Siemens GM-SG - Page 38

Instrument
Transformers
Under
Construction
Under
Construction
A
:
Stepl
:
Secondary
circuit breaker is closed
.
Open
secondary
circuit breaker
.
B
:
Step
2
:
Secondary
circuit breaker is
open
.
Rotate
key
interlock
,
extending
interlock
to
block
closing
of
secondary
circuit breaker
.
Remove
key
.
Under
Construction
Under
Construction
C
:
Step
3
:
Key
interlock
on
rollout
tray
is extended
,
preventing
operation
of
handle
/
interlock bars
.
Insert
key
,
rotate
key
interlock
,
withdrawing
interlock
so
that handle
/
interlock bar is
free
to
move
.
D
:
Step
4
:
Key
interlock withdrawn
.
Operate
handle
/
interlock bar
to
allow withdrawal
of
rollout
tray
.
Figure
33
.
CPT
Fuse
Rollout
Tray
with
Key
Interlocking
36
Courtesy of NationalSwitchgear.com