ABB ZX0 Manual For Installation And Operation page 51

4.1.2.4.4 Emergency manual operation
Circuit-breaker operating mechanism
− On failure of the supply voltage, the circuit-breaker can be
opened at any time by pressing the mechanical OFF but-
ton. Closing of the circuit-breaker with the mechanical ON
button is dependent on the stored-energy spring mecha-
nism being charged. The condition of the stored-energy
spring mechanism is displayed mechanically (10 in figure
4.1.2.4.4.1).
− On failure of the supply voltage or the stored-energy spring
charging motor for the circuit-breaker operating mecha-
nism, the charging process can be performed or completed
manually.
− To do this, insert the charging lever (11 in figure
4.1.2.4.4.1) into the receptacle and perform approxi-
mately 25 strokes until the charged condition is indi-
cated
− When the charged condition is reached, the charging
mechanism is disengaged, and no further movements of
the charging lever can be made.
10 Condition indicator for
the stored energy spring
11 Charging lever
12 Receptacle for charging lever
Fig. 4.1.2.4.4.1: Manual charging of the stored-energy spring
11
12
10
Circuit-breaker operating mechanism fitted with optional
blocking magnet -RLE1
The blocking magnet -RLE1 blocks the mechanical ON button of
the circuit-breaker in certain situations. This interlock is active on
failure of the supply voltage. Deblocking of the blocking magnet
requires work inside the circuit-breaker operating mechanism, and
may only be performed by qualified personnel. Contact the ABB
Service Department if necessary.
Three position disconnector mechanism
In this operating mechanism variant without a blocking magnet,
the three position disconnector mechanism can also be operated
without supply voltage as described in 4.1.2.4.3.
Three position disconnector mechanism fitted with option-
al blocking magnet -RLE3 and/or -RLE4
The blocking magnets -RLE3 and -RLE4 prevent turning of the
selector lever for operation of the disconnector or earthing switch
function of the switch in certain situations. This interlock is active
on failure of the supply voltage. Deblocking of the blocking mag-
net requires work inside the three position disconnector operating
mechanism, and may only be performed by qualified personnel.
Contact the ABB Service Department if necessary.
Indication of spring
discharged
Indication of spring
charged
Manual ZX0 HB 600 en - Revision 05 | 51