Manganin Alloy Bolt-On Shunt Resistor for DC Current Measurement
Description
Overview
High Current Bolt-On Shunt Resistor for Precision DC Current Sensing
This bolt-on shunt resistor is designed for high-current DC measurement applications where accuracy, stability, and long-term reliability are critical. It provides a precise millivolt output by creating a controlled voltage drop across a low resistance element, enabling accurate current monitoring in battery systems, power supplies, and industrial equipment.
Our high current shunt resistor features a precision manganin alloy (manganese copper) sensing element combined with high-conductivity copper terminals, delivering excellent thermal stability, low resistance drift, and consistent performance under continuous current loads.
The 50 μΩ bolt-on shunt resistor with two sense pins is optimized for precision current sensing applications requiring low TCR, minimal thermal EMF, and reliable signal measurement. The secure bolt-on mounting structure ensures strong mechanical connection and efficient heat dissipation, making it suitable for battery management systems (BMS), energy storage systems, DC power supplies, and industrial control applications.
Key Features of Bolt-On Shunt Resistor
Precision Low Resistance Design
- Available in ultra-low resistance values for high-current measurement
- 50μΩ shunt resistor design minimizes voltage loss and power consumption
- Supports accurate current sensing in demanding DC applications
Manganin Alloy Sensing Element
- High-quality manganese copper alloy provides excellent resistance stability
- Low temperature coefficient (TCR ≤ ±50 ppm/°C)
- Minimizes measurement errors caused by temperature variation
Robust Bolt-On Structure
- Solid metal construction with welded assembly
- Secure mechanical mounting for high-current applications
- Improved heat transfer and long-term reliability
Electrical Performance
- Very low inductance (<5 nH) for fast switching applications
- Low thermal EMF (<3 μV/°C)
- Suitable for precision current measurement systems
Common Challenges in High Current Measurement
Resistance Drift at High Temperature
High current operation generates heat, which may cause resistance variation and inaccurate current measurement.
Poor Connection Reliability
Traditional wire-based shunts may experience loose connections or increased contact resistance.
Limited Measurement Accuracy
Incorrect resistor selection can lead to voltage measurement errors in BMS and power systems.
Space and Thermal Management Issues
High-power applications require compact structures with efficient heat dissipation
How Our Bolt-On Shunt Resistor Solves These Challenges
Secure Bolt-On Installation
The screw-mounted structure provides reliable electrical connection and mechanical stability.
Stable Manganin Resistance Element
The manganin alloy design ensures low TCR and consistent resistance performance.
High Current Capability
Designed for continuous current operation while maintaining accurate voltage output.
Long-Term Industrial Reliability
Suitable for demanding applications including battery systems, energy storage, and industrial equipment.
Specification
| Parameter | Value |
|---|---|
| Resistance Value | 50 μΩ |
| TCR (Temperature Coefficient) | ≤ ±50 ppm/°C |
| Accuracy Class | ±0.5% |
| Maximum Current Rating | Depends on model (e.g., 100A) |
| Operating Temperature Range | -40°C to +125°C |
| Material | Manganin Alloy |
| Mounting Style | Bolt-on Terminals |
| Sense Pins | Two (Kelvin connection) |
| Dimensions (L×W×H) | customize |
| Power Rating | 50W |
Product Size
| Model | L (mm) | D (mm) | A (mm) | B (mm) | F (mm) | M |
|---|---|---|---|---|---|---|
| FL3-6918-A-100μΩ | 69±0.5 | 18±0.5 | 52±0.5 | 18±0.5 | 3±0.2 | φ7.0×2 M4×2 |
| Model | L (mm) | D (mm) | L1 (mm) | A (mm) | F (mm) | M | C | B1 (mm) | B2 (mm) |
|---|---|---|---|---|---|---|---|---|---|
| FL3-6918-B-50μΩ | 69±0.5 | 18±0.5 | 52±0.5 | 7±0.5 | 3.0±0.5 | φ7.0×2 | 1×1 | 4±0.1 | 6±0.15 |
Manganin Alloy Material for Precision Shunt Measurement
Manganin alloy is widely used in precision shunt resistors due to its low temperature coefficient, stable resistance characteristics, and excellent long-term reliability. Combined with copper terminals, it provides both accurate sensing performance and efficient current conduction.
Electrical performance:
| Parameter | Value |
|---|---|
| Rated Current | 300A |
| Accuracy Class | 0.2%、0.5%、1%、2%、5% |
| T.C.R (ppm/℃ at 20℃~60℃) | ≤50 |
| Manganese Copper Material | GB 6J12 precision manganese copper |
| Copper Material | GB T2 Y2 |
| Operating Temperature Range | -55℃ ~ +170℃ |
For more technical background on current shunt measurement principles, you may refer to
Shunt resistor principle in electrical engineering：https://en.wikipedia.org/wiki/Shunt_(electrical)
Operating Conditions
- Operating temperature: -40°C to +120°C
- Suitable for high-current DC systems
- Designed for industrial and energy environments
- Resistant to vibration and thermal stress
Why Choose a Bolt-On Shunt Resistor for High-Current Sensing?
Bolt-on Shunt resistors offer superior mechanical strength and electrical stability, making them ideal for applications that require:
-
Secure fastening with screw terminals
-
Low-resistance, low-inductance current paths
-
High thermal conductivity
-
Robust performance under vibration and shock
The dual sense pins guarantee accurate Kelvin measurements, reducing errors caused by lead resistance.
Applications of Bolt-On Shunt Resistor
- Battery Management Systems (BMS)
- Battery Energy Storage Systems (BESS)
- EV charging equipment
- DC power supplies
- Solar energy systems
- Industrial power monitoring
- Smart energy meters
- Motor control systems
Looking for more current sensing and power testing solutions?
Explore our DC ammeter shunt resistor series designed for industrial and energy applications.
Need a Custom Bolt-On Shunt Resistor?
- Custom current range available
- Fast sample support
- Engineering assistance for your application
