Table of Contents
Advertisement
TYPE CA-S RELAY
IIIOIC.HIK,;
WilT ACTO�
SorjlfCn
fliOTE:
TE�M. �. 6 & d
... �( TV 6£ JIJHPEiiEO
AT RElAY CASE
FROftT VIEW
Fig. 1. Internal Schematic
of
Type FT21 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 annature, to which
leaf-spring mounted contacts are attached, is attracted
to the magnetic core upon energization of the switch.
two stationary con tacts,
When the switch closes, the moving contacts
completing the trip circuit.
Also during this operation two fingers on the annature
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 at 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 annature, to which
leaf-spring mounted contacts are attached, is attracted
to the magnetic core upon energization of the switch.
2
OPEIIATIIIGCOIL
RES T RAINT
COILS
A
S I
_
il(� HANDLE
Ch
S
S OPER.t.TEil
ShOHI�" SJIITCri
rESTSYIITCit
CURREIIT rEST �ACA
183A037
the Type CA-5 Relay in the
bridge
(IIT)(When Supplied)
IIIOICA.TIIIQ
COU.lctOR
SWITCH
IIO'R:
rv..�.�>
ARETOBEJIJHPEREO
� d
AT RElAY CASE
Fig. 2. Internal Schematic
Indicating Instantaneous Trip in the Type FT21
case.
PROTECTED EQU
A.
PROTECTED EQU/PMEIH
*
Fig. 3. Schematic Diagrams of the Type CA.S Relay. (A)
Shows the Foult Current Distribution for an
ternal Fault; (B) The Distribution for an Internal
Fault.
IIIDICATIIQ
IISTAUUEOUS
TRIP'
OI'£UTII6
COIL
RESTRAIIIT COilS
WITCH
CU.:SIS ltl'lMTID
SIIOITIMt
lED
IIAIIDLE
TEST SWITC"
CURIEIIT TEST ,lAt.�
FROMT 'flt:V
183A036
the Type CA-S Relay with
of
PMEMT
I
EXTERIU.L
FAULT
183A359
Ex
Advertisement
Table of Contents
