13
Mode of operation
The operating mechanism is of the stored-
energy trip-free type. The charging of the
closing spring is not automatically followed
by the contacts changing position, and
tripping function prevails over the closing
function.
When the stored-energy mechanism has been
charged, the mechanism is ready for a closing
operation at any time.
The mechanical energy for carrying out an
“Open-Close-Open” sequence for auto-
reclosing duty is stored in the closing and
opening springs.
Charging
The details of the closing spring charging
mechanism are shown in Figure 6: Stored-
energy operating mechanism (circuit breaker
shown in OPEN position) on page 12. The
charging shaft is supported in the charging
mechanism gear box (50.2), but is not
coupled mechanically with the charging
mechanism. Fitted to it are the crank (62.2)
at one end, and the cam (62.3), together
with lever (62.5), at the other.
When the charging mechanism is actuated by
hand with a hand crank (refer to Figure 9:
Use of manual spring-operation crank and
Figure 10: Manual spring-charging crank on
page 17) or by a motor (50.4), the charging
flange (cam) (62.3) turns until the driver
(50.3.1) locates itself in the cutaway part of
the charging flange (cam) (62.3), thus
causing the charging shaft to follow. The
crank (62.2) charges the closing spring
(62.0). When the closing spring has been
fully charged, the crank actuates the linkage
(55.1) via the control lever (55.2) for the
closing spring CHARGED indicator (55.0), and
actuates the limit switches (50.4.1) for
interrupting the motor supply. At the same
time, the lever (62.5) at the other end of the
charging shaft is securely locked by the close
latch pawl (62.5.2). When the closing spring
is being charged, the charging flange (cam)
(62.3) follows along, and it is brought into
position for closing when the closing spring is
fully charged.
Closing (refer to Figure 6: Stored-energy
operating mechanism (circuit breaker
shown in OPEN position) on page 12) and
Figure 7: Operating mechanism section
diagram mechanism OPEN, closing spring
DISCHARGED on page 15)
If the circuit breaker is to be closed manually,
the closing spring is released by pressing the
Close button (53.0). In the case of remote
electrical control, the close coil 52SRC (53.1)
unlatches the closing spring (62.0).
As the closing spring discharges, the charging
shaft (62.1) is turned by crank (62.2). The
charging flange (cam) (62.3) at the other end
of the charging shaft actuates the drive lever
(62.6), with the result that jack shaft (63.0) is
turned by lever (63.5) via the coupling rod
(62.8). At the same time, the levers (63.1),
(63.3) and (63.5) fixed on the jack shaft
operate the three insulating couplers (48.0)
(refer to Figure 5: Pole assembly on page 11)
for the circuit breaker poles. Lever (63.7)
changes the OPEN/CLOSE indicator (58.0)
over to OPEN. Lever (63.5) charges the
opening spring (64.0) during closing, and the
circuit breaker is latched in the closed
position by lever (64.3) with pawl roller
(64.3.1) and by pawl (64.2). Lever (63.9)
actuates the auxiliary switch (68.0) through
the linkage (68.1).
The crank (62.2) on the charging shaft (62.1)
moves the linkage (55.1) by acting on the
control lever (55.2). The closing spring
charged indication is thus canceled, and the
limit switches (50.4.1) switch in the control
supply to cause the closing spring to recharge
immediately.
Summary of Contents for 3AH35-SE Series
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