PART 7
WIRING DIAGRAMS
DEFINITION OF SYMBOLS
TC2
B phase fuse trip coil
TC3
C phase fuse trip coil
Closing release coil
Y
Anti pump relay
01
C o n t r o l s w i t c h
BA
Bell alarm switch
PF
Power fuse
uv
Undervoltage device
A
Main power circuit A phase
B
Main power circuit B phase
M
Spring charging motor
c
Main power circuit C phase
Motor cut off switch (Shown with
closing mechanism spring discharged)
a
Auxiliary switch contact (open when breaker is open)
b
Auxiliary switch contact (closed when breaker is open)
FP BREAKER OPERATING SEQUENCE
1. Control switch 01-C closed (local close) or remote close via Terminal
2. “X” coil is energized
“b” contact of the “Y” relay,
contact of the breaker auxiliary switch,
and
contact of the motor cut-off switch.
3. Stored energy closing spring released via
coil, closing breaker.
4. Closing breaker operates auxiliary switch opening “b” contacts and closing “a” contact thus energizing
anti pump
relay and
“X” coil.
5. “Y” relay remains energized via seal-in contact thus providing anti-pumping lockout of “X” coil if
held closed
Cl
6. “Y” relay is de-energized when #contact is opened.
7. Closing breaker, closes auxiliary switch “a” contacts permitting the breaker to be tripped electrically
when control
power
is switched to auxiliary stabs
and 6B.
Motor cut-off switch contact “bb” closes when spring discharges and
when spring is fully
charged.
9. Auxiliary switch
contact closes when the breaker is tripped.
10. Motor cut-off switch contact
when the closing mechanism spring is fully charged.
11. The breaker will close when control switch
