Plate Contacts
In the instant electricity makes and breaks, the material decides everything.
Overview
Plate contacts are used in electromagnetic contactors, heavy-duty molded case circuit breakers, earth leakage circuit breakers, no-fuse breakers, ACB and VCB. Available materials include AgCdO, AgSnInOx, Ag-W, Cu-W and Ag-WC grades, and shapes include round, square and other special forms.
Classification by material
Classification by Material
AgCdO Group
AgCdO Group (post-oxidation process)
A contact material in which other elements (MOx) are added to AgCdO, giving excellent erosion resistance, breaking performance and contact resistance even in the high-current range, with stable temperature rise. The chemical composition shown excludes the Ag clad layer at the brazing area. Plate contacts are welded onto a copper, brass or steel shank when mounted; Silver is applied to the weld area of the contact to improve weldability during assembly.
| Grade | Composition (wt%) | Hardness (annealed, Hv) | Melting Point ℃ (solidus) | Electrical Conductivity (%IACS) | Applications |
|---|---|---|---|---|---|
| HE100A | Ag90 MOx10 | 80 | 960 | 80 | Light-load electromagnetic contactors |
| HE141 | Ag85.2 MOx14.8 | 85 | 960 | 60 | Molded case circuit breakers |
| HE151 | Ag83.4 MOx16.6 | 95 | 960 | 55 | Electromagnetic contactors, current limiters |
| HE161 | Ag81.3 MOx18.7 | 100 | 960 | 50 | Heavy-load connectors |
AgSnInOx Group
AgSnO2InOx Group (post-oxidation process)
The chemical composition shown excludes the Ag clad layer at the brazing area. Plate contacts are welded onto a copper, brass or steel shank when mounted; Silver is applied to the weld area of the contact to improve weldability during assembly.
| Grade | Composition (wt%) | Hardness (annealed, Hv) | Melting Point ℃ (solidus) | Electrical Conductivity (%IACS) | Applications |
|---|---|---|---|---|---|
| SJ04 | Ag85.2MOx14.8 | 120 | 960 | 52 | Molded case circuit breakers, electromagnetic contactors |
| SJ06 | Ag90MOx10 | 100 | 960 | 75 |
Ag-W Group
Ag-W Group
It combines the low contact resistance and high conductivity of silver with the hardness, arc resistance and erosion resistance of tungsten. It offers outstanding arc resistance and welding resistance in the high-current range.
| Grade | Composition (wt%) |
Hardness (annealed, Hv) |
Melting Point ℃ (solidus) |
Electrical Conductivity (%IACS) |
Density (g/cm³) |
Thermal Conductivity (Cal/cm·sec·℃) |
Applications |
|---|---|---|---|---|---|---|---|
| S30A2 | Ag30W70 | B:98 | 960 | 51 | 15.3 | – | Air circuit breakers, heavy-duty contactors, EDM electrodes |
| S50A2 | Ag50W50 | B:98 | 960 | 68 | 13.5 | – | |
| S60A2 | Ag60W40 | B:98 | 960 | 72 | 12.8 | – |
Cu-W Group
Cu-W Group
Erosion is extremely low, giving good welding resistance and arc resistance. Its properties are similar to the Ag-W series, but contact resistance and re-oxidation behavior are somewhat inferior, and it is used in oil-immersed applications.
| Grade | Composition (wt%) |
Hardness (annealed, Hv) |
Melting Point ℃ (solidus) |
Electrical Conductivity (%IACS) |
Density (g/cm³) |
Thermal Conductivity (Cal/cm·sec·℃) |
Applications |
|---|---|---|---|---|---|---|---|
| C20A2 | Cu20W80 | B:103 | 1083 | 40 | 15.6 | – | Heavy-duty oil circuit breakers, transformer tap contacts, EDM electrodes, extra-high-voltage gas circuit breakers |
| C30A2 | Cu30W70 | B:93 | 1083 | 48 | 14.2 | – | |
| C40A2 | Cu40W60 | B:88 | 1083 | 53 | 13.1 | – |
Ag-WC Group
Ag-WC Group
A sintered contact material combining highly oxidation-resistant, high-hardness WC with high-conductivity silver. Its contact resistance changes little and its welding resistance is excellent, so it withstands overload well and performs strongly in low-voltage, high-current applications.
| Grade | Composition (wt%) |
Hardness (annealed, Hv) |
Melting Point ℃ (solidus) |
Electrical Conductivity (%IACS) |
Density (g/cm³) |
Thermal Conductivity (Cal/cm·sec·℃) |
Applications |
|---|---|---|---|---|---|---|---|
| HS-02X | Ag35WC+α65 | 280 | 960 | 30 | 13.5 | – | Molded case circuit breakers, heavy-duty air circuit breakers, heavy-load contacts for vehicles of all kinds, heavy-duty contactors |
| HS-01 | Ag40WC+α60 | 270 | 960 | 35 | 12.8 | – | |
| HS-2 | Ag60WC40 | 140 | 960 | 60 | 12.0 | – | |
| HS-1 | Ag50WC50 | 155 | 966 | 45 | 12.3 | – | |
| HD-85 | Ag85WC+α15 | 45 | 960 | 55 | 9.4 | – |
Where They Are Used
Where Plate Contacts Are Used
Used in electromagnetic contactors, heavy-duty molded case circuit breakers, earth leakage circuit breakers, no-fuse breakers, ACB and VCB.
High-voltage vacuum contactor (HVC)
Vacuum circuit breaker (VCB)
Magnetic contactor (MC)
Magnetic contactor (MC)
Gas circuit breaker (GCB)
Residual current circuit breaker (RCCB)
