5
Circuit breaker removal can be made easier by using a
specifically designed lifting truck (Fig. 11). Contact the nearest
sales office for availability.
Fig. 11
Caution:
• Do not allow the circuit breaker to impact onto a hard surface
while handling.
• Dragging or sliding the circuit breaker across a hard or rough
surface may damage some parts.
Mounting Circuit Breaker into
Cassette
Ensure that the racking handle is disengaged and that the
racking drive is in the reset position (Fig. 12). Fully extend the
cassette slide rails until they reach a positive stop.
Using lifting methods previously described, lower the circuit
breaker into position on the racking rails, ensuring that the
sides of the breaker moulding engage with the slots in both
racking rails (Fig. 13).
Note:
During lifting, the breakers isolating contacts (clusters)
should not be touched.
Fig. 12
Racking drive in reset position
Push the breaker into the cassette until reaching a positive
stop. The breaker is now in the DISCONNECTED position.
Fig. 13
Breaker moulding to engage with slots in racking rail
With a screwdriver, turn the racking handle shutter drive
clockwise (Fig. 5), insert the racking handle and rotate
clockwise to rack the circuit breaker into the cassette. As the
breaker approaches the TEST position check the alignment of
the fix and moving parts of the secondary circuit isolating
contacts. Re-connect the PAMM manual disconnect at this
stage where fitted.
Continue rotation of the racking handle clockwise until the
position indicator first shows TEST and finally CONNECTED.
When approaching the CONNECTED position, effort to turn
the racking handle will increase as the clusters on the breaker
engage with the cassette mounted fixed contacts.
Note:
If the breaker has been closed in the DISCONNECTED
position, it will automatically trip before reaching TEST.
If a motor spring charge or undervoltage device is fitted, these
may operate when approaching TEST position.
Remove and stow the racking handle. The breaker is now
ready for normal operation.
Removing Circuit Breaker Facia
To remove the breakers front facia, first remove the four corner
fixing screws and the charging handle grip (1 x cap head
screw, Fig.14).
Fig 14
Pull charging handle whilst easing the facia upwards for
removal (Fig 15).
Fig 15
