Description
The Precision Open-Air Low Ohmic Resistor offers reliable and accurate current sensing with resistance values ranging from 0.5mΩ to 100mΩ. Built for open-frame designs, it ensures excellent thermal management and high surge capability. This resistor is perfect for applications such as electric vehicle BMS, inverters, motor control, industrial automation, and HVAC systems. Available in a variety of power ratings and resistance tolerances, our open-air resistors can also be customized to meet your exact specifications.
The bare metal element design allows for maximum cooling via airflow, forcing less heat into the PCB. The flameproof construction offers values down to 2mΩ with low inductance. Customer can specify resistance range designed to satisfy challenging and specific technical requirements.
Key Features:
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Resistance range: 0.5mΩ – 100mΩ
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Power rating: Up to 20W
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Tolerance: ±1%, ±5%
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High thermal dissipation open-frame structure
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RoHS & REACH compliant
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Customization available
Dimension
| Supplier | Material | Wire | Pin Pitch | Resistance | Shape |
|---|---|---|---|---|---|
| Yuansheng | K : Constantan M : Manganese Copper DX : Tinned Copper NT : Copper Nickel NG : Nickel-Chromium MN : 6J16 Alloy MM : 6J06 Alloy |
10 : 1.0mm | 10 : 10mm | 20 : 20mR | U : U Type M : M type M2 : M2 type LX : Type UZ : Type HX : HX |
| Orders are available: 1: Wire diameter of “A”  2: Rated current3: Span of “W”4: Resistance5: Other requirements (board height, foot length, etc.) |
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| Dimensions Reference: A : Wire H : Height H1 : Length E : Pin F : Outer Size W : Pin Pitch |
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Why Choose Our Open Air Low Ohmic Resistors?
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Non-inductive design for high-frequency performance
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Wide operating temperature range for harsh environments
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Press-fit pins for secure PCB mounting and easy soldering
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Compliance with ROHS and REACH
Our resistors combine durability, low resistance, and superior accuracy—making them a trusted solution for engineers worldwide.
Applications of Open Air Low Ohmic Resistor
Open Air Low Ohmic Resistors are used in:
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Power electronics – current sensing in converters, inverters, BMS
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Motor drives & VFDs – for real-time current feedback
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Automotive – battery sensing, regenerative braking, ECU systems
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Industrial automation – servo drives, PLCs, robots
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Power supplies – overcurrent protection in SMPS and UPS
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Renewable energy – solar inverters and energy storage systems
As a metal strip shunt resistor supplier, YuanSheng provides low resistance current sensing solutions using high-performance manganin and constantan alloy materials. Our shunt resistors deliver low inductance, high measurement accuracy, and excellent thermal stability, making them ideal for high-current applications in power electronics, battery systems, energy monitoring, and industrial control equipment.
All products are manufactured with reliable material selection and comply with applicable REACH standards and RoHS requirements.
