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Ohmalloy Material Co.,Ltd

  • China,Shanghai ,Shanghai
  • Verified Supplier
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China CuNi20 Sheet (UNS C71000) for LV Circuit Breakers Shunt Resistor Grade
China CuNi20 Sheet (UNS C71000) for LV Circuit Breakers Shunt Resistor Grade

  1. China CuNi20 Sheet (UNS C71000) for LV Circuit Breakers Shunt Resistor Grade

CuNi20 Sheet (UNS C71000) for LV Circuit Breakers Shunt Resistor Grade

  1. MOQ: 1kg
  2. Price:
  3. Get Latest Price
Supply Ability USD 29-USD39/KGS
Delivery Time within 7 days after payment
Packaging Details spool or be customized by the clients' demand.
Application Industry
Material C71000
Shape foil
Chemical composition Cu,Ni
Resistance (μω.m) 0.49
Ni (min) 44%
Color Bright Silver
Dimensions 0.08*0.8mm
Brand Name Ohmalloy
Model Number constantan
Certification ISO CE
Place of Origin China

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  1. Product Details
  2. Company Details

Product Specification

Supply Ability USD 29-USD39/KGS Delivery Time within 7 days after payment
Packaging Details spool or be customized by the clients' demand. Application Industry
Material C71000 Shape foil
Chemical composition Cu,Ni Resistance (μω.m) 0.49
Ni (min) 44% Color Bright Silver
Dimensions 0.08*0.8mm Brand Name Ohmalloy
Model Number constantan Certification ISO CE
Place of Origin China
High Light CuNi20 sheet for circuit breakersUNS C71000 shunt resistor alloycopper nickel alloy sheet

CuNi20 Sheet (UNS C71000) for LV Circuit Breakers Shunt Resistor Grade

 

CuNi20 Sheet (UNS C71000) for Low-Voltage Circuit Breakers | ±30ppm TCR | 100kA Interrupt | IEC 60947/ASTM B122 Applications: Molded Case Breakers • EV Charging Contacts • Shunt Resistors • Busbar Terminals

MATERIAL TECHNOLOGY

Alloy Composition (ASTM B122):

  • Cu 79-81% | Ni 18-20% | Fe 0.5-1.0% | Mn 0.3-0.8%
  • Density: 8.94 g/cm³ | Melting Range: 1100-1150°C Critical Properties:
  • Resistivity: 34 μΩ·cm at 20°C
  • TCR: ±30 ppm/°C (0-150°C)
  • Thermal Conductivity: 29 W/m·K
  • Sulfide Resistance: Zero tarnishing at 150°C/1000hr

CERTIFIED PERFORMANCE

ELECTRICAL RELIABILITY

  • Contact Resistance: <15 μΩ·cm² (IEC 60413)
  • Arc Erosion Rate: 0.08 mm/1,000 ops at 1kV/10kA (IEC 60947)
  • Resistance Stability: ΔR/R <0.05% after 50,000 interruptions

MECHANICAL DURABILITY

  • Hardness: 110-140 HV (Hard Temper)
  • Fatigue Strength: 180 MPa at 10^(7) cycles (ISO 1099)
  • Thermal Shock: -40°C↔150°C × 500 cycles

DIMENSIONAL SPECIFICATIONS

Standard Sheet (ISO 9444):

  • Thickness: 0.5–12.0 mm (±0. %)
  • Width: 100–600 mm (±0.1 mm)
  • Length: 500–2500 mm (±1 mm/m) Surface Treatments:
  • Mill Finish (Ra 1.6 μm)
  • Passivated (Cr^(3+) oxide layer)
  • Tin/Silver Plated (IEC 60413 compliant)

BREAKER-SPECIFIC ENGINEERING

Contact Performance:

  • Welding Resistance: ≥800 N/mm² (UL 489)
  • Arc Mobility: 20% faster than pure copper
  • Current Density: 100 A/mm² continuous Shunt Resistor Capability:
  • Voltage Drop: 3.4 mV/A·m
  • Thermal Derating: 0.4%/°C above 100°C
  • Self-Inductance: <5 nH/cm

INDUSTRIAL VALIDATION

ELECTRIC VEHICLES:

  • DC Fast Charger Breakers: 1,500V/20kA clearance
  • 0% contact welding at -40°C cold switching INDUSTRIAL AUTOMATION:
  • MCCB Contacts: 100kA interrupt at 440V AC (IEC 60947-2)
  • Short-Circuit Withstand: 100kA/100ms (IEC 60898) RENEWABLE ENERGY:
  • Solar Combiner Boxes: 85% humidity endurance (IEC 61730)
  • Wind Farm Switchgear: 15G vibration resistance

Normal composition%

  Cu Ni+Co Zn Pb P Fe Mn Si Sb S C Mg
B19 Bal. 18.0-20.0 ≤0.3 ≤0.005 0.01 0.5 0.5 0.15 ≤0.005 0.01 0.05 0.05
Typical Mechanical properties

 

Yield strength Tensile Strength Elongation
Mpa Mpa %
160 ≥295 ≥20
 

 

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory
  • Business Type:

    Manufacturer,Distributor/Wholesaler,Exporter,Trading Company

  • Year Established:

    2008

  • Total Annual:

    4000000-6000000

  • Employee Number:

    20~50

  • Ecer Certification:

    Verified Supplier

Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy. Ohmalloy Material Co.,Ltd have a full production line from melting, surface... Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy. Ohmalloy Material Co.,Ltd have a full production line from melting, surface...

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Get in touch with us

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  • Ohmalloy Material Co.,Ltd
  • Room 311, No.1211, Mudanjiang Road, Baoshan district, Shanghai
  • https://www.fecralalloy.com/

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