Westinghouse CA-5 Installation, Operation & Maintenance Instructions Manual page 2

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fROMT VIEW
Fig. J. Internal Schematic of the Type CA-S Relay in the
Type FT2J case.
electrical connection from the moving contact is made
through the soiral spring to the spring adjuster.
The stationary contact is mounted on a right
angle bracket fastened to the element frame through a
Micarta insulating block. A contact screw projects
through the outer end of the bracket and provides
adjustable contact separation.
Indicating Contactor Switch Unit (ICS)
The d-e indicating contactor switch is a small
clapper type device. A magnetic armature, to which
leaf-spring mounted contacts are attached, is attracted
to the magnetic core upon energization of the switch.
When the switch closes, the moving contacts
two stationary contacts, completing the trip circuit.
Also during this operation two fingers on the armature
deflect a spring located on the front of the switch,
which allows the operation indicator target to drop.
The target is reset from the outside of the case by a
push rod located a t the bottom of the cover.
The front spring, in addition to holding the target,
provides restraint for the armature and thus controls
the pickup value of the switch.
Indicating Instantaneous Trip Unit
The instantaneous trip unit is a small a-c operated
clapper type device. A magnetic armature, to which
leaf-spring mounted contacts are attached, is attracted
to the magnetic core upon energization of the switch.
2
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183A037
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AIIETOBEJIIHPERED
AT RELAY CASE
FROtt T YIEW
Fig. 2. Internal Schematic ol the Type CA-S Relay with
Indicating Instantaneous Trip in the Type FT2J
case.
PROTECTED EQUIPMENT
A.
PROTECTEr EQU I PNEKT
3.
Fig. Schematic Diagrams ol the Type CA-S Rf.·lay. (A)
Shows the Fault Current Distribution for an
ternal Fault; (B) The Distribution for an Internal
Fault.
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183A036
EXTERNAl
FAULT
183A359
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