Description
Overview
Designed for high-accuracy current measurement, this 300A precision electron beam welded shunt resistor with 3 terminals offers exceptional stability and low resistance. Ideal for EV battery packs, BMS, and industrial energy storage systems, it ensures reliable performance under heavy load and harsh conditions. Customizable resistance values and mounting options available
Electrical parameter
| Model | L | D | L1 | A | F | M | C | B1 | B2 |
|---|---|---|---|---|---|---|---|---|---|
| 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 |
Electrical parameter
| Parameter | Specification |
|---|---|
| Rated Current | 300A |
| Accuracy Class | 0.2%, 0.5%, 1%, 2%, 5% |
| T.C.R (ppm/°C) 20℃ ~ 60℃ | ≤50 |
| Manganese Copper Material | National standard 6J12 precision manganese copper |
| Copper Material | National Standard T2 Y2 |
| Operating Temperature | -55℃ ~ +170℃ |
Performance testing
| Project | Test Conditions | Resistance Range |
|---|---|---|
| Thermal Shock | -40℃ to +150℃, 1000 cycles, 15 minutes at each extreme | ±0.5%R |
| Short-term Overload | 2.5 times rated power, lasting 5 seconds | ±0.5%R |
| Low Temperature Operation | -40℃ for 45 seconds | ±0.5%R |
| High Temperature Exposure | At +170℃ for 1000 hours | ±1%R |
| Deviation Humidity | +85℃, 85%RH, 10% deviation, 1000 hours | ±0.5%R |
| Mechanical Shock | 100 ms, 6 ms duration, 5 pulses | ±0.5%R |
| Vibration | Frequency sweep 10Hz–2000Hz in 1 minute, 3 directions, 12 hours | ±1% |
| Load Life | 1000 hours at +70°C, 1.5h “on”, 0.5h “off” cycle | ±0.5% |
| Moisture-proof | MIL-STD-202 | ±0.5% |
✅ Applications
The 300A precision electron beam welded shunt resistor with 3 terminals is ideal for accurate current measurement in high-power systems. It is widely used in:
🔋 EV Battery Packs – For monitoring current flow in electric motorcycles, three-wheelers, and compact EVs.
⚡ Battery Management Systems (BMS) – Ensures precise current sensing and protection in lithium-ion battery systems.
☀️ Energy Storage Systems (ESS) – Supports stable load control and energy monitoring in solar and commercial storage units.
🏭 Industrial Power Equipment – Applied in UPS, inverters, and high-load power modules for current detection.
🚉 Railway and Heavy Equipment – Handles current monitoring in transportation battery systems under demanding conditions.
For more details on technical standards for shunt resistors in BMS and EV systems, refer to the
official IEEE website.
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