DC current-shunt equations
A calibrated shunt converts current into a small measurable voltage while dissipating I²R heat.
Rshunt = Vrated/IratedVactual = IactualRshuntP = I²Rshuntwhere:
- Rshunt
- Calibrated shunt resistance[Ω]
- Vactual
- Shunt output voltage[V]
Kelvin sensing and temperature coefficient govern accuracy.
How to use the Current Shunt Calculator
Size or verify a DC current shunt from rated current and millivolt drop, including resistance, power loss, burden voltage, and meter scaling. Start by choosing the operating mode, then enter values from nameplates, measurements, or project documents in the units shown. The result updates immediately and keeps intermediate quantities visible for review.
- Confirm the system and calculation mode.
- Enter measured or manufacturer-rated values.
- Review the primary result and intermediate metrics.
- Continue with the related protection or equipment-selection checks.
Calculation method and validation
The equations and symbol definitions above show the complete calculation basis. Inputs are checked before calculation so zero, negative, incompatible, or physically impossible combinations are flagged instead of silently producing a misleading result.
How to interpret the result
Use the main result as a starting value and read every supporting metric. DC shunt with linear calibrated resistance Kelvin sense connections Meter input loading is negligible A passing or recommended result means the entered mathematical conditions are satisfied; it does not certify the complete installation or a particular product combination.
- DC shunt with linear calibrated resistance
- Kelvin sense connections
- Meter input loading is negligible
Selection limits and next checks
Preliminary engineering estimate only. Verify the final design against the current applicable standard, local rules, manufacturer data, and project conditions. Shunts can run hot and remain at hazardous circuit potential. Use manufacturer accuracy class, temperature coefficient, overload, installation and isolation data. Compare the output with the current applicable standard, local rules, exact VIOX product datasheet, environmental conditions, protection coordination, and the engineer's project requirements before procurement or installation.
Continue with terminal heating calculatorContinue with ohms law calculatorContinue with battery c rate runtime calculator
Assumptions
- DC shunt with linear calibrated resistance
- Kelvin sense connections
- Meter input loading is negligible
Important Warnings
- Preliminary engineering estimate only. Verify the final design against the current applicable standard, local rules, manufacturer data, and project conditions.
- Shunts can run hot and remain at hazardous circuit potential.
- Use manufacturer accuracy class, temperature coefficient, overload, installation and isolation data.