| 1 |
What
is a CAM Switch? |
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A
CAM switch is one that employs the rotation of a CAM shaft
to operate a number of switching elements simultaneously.
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| 2 |
What
are the standards governing CAM Switches? |
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The
standards governing CAM switches are :
a. IEC 947-3 and IEC 947-5-1 (Control application)
b. IS 13947
c. EN 60947 |
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| 3 |
What is a utilization category? |
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Utilization
category defines the intended application of the switching
device. Although the actual utilization differs for each type
of switching device, they are all characterized by one or
more of the following parameters:
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| i.
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Values
of making and breaking currents expressed as multiples
of the rated operational voltage |
| ii.
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Values of the voltage as multiples of rated operational
voltage |
| iii. |
Values of power factor |
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| 4 |
Name
the utilization categories applicable to CAM switches? |
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Utilization
categories applicable to CAM switches are:
AC-21A - purely resistively loads
AC-22A - combination of resistive and inductive loads
AC-23A - starting and switching off of inductive loads
AC-3 - starting and switching off during running of a Squirrel
Cage Induction Motor (SCIM) |
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| 5 |
Can
customers get any additional features in GT? |
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Customer
can ask for additional features like inclusion of auxiliary
NO/NC, extended terminals, MS back plate etc.
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| 6 |
What
is a make before break switch? |
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If
in a pair of auxiliary contacts (1NO + 1NC), the normally
open contact closes before the normally closed contact has
opened; we refer to the pair as "make-before-break"
contacts.
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| 7 |
Can
GT CAM switches be used for DC applications? |
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Yes,
GT CAM switches can be used for DC applications based on a
rating chart which is available on request.
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| 8.
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How
is the life of a CAM switch determined? |
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The life
of a CAM switch is determined based on two parameters:
i. Mechanical life
ii. Electrical life
GT CAM
switches possess a mechanical life of one million operations
and an electrical life of a few thousand operations.
To achieve
the stipulated working limits, due diligence must be exercised
in choosing an appropriate current rating based on the load
conditions and other environmental factors.
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| 9 |
Does the smooth working of the knob determine the quality of
a CAM switch? |
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No. In
fact a slightly harder knob mechanism ensures proper opening
and closing of contacts.
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| 10 |
What should an OEM look for before choosing a particular brand
of CAM switch? |
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i.
Wide current range
ii. Versatile range of accessories
iii. Continuous product development and constant technology
upgradation
iv. Worldwide recognition of the brand |
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| 11 |
What
are the various mountings available in a CAM switch? |
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i. Panel
mounting without anchorage plate
ii. Panel mounting with anchorage plate
iii. Central fixing
iv. Base mounting with direct handle
v. Base mounting with panel handle
vi. Switch mounted inside an enclosure
In GT
CAM switches, all the above mountings are available.
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