Technical Carbon Plant

Electrical contacts

All kinds of contact bodies of the following basic composition materials

  • Silver-cadmium oxide      Silver-copper oxide
  • Silver-nickel                   Silver-wolfram
  • Silver-graphite                Silver tin oxide
  • Silver-zinc oxide
Silver contains contacts bodies ZTV Ltd. produces contacts of pure silver, silvered pseudo-metals and composites. The forms and characteristics of the regular production are shown in draft 4 in the table. Depending on their configuration they are:
  • Cylindrical bodies with flat operating surface / fig.No.1 /
  • Cylindrical bodies with spherical operating surface              / fig.No.2 /
  • Rectangular bodies with flat operating surface / fig.No.3 /
  • rectangular bodies, spherical operating surface / fig.No.4 /
For implementing the contact jet welding of the contacts to the carriers, it is used a contact body with unified shape /fig. 5/, with flat peripheral chamfer and the non-operating surface is wavy.Contact are made by means of technological layer for welding with flat or indented surface. ZTV produces contact and junctions with other shapes and compositions on documentation or sample. Contact bodies of silver-cadmium oxide find their application in contactors, magnetic starters, andrelays at medium and heavy operating mode. Contact bodies of silver-tin dioxide and silver-zinc oxide are free from cancerous substances, and may replace silver-cadmium oxide contact bodies. Contact bodies silver-copper oxide find their application in certain types of contactors. Contact bodies of silver - nickel find a wide application in contactors, magnetic starters and relays. Automatic breakers use a pair with silver - graphite. Contact bodies of silver - graphite are used in asymmetrical pairs with silver-nickel for singlepole automatic breakers, and for powerful breakers - with silver-tungsten. Contact bodies silver-tungsten / 40-50% / are used as as operating contacts, and contact bodies of silver-tungsten / 25-30% / - as arcextinguishing contacts for powerful breaks.
Silver contains contacts bodies - Technical characteristics
Constructional material
Chemical composition %
Denity q/cm³
Hardnes Hb
Conductivity m/Ωmm                  %IACS
1
Silver
Ag 100
10.5
70
60                        108
2
Silver-cadmium oxide
Ag-Cdo 10
10.0
80
49                        82
3
Silver-cadmium oxide
Ag-Cdo 15
9.9
85
45                        75
4
Silver-cadmium oxide
Ag-Cdo 20
9.8
90
41                        68
5
Silver-copper oxide
Ag-Cu0 10
9.7
70
42                        70
6
Silver-zinc oxide
Ag-Zn0 8
9.6
75
47                        78
7
Silver-zinc oxide
Ag-Zn0 11
9.4
80
43                        72
8
Silver-zinc oxide
Ag-Zn0 15
9.1
85
39                        65
9
Silver-tin oxide
AgSn0 8
9.9
85
49                        82
10
Silver-tin oxide
AgSn0 12
9.8
90
44                        73
11
Silver-nickel
AgNi 10
10.1
85
49                        82
12
Silver-nickel
AgNi 20
10.0
95
46                        76
13
Silver-nickel
AgNi 30
9.9
105
42                        70
14
Silver-graphite
Ag-C 3
9.0
46
50                        81
15
Silver-graphite
Ag-C 4
8.8
44
46                        76
16
Silver-graphite
Ag-C 5
8.6
42
42                        70
17
Wolfram-silver
W-Ag 25
15.5
210
24                        40
18
Wolfram-silver
W-Ag 30
15.0
200
25                        42
19
Wolfram-silver
W-Ag 40
14.2
170
28                        46
20
Wolfram-silver
W-Ag 50
13.2
140
31                        52