TCR as low as ±5 ppm/°C, thermal EMF ≤0.6 μV/°C, initial resistance tolerance ±0.1%, and uncompensated current-sensing accuracy of ±0.3%
Shenzhen, China – April 20, 2026
As electric vehicles and energy storage systems continue to demand higher accuracy in high-current measurement, C&B | RESI recently introduced its next-generation high-precision shunt current-sensing modules—the SRES and HRES series. Designed for high power density applications, the new product lineup covers rated currents from 400A to 1200A, targeting use cases in Electric Vehicles (EVs), energy storage systems, and industrial power supplies.
Notably, the newly launched series delivers significant performance breakthroughs across three key parameters: temperature coefficient of resistance (TCR), thermal thermoelectric force (EMF), and load life stability:
Ultra-Low TCR
● SRES: ±5 ppm/°C (typical ±2 ppm/°C)
● HRES: ±15 ppm/°C (typical ±10 ppm/°C)
Low Thermal EMF
● Thermal EMF ≤0.6 μV/°C, effectively negligible in most applications
Tight Initial Tolerance
● ±0.1%, performing a twofold improvement over the previous generation
In conventional solutions, high-precision shunt modules typically exhibit a TCR in the range of ±100 to ±200 ppm/°C and thermal EMF between 0.6 and 3 μV/°C. As a result, engineers always have to implement temperature compensation algorithms and perform unit-by-unit calibration during production.
The SRES and HRES series fundamentally changes this situation at the material and structural level, significantly simplifying system design.
With these modules, users can achieve ±0.3% system-level current measurement accuracy without any additional compensation.
Image credit: C&B | RESI
The engineering value benefit customers from:
● Development cycles shortened significantly
● Elimination of production-line calibration costs
● Significantly enhanced system reliability
Key Performance Comparison
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| Parameter | SRES Series | HRES Series | Industry Mainstream |
| TCR (20–125°C) | Max ±5 ppm/°C (typ. ±2 ppm/°C) | Max ±15 ppm/°C (typ. ±10 ppm/°C) | ±100–±200 ppm/°C |
| Thermal EMF | ≤0.6 μV/°C | ≤0.6 μV/°C | 0.6–3 μV/°C |
| Initial Tolerance | ±0.1% manufactured | ±0.1% manufactured | ±0.3% measured |
| System Accuracy | ±0.3% (no TCR compensation required) | ±0.3% (no TCR compensation required) | ±0.5% (requires TCR compensation) |
Operating temperature range (all series): -40°C to +125°C
1. Why Low TCR and EMF Matter?
In high-current precision sensing, the TCR and thermal EMF of high-precision shunt current-sensing modules are the two primary sources of measurement error.
● TCR:
Changes in ambient temperature or self-heating cause resistance drift. In conventional shunt modules, TCR typically ranges from ±100 to ±200 ppm/°C. With a 30°C temperature variation, resistance drift can reach 0.3% to 0.6%.
● Thermal EMF:
Thermal voltage is generated at the junction between manganin alloy and copper terminals under temperature gradients. In conventional products, thermal EMF ranges from 0.6 to 3 μV/°C. In millivolt-level DC sensing signals, this effect cannot be ignored—and in some cases, its impact can exceed that of TCR.
These challenges have long troubled system engineers, often requiring multi-point temperature compensation, production-line calibration, and additional thermal management design. Such measures not only extend development cycles but also increase overall costs.
With the launch of the SRES and HRES series, C&B | RESI has reduced the TCR by more than an order of magnitude and suppressed thermal EMF to near-negligible levels—enabling high-accuracy measurement through direct hardware sampling, without the need for compensation.
2. Product Series Overview
SRES Series: Automotive-Grade High-Precision Shunt Module
The SRES series is designed for applications demanding extreme measurement accuracy. Across the full operating temperature range, resistance remains nearly unchanged, while thermal EMF is tightly controlled at an ultra-low level. Both initial tolerance and load life stability stand at a leading level in the industry.
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HRES Series: Ultra-Low Resistance Module
The HRES series further reduces resistance values to minimize power loss. Key offerings include:
● 25 μΩ (Size 6918)
● 15 μΩ (Size 8436)
With compact packaging, these modules support 600A to 1200A high-current measurement, making them particularly suitable for applications with limited space and high power density requirements
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RESI Next-Generation High-Precision Shunt Module Selection Table
| Part Number | Rated Current | Max TCR (20–125°C) | Thermal EMF | Resistance Range | Initial Tolerance | Measurement Accuracy | Dimensions (mm) |
| SRES6918BL100VST0 | 400A | ±5 ppm/°C | ≤0.6 μV/°C | 100 μΩ ±5% | ±0.1% | ±0.3% | 69 × 18 × 3 |
| HRES6918BL050MST0 | 500A | ±15 ppm/°C | ≤0.6 μV/°C | 50 μΩ ±5% | ±0.1% | ±0.3% | 69 × 18 × 3 |
| HRES6918BL025MST0 | 600A | ±15 ppm/°C | ≤0.6 μV/°C | 25 μΩ ±5% | ±0.1% | ±0.3% | 69 × 18 × 3 |
| SRES8436BL050VST0 | 800A | ±5 ppm/°C | ≤0.6 μV/°C | 50 μΩ ±5% | ±0.1% | ±0.3% | 84 × 36 × 4 |
| HRES8436BL025MST0 | 1000A | ±15 ppm/°C | ≤0.6 μV/°C | 25 μΩ ±5% | ±0.1% | ±0.3% | 84 × 36 × 4 |
| HRES8436BL015MST0 | 1200A | ±15 ppm/°C | ≤0.6 μV/°C | 15 μΩ ±5% | ±0.1% | ±0.3% | 84 × 36 × 4 |
3. Applications
The SRES and HRES series are suitable for a wide range of high-current, high-precision applications, including:
● Electric Vehicles (EVs) main drive systems
● Construction machinery
● Agricultural machinery
● eVTOL (electric vertical take-off and landing aircraft)
● Energy storage systems
● DC charging piles
● High-precision power metering
● Precision power supplies
Selection can be referenced based on the recommended application mapping below.
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4. Samples and Delivery
Both series have now officially entered the sample delivery. If you are interested in these products, the sample request channel is now officially open. For further information, please visit the RESI online store (https://www.resistor.today/) or platforms such as SZLCSC.COM to inquire and apply.
5. Outlook: AMC Series Isolated Smart Shunt
Built on a newly developed technology platform, RESI has also previewed two upcoming isolated current sensor products: AMC0500 (±500A) and AMC1000 (±1000A). Compared with the previous-generation CB series, the new models are expected to deliver significantly improved performance while also offering cost advantages.
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| Series | Rated Current | Tolerance | Zero Drift | Overload Current | Operating Temperature | Isolation Rating | Communication |
| AMC0500 | ±500A | ±0.1% | 30 mA | ±8,000A @ 50 ms | -40 to +105°C | 3,000 VAC | CAN 2.0 |
| AMC1000 | ±1000A | ±0.1% | 30 mA | ±20,000A @ 50 ms | -40 to +105°C | 5,000 VAC | CAN 2.0 |
Both products are scheduled to start of production in Q3, 2026.
6. About RESI
C&B | RESI specializes in high-precision current sensing technologies, with integrated full chain in-house capabilities from materials to module, continuously providing high-accuracy and high-reliability sensing solutions for new energy and industrial applications.
