Shunts

A shunt is a precision resistor connected in parallel across a device which is used to measure both alternating and direct current by creating a low-resistance path. Learn more with our handy shunt resistors guide.

How does a shunt work?
Also known as an ammeter shunt or a current shunt resistor, a shunts low resistance creates only a small amount of voltage drop by using little energy in the process. By using Ohms Law equation, the voltage across the shunt is measured and used to calculate the current flow in amperes.
A resistor of accurately known resistance (usually a manganin resistor) is placed in parallel with the ammeter. The current is then divided so that only a small amount travels through the ammeter and the actual amperage can be directly measured.

Shunts applications
Shunts are diverse and capable of many uses within many different applications:
  • One of the uses of a shunt is within a renewable energy system such as wind turbines or solar panels. They are used to measure how much current is flowing in and out of the battery, or for knowing how much power is being generated.
  • If high frequency noise is an issue, a shunt with a capacitor
    can be used to redirect noise sending it to the ground before the signal reaches the circuit elements.
  • They can be installed within a DC disconnect enclosure with a negative conductor between the batteries and the inverter. Some systems also have multiple shunts when several inputs and outputs require monitoring.
  • Shunts can be used for overload protection in control devices such as battery chargers and power supplies. They can also be used in digital meters and coil panel meters for measuring current in DC.


Types of shunts
There are several different types of shunts such as, standard brass ended, compact brass ended, digital, plate type and wire type.

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Description Price Maximum Current Voltage Output Shunt Type Accuracy Minimum Temperature Maximum Temperature For Use With Series
New
RS Stock No. 212-0192
Mfr. Part No.GV7AS207
£82.39
Each
Units
- - - - - - - TeSys
New
RS Stock No. 205-9745
Mfr. Part No.CSM2F-6918-L050J01
BrandBourns
£9.20
Each (In a Pack of 50)
Units
849 A 42.4mV Plate 5 % - - - -
New
RS Stock No. 205-9743
Mfr. Part No.CSM2F-7036-L050J01
BrandBourns
£15.60
Each (In a Pack of 50)
Units
1 kA 50mV Plate 5 % - - - -
New
RS Stock No. 205-9746
Mfr. Part No.CSM2F-6918-L050J01
BrandBourns
£8.63
Each
Units
849 A 42.4mV Plate 5 % - - - -
New
RS Stock No. 205-9741
Mfr. Part No.CSM2F-8518-L100J01
BrandBourns
£9.64
Each (In a Pack of 50)
Units
600 A 60mV Plate 5 % - - - -
New
RS Stock No. 205-9738
Mfr. Part No.CSM2F-8518-L050J01
BrandBourns
£8.901
Each (In a Pack of 50)
Units
849 A 42.4mV Plate 5 % - - - -
New
RS Stock No. 205-9744
Mfr. Part No.CSM2F-7036-L050J01
BrandBourns
£15.68
Each
Units
1 kA 50mV Plate 5 % - - - -
New
RS Stock No. 205-9742
Mfr. Part No.CSM2F-8518-L100J01
BrandBourns
£13.88
Each
Units
600 A 60mV Plate 5 % - - - -
New
RS Stock No. 205-9740
Mfr. Part No.CSM2F-8518-L050J01
BrandBourns
£9.83
Each
Units
849 A 42.4mV Plate 5 % - - - -
RS Stock No. 2508935437
Mfr. Part No.06715
BrandSimpson
£70.20
Each
Units
- - - - - - - -
RS Stock No. 2508935386
Mfr. Part No.06717
BrandSimpson
£77.09
Each
Units
- - - - - - - -
RS Stock No. 2508935415
Mfr. Part No.06709
BrandSimpson
£70.20
Each
Units
- - - - - - - -