Instruction manual

KRB-5377
36
z Do not leave the ACB body on the draw-out rail pulled out.
4) Make sure the breaker fixing bolts (Fig. 29
◯
2
), if fitted, are loosened and not arrest the breaker body.
5) Make sure the hand connector (Fig. 29
◯
15
) of the communication terminal block, if fitted, is so positioned that it does not get
caught between the breaker body and the draw-out cradle.
6) If the ACB has the breaker fixing bolts (Fig. 29
◯
2
), make sure the bolts are loosened and, holding both the grips (Fig. 29
◯
10
),
firmly push the breaker body into the draw-out cradle.
z If the ACB is equipped with the communication terminal block, plug the hand connector (Fig. 29
◯
15
) into the communication
terminal block while pushing the breaker body. Into the draw-out cradle. Make sure the hand connector and control wire of
the ACB are not snagged when pushing the breaker body into the draw-out cradle.
7) Push the rail stoppers (Fig. 29
◯
8
) outward on both sides of the draw-out cradle (Fig. 29
◯
12
) to unlock the draw-out rail, and
then push the rail ends to insert the rail until it stops. The draw-out rail will be locked again by the stoppers.
Fig. 30 Placing the breaker body on the draw-out rail
4-2-3-2. Moving the breaker body from the ISOLATED position to the TEST position
1) Make sure the ON-OFF indicator (Fig. 29
◯
13
) shows “OFF”. (If the ACB remains closed, the draw-out handle (Fig. 29
◯
1
)
cannot be inserted).
2) Unlock the position lock lever (Fig. 29
◯
14
) if locked. See section 4-5.
3) Insert the draw-out handle into the draw-out handle insertion hole (Fig. 29
◯
4
). And slowly turn clockwise until the handle
cannot be turned. The position indicator (Fig. 29
◯
5
) shows “TEST”.
z The ACB cannot be closed as long as the draw-out handle is in the draw-out handle insertion hole. To close the ACB e.g., for
ON-OFF testing, remove the draw-out handle.
4-2-3-3. Moving the breaker body from the TEST position to the CONN. position
1) Open the ACB. (If the ACB remains closed, the draw-out handle (Fig. 29
◯
1
) cannot be inserted).
2) Unlock the position lock lever (Fig. 29
◯
14
) if locked. See section 4-5.
3) Press the release button (Fig. 29
◯
6
). The release button will be locked depressed.
4) Insert the draw-out handle into the draw-out handle insertion hole (Fig. 29
◯
4
). And
turn clockwise until the handle cannot be turned with its max. operating torque
(14.7 N-m). The position indicator (Fig. 29
◯
5
) shows “CONN.”
Turning the draw-out handle will unlock the release button. Fig. 31 Handle operating torque
z When the main contact starts engaging, the force required to turn the handle will increase as shown in Fig. 31. This symptom
does not mean a malfunction. Continue to turn the handle. Rotating the handle more 13 or 14 turns moves the breaker body
to the CONN. position, where the handle cannot be turned with its max. operating torque.
5) Remove the draw-out handle.
6) Tighten the breaker fixing bolts (Fig. 29
◯
2
), if used, to lock the breaker body.
Breaker body
Breaker body rollers
Draw-out cradle
Draw-out rail
13 or 14 turns
TEST CONN.
Operating torque
Position