3000A 75mV Shunt Resistor (High Current DC Measurement)
A 3000A 75mV shunt resistor is a common solution for industrial DC current measurement in rectifiers, converters, battery systems and high-power DC distribution. Below you’ll find the calculated resistance, power dissipation, wiring notes and RFQ guidance.
Key electrical values (3000A / 75mV)
| Nominal current | 3000 A |
|---|---|
| Voltage drop | 75 mV (0.075 V) |
| Resistance | 0.025000 mΩ (0.000025000 Ω) |
| Power dissipation (continuous) | 225 W |
Formulas: R = V/I, P = I²·R. For duty cycle / overload, thermal design must be verified.
Typical use cases
- High-power DC rectifiers and converters
- Battery racks / BESS current monitoring
- Industrial DC distribution and busbar measurement
- Electroplating and high current process control
Engineering design notes
Thermal considerations
- 225 W is significant dissipation: mounting and airflow matter.
- Consider busbar integration to spread heat and reduce hotspot temperature.
- Define duty cycle and overload profile (peak current duration and repetition).
Accuracy & wiring
- Use Kelvin (4-wire) sensing to avoid terminal/contact resistance errors.
- Route sense wires as twisted pair, away from high dI/dt power conductors.
- Define accuracy class, TCR and stability requirements.
Common specifications to define in your RFQ
- Continuous current and overload profile
- Voltage drop (75mV) and tolerance (e.g. class 0.5 / 0.2)
- Ambient temperature and airflow
- Mechanical constraints: hole spacing, busbar thickness, footprint
- Quantity/year and lead time targets
Request a quotation
Send your mounting constraints and duty cycle. Our engineering team will recommend the best configuration for a stable 3000A / 75mV measurement.
FAQ
What is the resistance of a 3000A 75mV shunt?
Resistance is R = V / I = 0.075 / 3000 = 0.025000 mΩ.
How much power does a 3000A 75mV shunt dissipate?
Power is P = V · I = 0.075 · 3000 = 225 W (continuous at nominal current).
Do I need Kelvin (4-wire) sensing?
For high current and very low resistance shunts, Kelvin sensing is strongly recommended to reduce errors
from terminals and conductor drops and to improve repeatability.