (A): 0.01A.
    Operating Current: <20mA.
    Measure current: 50A (shunt measurement).
    Operating temperature: -10 to 65°c.
    Operating Humidity: 10 to 80% (non-condensing).
    Mounting cutout: 45.5mm x 26.5mm.

Features for Shunt resistor 50A 75mV FL-2 : 

Voltage Drop: 75MV.
Used for a DC 50A current Amp meter.
Easy to install.
Accuracy: Class 0.

Specifications for Shunt resistor 50A 75mV FL-2: 

Color: Black
Material: Steel, cupro-manganese, plastic
Dimension (L x W x H): Approx. 4 1/2 x 1 x 3/4 inch (12 x 2.5 x 1.8cm)