Spring Discharge Interlock - Siemens RL Series Instructions Manual

IS-7S5-75J-•o•
Figure 4. Detail of Typical Racking Mechanism. RL-800 to RL-2000.

Spring Discharge Interlock

When racking the circuit breaker out to the DISCONNECT position, the
closing springs will automatically discharge, at or before reaching the
DISCONNECT position. The barrel nut (1 09) engages the spring
interlock. This, in turn, is connected to the manual close hood which
releases the closing springs.
IMPORTANT: On manually charged breakers, the close hood is
interlocked to the manual charge cam, and must be clear before
racking the circuit breaker to the DISCONNECT position. This
requires the manual charge handle to be in the vertical position
Note:
SET ANC1LE,
during racking.
TIGHTEN NUTS
position before charging the closing springs (either in the cubicle
Racking
Clevis
or when removed from the cubicle). Failure to comply with this
requirement may damage the mechanism, manual charging will
deform
unexpected breaker closure and/or continuous trip free operations.
The spring discharge interlock p
all of the stored energy of the springs is dissipated in the mechanism. It
is preferable to turn the motor power off in the TEST position, close and
trip the circuit breaker manually in that position, and then rack out in the
normal manner.
10
The racking mechanism must be returned to the TEST
the closing hood. Electrical
r
ce
o d u
charging will result in
s TRIP FREE operation in which