Limit Deviations of External Dimensions for Flat, Curved and Spherical Flake Powder Contacts (Unit: mm)
| External dimensions including length, width and outer diameter | thickness(T) | ||||
| Nominal size | Tolerance | Nominal size | Tolerance | ||
| Rolled & Extruded Alloy Electrical Contacts | Powder compacted alloy electrical contacts | Infiltrated alloy electrical contacts | |||
| ≤3 | +0.04 | 0.4～1.0 | -0.06 | -0.12 | -0.15 |
| -0.10 | |||||
| 3～6 | +0.06 | 1.0～1.5 | -0.10 | -0.15 | -0.20 |
| -0.12 | |||||
| 6～10 | +0.08 | 1.5～2.0 | -0.12 | -0.20 | -0.25 |
| -0.15 | |||||
| 10～18 | +0.10 | 2.0～3.0 | -0.15 | -0.25 | -0.30 |
| -0.17 | |||||
| 18～30 | +0.12 | ＞3.0 | -0.20 | -0.30 | -0.35 |
| -0.21 | |||||
| 30～50 | +0.14 | ||||
| -0.25 | |||||
| 50～80 | +0.16 | ||||
| -0.30 | |||||
Note: The thickness limit deviation for flat, curved and spherical powder contacts: For thickness greater than 1 mm, infiltration alloy electrical contacts shall comply with IT15, while others shall comply with IT14 (see GB/T 1800.1-2009), or alternatively as specified in Table 1; for thickness less than or equal to 1 mm, the provisions in Table 1 shall apply.
Silver-graphite
| Identification | Feature | Main Application Field |
| AgC | AgC is an environmentally friendly material, it is made by the method of extrusion and slice, C which is in the material of AgC distributes as avant garde perpendicular to working face and parallel with the current direction. The unique technique of decarbonization makes the contact welding face form into a layer of silver which can be used for welding. Because of the brittleness of C layer, it makes AgC becomes the best material of the resistance of melting and welding in all contact materials. In addition, the contact resistance of AgC is lower. | Circuit breaker |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgC(3) | Extrusion process | 96～98 | ≥9.10 | ≤2.20 | ≥40 |
| AgC(4) | 95～97 | ≥8.80 | ≤2.30 | ≥40 | |
| AgC(5) | 94～96 | ≥8.60 | ≤2.50 | ≥40 | |
| AgC(7) | 92～94 | ≥7.95 | ≤2.80 | ≥40 | |
| AgC(3) | Powder compaction process | 96～98 | ≥9.10 | ≤2.40 | ≥40 |
| AgC(5) | 94～96 | ≥8.60 | ≤3.20 | ≥40 |
 |  | |
| AgC(4) 200X transverse | AgC(4) 200X longitudinal |
Silver-tungsten Contact
| Identification | Feature | Main Application Field |
| AgW | Silver-tungsten contact material not only has good electrical conductivity and easily processed, but also has a high melting point, high hardness, better corrosion resistant of arc, better resistance of melting and welding, and transfers less and so on. Its greatest feature is having a strong bearing capacity for the arc of large current. | Circuit breaker |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgW(40) | Infiltration process | 58.5～61.5 | ≥12.40 | ≤2.60 | ≥90 |
| AgW(50) | 48～52 | ≥13.15 | ≤3.00 | ≥110 | |
| AgW(55) | 43～47 | ≥13.55 | ≤3.20 | ≥120 | |
| AgW(60) | 38～42 | ≥14.00 | ≤3.40 | ≥130 | |
| AgW(65) | 33～37 | ≥14.50 | ≤3.60 | ≥140 | |
| AgW(70) | 28～32 | ≥14.90 | ≤3.80 | ≥155 | |
| AgW(80) | 18～22 | ≥16.10 | ≤4.60 | ≥185 |
AgW(50) 200X
Silver-tungsten Carbide Contact
| Identification | Feature | Main Application Field |
| AgWC | Silver-tungsten carbide contact material not only has a good electrical conductivity and easily processed, as the same as Ag, but also has a high melting point, high hardness, corrosion-resistant of arc of WC. Its contact resistance is a little higher than AgW, but very stable because at the arc time, the graphitic carbon has reducing action to prepent oxidation. Because the resistance of arc action is good, burning loss is less, the tendency of melting and welding is small, it can be used to match with AgNi. | Circuit breaker |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgWC(40) | Infiltration process | 57～63 | ≥11.60 | ≤3.45 | ≥110 |
| AgWC(45) | 52～58 | ≥11.82 | ≤4.15 | ≥120 | |
| AgWC(50) | 47～53 | ≥12.05 | ≤4.50 | ≥135 | |
| AgWC(60) | 57～63 | ≥12.55 | ≤5.00 | ≥150 |
AgWC(40) 200X
Silver tungsten carbide graphite
| Identification | Feature | Main Application Field |
| AgWCC | Silver tungsten carbide graphite materials combine the excellent electrical conductivity and superior formability of silver, while tungsten carbide endows the composite with a high melting point, high hardness and outstanding resistance to arc erosion. The added graphite delivers distinctive self-lubricating properties. Its overall contact resistance is slightly higher than silver-tungsten materials yet remains stable during long-term service. Free carbon precipitated under arcing can reduce metals and restrain the formation of high-resistance oxide films, significantly mitigating contact erosion and drastically lowering the tendency of welding. | Circuit breaker |
| Identification | Manufacturing technique | Silver content(Wt.%) | Density(g/cm³) | Resistivity(μΩ.cm) | Vickers hardness(HV) |
| AgWC(12)C(3) | Powder compaction process | 84～86 | ≥9.40 | ≤3.40 | ≥46 |
| AgWC(20)C(0.25) | 79～81 | ≥10.65 | ≤2.60 | ≥50 | |
| AgWC(20)C(3) | 76～78 | ≥9.60 | ≤3.55 | ≥50 | |
| AgWC(22)C(3) | 74～76 | ≥9.89 | ≤3.55 | ≥65 | |
| AgWC(26)C(1) | 72～75 | ≥10.15 | ≤3.40 | ≥60 | |
| AgWC(27)C(3) | 68～71 | ≥9.75 | ≤3.70 | ≥65 | |
| AgWC(37)C(3) | 59～61 | ≥10.15 | ≤6.00 | ≥70 |
AgWC(12)C(3) 200X
Silver nickel graphite
| Identification | Feature | Main Application Field |
| AgNiC | Silver nickel graphite materials feature the outstanding electrical conductivity and excellent plastic workability of silver, as well as high strength, arc resistance and anti-metal transfer properties contributed by nickel. Though its contact resistance rises slightly, it maintains stable operation. Free carbon generated under arcing can restore contact surfaces and prevent the formation of insulating oxide layers, effectively reducing contact erosion with a low tendency to welding. | Circuit breaker |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgNi(25)C(2) | Powder compaction process | 72～74 | ≥9.10 | ≤3.50 | ≥50 |
| AgNi(50)C(3) | 46～48 | ≥8.45 | ≤5.50 | ≥60 |
AgNi(30)C(3) 200X
Copper tungsten
| Identification | Feature | Main Application Field |
| CuW | Copper tungsten materials possess the excellent thermal and electrical conductivity as well as good formability of copper, together with ultra-high melting point, high hardness and superior arc erosion resistance offered by tungsten. Its contact resistance is higher than silver-based alloys, yet it performs stably under high-temperature working conditions. Under arcing, copper vaporizes rapidly to form a buffering gas film that protects the substrate. It barely generates high-resistance oxide layers, featuring low contact material loss and low welding tendency, and is widely applied to contacts of high-voltage switches and circuit breakers. | Circuit breaker |
| Identification | Manufacturing technique | Copper content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| CuW(50) | Infiltration process | 48～52 | ≥11.85 | ≤3.20 | ≥115 |
| CuW(55) | 43～47 | ≥12.30 | ≤3.50 | ≥125 | |
| CuW(60) | 38～42 | ≥12.75 | ≤3.70 | ≥140 | |
| CuW(70) | 28～32 | ≥13.80 | ≤4.10 | ≥175 | |
| CuW(75) | 23～27 | ≥14.50 | ≤4.50 | ≥195 | |
| CuW(80) | 18～22 | ≥15.15 | ≤5.00 | ≥220 |
 |  | |
| CuW(70) 200X | CuW(80) 200X |
