Circuit Breaker Withdrawal; Circuit Breaker Opening Opera On - AEG ME09 Installation, Operation And Maintenance Manual

WARNING
BREAKER

1.4.4 Circuit Breaker Opening Opera on

NOTICE: If the device is a breaker it will always AUTOMATICALLY
Trip on closing or being exposed to faults that exceed the values
set or installed on the installed protec ve devices. (GT type
Electronic Trip Unit).
There are mul ple means to open the breaker.
Manually
Using the o Pushbu on (Fig. 1.0N) will open the breaker.
Shunt release
Shunt releases can be installed to open the breaker. For this the
shunt releases must be energized via the secondary disconnect
(terminals).
Undervoltage release
Undervoltage releases can be installed and will open the
breaker once their power supply drops below a certain level.
Addi onally mul ple in- and external breaker interlocking
facili es are available that, if present and ac ve, will open the
device.
Ensure the circuit breaker has been tripped, indica ng
OFF, and the main springs are fully discharged.

1.4.5 Circuit Breaker Withdrawal

Prepara on
- Neutral Pole Current Transformer
When using a ground leg current transformer (supplied with
standby ground fault), the ground leg current transformer will
be open circuited when the circuit breaker is withdrawn from its
casse e. Under certain circumstances, the current may s ll ow
in the ground giving rise to a high induced voltage at the current
transformer secondary terminals.
Under such condi ons, ensure a Carriage Switch is installed in
the casse e (see Sec on 4.4) to allow short circui ng of the
current transformer secondary terminals when the circuit
breaker is withdrawn.
- Motor operator
If a motorized spring charging unit is installed
rack the breaker to the disconnect posi on, then
close and trip the breaker to discharge the
closing springs.
1.
4
1.4-04