
L3447
Emax DC
16/108
L3728
Doc. No.
Model
Apparatus
Scale
Page No.
1SDH000635R0002
3
5
6
2
3
6
3
1
Fig. 25
7.2
Circuit-breaker closing and opening procedures
The operation of the circuit-breaker can be either manual or electrical.
a) Manual loading of the closing springs
– Make sure that the indicator (3) shows "O" (circuit-breaker open)
– Make sure that the indicator (6) is WHITE (springs unloaded)
– Repeatedly activate the lever (2) until the indicator (6) changes its
color to YELLOW
b) Electrical loading of the closing springs
The electrical loading of the circuit-breaker is possible when the
following accessories (supplied on request) are present:
– geared motor for automatic loading of the closing springs
– shunt closing release
– shunt opening release.
The geared motor automatically reloads the springs after each closing
operation until the yellow indicator appears (6, Fig. 25). When the power
is cut off during loading, the geared motor stops and automatically
starts reloading the springs again when the power returns. It is, in any
case, always possible to complete the reloading operation manually.
Fig. 26
Press
Fig. 27
Press
d) Opening the circuit-breaker
For manual opening of the circuit-breaker, press pushbutton “O” (1). When there is a shunt opening release, the operation can also be carried
out remotely by means of the special control circuit. Opening having taken place is signaled by the letter “O” appearing in the indicator (3).
c) Closing the circuit-breaker
The operation can only be carried out with the closing springs fully loaded. For manual closing, press the pushbutton (5) marked with the letter
“I”. When there is a shunt closing release, the operation can be carried out remotely by means of the special control circuit. The special indicator
(3) changes to indicate "I" to signal that the circuit-breaker has closed. Furthermore, the indicator of the state of the springs (6) goes to the WHITE
position. Even with the closing springs unloaded, the operating mechanism retains enough energy for the opening operation. The geared motor,
if any, immediately starts the automatic spring reloading operation.