Maximum Precision for High-Current Applications: The New SRES and HRES Shunt-Based Current Sensing Modules from Resi

Accurate current sensing under complex operating conditions often poses a significant challenge for developers. With the new SRES and HRES series, Resi introduces an innovative solution that combines high-end performance with ease of implementation.

In modern power electronics—ranging from electromobility to industrial energy storage—the accuracy of current measurement is crucial for system stability. Traditional current sensing using shunts often reaches its limits when temperature fluctuations and thermal voltages distort the results. This is where the new shunt-based modules from Resi’s SRES and HRES series come into play.

Technological Superiority Without Compensation Overhead

The standout feature of the SRES and HRES series is their thermal stability. While conventional high-precision solutions often require complex algorithms for temperature compensation, these modules achieve an extremely low Temperature Coefficient of Resistance (TCR) of as little as 2 ppm/°C. Even across a wide range of +20°C to +125°C, a TCR of 5 ppm/°C remains stable—a performance level that previously required complex external circuitry.

Furthermore, thermal EMF (electromotive force), a critical factor in measurement error, has been drastically optimized: reduced from the typical 3 μV/°C in standard designs to just 0.6 μV/°C. This significantly minimizes measurement errors caused by temperature gradients within the component.

Intelligent Integration: On-board NTC Thermistor

Resi has successfully integrated a high-performance NTC thermistor directly into the module without changing the conventional shunt size or mounting conditions. This allows for precise monitoring of the component temperature directly at the source. The data obtained supports even higher precision current measurement and enhances the overall reliability of the system.

Key Features at a Glance:

Measurement Range: Designed for rated currents from -1200A to +1200A.
Maximum Accuracy: ±0.3% current sensing accuracy achievable without algorithmic compensation.
Stability: Temperature coefficient as low as 2 ppm/°C; Thermal EMF as low as 0.6 μV/°C.
Robustness: Operating temperature range from -40°C to +125°C.
Durability: Excellent long-term reliability for critical applications.

Conclusion for Developers

With the SRES and HRES series, Resi provides a solution that not only improves the accuracy and reliability of high-current sensing but also simplifies system design. By eliminating the need for complex compensation algorithms, developers save valuable time and reduce the susceptibility of their circuits to errors.

Are you interested in using the SRES or HRES series in your next project? Our experts at Wittig Electronic are happy to assist you in selecting the right components for your specific requirements.