O P E R A T I O N
53
4.1.2.2 Emergency manual operation of the
circuit breaker
On failure of the supply voltage, the circuit breaker
can be opened at any time by pressing the
mechanical OFF button. Closing of the circuit
breaker with the mechanical ON button is dependent
on the stored-energy spring mechanism being
charged. The condition of the stored-energy spring
mechanism is displayed mechanically (10 in Fig.
4.1.2.2.1).
On failure of auxiliary voltage or , it is possible to
open the circuit-breaker using the mechanical OFF
button at any time. Closing the circuit-breaker with
the mechanical ON pushbutton requires the presence
of the auxiliary voltage (without auxiliary voltage
the blocking magnet -RLE1 blocks the ON button)
and a charged spring mechanism. The state of the
spring mechanism is indicated mechanically (Fig.
4.1.2.2.1)
.
—
Fig. 4.1.2.2.1 Manual
charging of the
stored-energy spring
Manual charging of the stored-energy spring
Pump the Lever for manually charging the closing
spring (11) for approx. 25 strokes until the
charged condition (10) is indicated.
When the charged condition is reached, the charging
mechanism is disengaged, and no further
movements of the charging lever can be made.
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.
—
Fig. 4.1.2.2.1
10
11
10 Condition indicator for the stored energy spring
11 Charging lever
