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
RS Stock No. 810-3267
Mfr. Part No.3020-01096-0
kr 317,08
Each
Units
50 A 50mV Digital ±0.25 % -40°C +60°C
RS Stock No. 257-385
Mfr. Part No.SHR200MA200
BrandHOBUT
kr 131,22
Each
Units
200 mA 200mV - ±1 % - -
RS Stock No. 823-3576
Mfr. Part No.3020-01102-0
kr 407,54
Each
Units
300 A 50mV Brass-Ended ±0.25 % -40°C 60°C
RS Stock No. 886-2070
Mfr. Part No.YN01-04751BS000000
kr 348,81
Each
Units
10 A 75mV Brass-Ended - - -
RS Stock No. 257-379
Mfr. Part No.SHR20MA200
BrandHOBUT
kr 131,22
Each
Units
20 mA 200mV - ±1 % - -
RS Stock No. 810-3261
Mfr. Part No.3020-01097-0
kr 276,80
Each
Units
5 A 50mV Digital ±0.25 % -40°C +60°C
RS Stock No. 257-565
Mfr. Part No.SHR30A75
BrandHOBUT
kr 172,75
Each
Units
30 A 75mV Plate ±1.5 % - -
RS Stock No. 257-307
Mfr. Part No.SHR10MA75
BrandHOBUT
kr 131,22
Each
Units
10 mA 75mV Plate ±1.5 % - -
RS Stock No. 886-2077
Mfr. Part No.YN01-10751WS000000
kr 514,44
Each
Units
40 A 75mV Brass-Ended - - -
RS Stock No. 257-363
Mfr. Part No.SHR10A75
BrandHOBUT
kr 166,33
Each
Units
10 A 75mV Plate ±1.5 % - -
RS Stock No. 313-902
Mfr. Part No.SHB10A60
BrandHOBUT
kr 403,87
Each
Units
10 A 60mV Brass-Ended ±1 % -20°C +40°C
RS Stock No. 823-3570
Mfr. Part No.3020-01103-0
kr 421,81
Each
Units
500 A 50mV Brass-Ended ±0.25 % -40°C 60°C
RS Stock No. 886-2086
Mfr. Part No.YN01-12751WS000000
kr 540,20
Each
Units
60 A 75mV Brass-Ended - - -
RS Stock No. 823-3589
Mfr. Part No.3020-01108-0
kr 331,93
Each
Units
100 A 100mV Brass-Ended ±0.25 % -40°C 60°C
RS Stock No. 886-2073
Mfr. Part No.YN01-07751BS000000
kr 359,05
Each
Units
25 A 75mV Brass-Ended - - -
RS Stock No. 257-357
Mfr. Part No.SHR3A75
BrandHOBUT
kr 131,22
Each
Units
3 A 75mV Plate ±1.5 % - -
RS Stock No. 501-310
Mfr. Part No.34330A
kr 1 674,20
Each
Units
30 A - - - - -
RS Stock No. 221-0272
Mfr. Part No.192S2114
BrandSocomec
kr 542,71
Each
Units
25 A 100mV Plate - - -
RS Stock No. 205-9744
Mfr. Part No.CSM2F-7036-L050J01
BrandBourns
kr 265,26
Each
Units
1 kA 50mV Plate 5 % - -
RS Stock No. 392-8399
Mfr. Part No.1700V3280
kr 332,72
Each
Units
100 A 60mV Plate ±0.5 % - -