Products Description
Manganin copper shunt resistors are precision current sensing components engineered for applications where direct ammeter measurement is impractical or unsafe. These devices provide a reliable method for monitoring high currents that would otherwise damage standard ammeters-whether due to the sheer magnitude of the current or the presence of transient spikes. By offering a known, stable low-resistance path, our Manganin shunts enable accurate current determination through simple voltage drop measurement.
How a Shunt Resistor Works
A shunt resistor operates on a straightforward principle: it creates a bypass path for the majority of the circuit current, allowing only a small, proportional signal to reach the measuring instrument. The voltage drop across the shunt is directly proportional to the current flowing through it, following Ohm's law (I = U/R).
Our Manganin Copper Shunt features a distinct physical configuration that sets it apart from standard resistors. It incorporates two large terminal blocks connected by one or more precision metal strips. This design is not merely cosmetic-it serves a critical functional purpose. The resistance of a metal is inversely proportional to its cross-sectional area; therefore, the number of strips directly determines the shunt's resistance value. More strips result in lower resistance, enabling the device to handle higher currents with minimal power dissipation.
Why Manganin?
The resistive element in our shunts is crafted from Manganin-a specialized copper-manganese-nickel alloy (typically composed of approximately 84% copper, 12% manganese, and 4% nickel). This material is the industry standard for precision shunt resistors due to several outstanding characteristics:
Exceptionally Low Temperature Coefficient of Resistance (TCR)
Manganin maintains a remarkably stable resistance across a wide temperature range, typically ±15 ppm/°C. This ensures measurement accuracy remains consistent regardless of ambient temperature fluctuations.
Superior Long-Term Stability
Manganin resistors demonstrate excellent resistance stability over extended periods, making them ideal for applications requiring reliable, repeatable measurements.
Minimal Thermal EMF
The thermoelectric voltage generated between Manganin and copper is extremely low (typically less than 3 µV/°C), preventing measurement errors caused by temperature gradients at connection points.
Key Features & Benefits
Standard tolerance of ±0.25% ensures accurate millivolt output conversion of primary DC system currents
Available configurations support currents ranging from 15A up to 1,000A and beyond
Available in 50mV, 100mV, or custom output ratings to suit diverse system requirements
Separate terminals for current and voltage sensing eliminate lead resistance errors, ensuring measurement precision
Flat, compact structure minimizes inductance for compatibility with high-frequency applications
Typical Applications
Our Manganin Copper Shunt Resistors are widely deployed across industries including:
Battery Management Systems (BMS)
Power Supplies and Converters
Uninterruptible Power Supplies (UPS)
Motor Control and Drives
Frequency Converters
Solar and Renewable Energy Systems
Electronic Load Equipment
Selection Considerations
When selecting a shunt resistor for your application, consider the following parameters:
Rated Current
The maximum continuous current the shunt can handle
Output Voltage
Typically 50mV or 100mV at rated current
Operating Temperature Range
Standard operation from +30°C to +70°C
Derating
For continuous operation, it is recommended to operate shunts at no more than two-thirds of rated current to ensure longevity
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