Length, Width or Dia. below 5.0mm: “t” is better between 0.9mm~1.2mm;
Length, Width or Dia. over 5.0mm: “t” is better between 1.2mm~3.0mm
R
Type：
Length, Width or Dia. below 10.0mm: “t” is better between 1.0mm~2.0mm:
Length, Width or Dia. over 10.0mm: “t” is better between 1.5mm~2.5mm
Remark:
The more contact area is, the
thicker the contact thickness should be to avoid the
deforming due to thickness deficient.
3.
Cambered Surface ( R ):
(1)Cambered
surface includes：
Long-side camber, short-side camber and sphere camber. Don’t use sphere camber to the
utmost. Sphere camber is hard to produced because of its high hardness.
(2)The
curvature of cambered surface is easily changed after being heated and oxidized,
Thus, it requires bigger tolerance. The general tolerance is ±10R.
4.
Corner Radius ( r ):
The natural formed corner radius after grinding process of oxidized contact tip is the first option, or else the normal permissible corner radius 0.3r could be adopted.
5.
Brazing Alloy (Solder Backing):
(1)Cadmium-free
brazing alloy such as BAg-5 & BAg-6 are
recommended. But the contacts
for MCCB could be brazed with BCuP-5
as MCCB requires less life cycle than other types
of switches.
(2)The
utility extent of brazing alloy depends on the contact area accordingly. (The bigger area
is, the larger utility extent shall be.) The brazed area should be over 50% of the contact
area. After being brazed, the bonding area should be more 70% of the contact area. The
thickness of brazing alloy depends on the material properties. After the welding process,
the welding alloy should spills from the contact surrounding closely to be visible (the
thickness is between1/2 and 1/3 of the contact
thickness).
23,
Wu-Kung 5th Rd., Hsin-Chuang City, Taipei County,
Design Reference of Internal Oxidation
Electric Contact Tips
