Materials
Connectewll
terminal blocks are made of carefully selected materials, insulating
materials, clamping and conducting metals which are subjected to
strict quality control as demanded by stringest international
standards.
Clamping
Screws
One
of the most important parts of the terminal block is the screw.
Quality of the connection depends mainly on quality of the screw.
The screw must not get damaged, should withstand a higher
torque than that stipulated in specification. The screw should not
even at the highest stress, weld with the metal of the main thread.
Connectwell
terminal block employ cold forged rolled threaded steel screws. In
cold forged rolled threaded screw, material is compressed and
therefore strengthened. Whereas in turned screw, material is removed
between the threads when it is cut. Because of this and the stress
concentration on the neck of the screw, the turned screw is
considerably weaker in strength.
The
screws are zinc plated and chromate passivated for good galvanic
surface.
Clamping
yoke
Clamping
yokes in carefully selected grade of steel ensure high torque
performance necessary for gas tight connection. The clamping
components (both screws and yokes) are electroplated
with
zinc and passivated by additional golden yellow chromate coat. Zinc
provides cathodic protection to steel. Therefore the effect of
protection against corrosion is still retained even when plating is
partially damaged by scratches or pores.
The
clamping components of some of Connectwell terminal blocks are made
of copper alloys. Such components are electroplated with either
nickel or tin to ensure oxidation free performance
Current
carrying /Conducting components
The
current carrying / conducting components / current bars are made of
electrolytic grade copper or copper alloy to ensure very low contact
resistance. The components are electroplated with tin / nickel /
tin-lead to provide oxidation free contact.
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