Mitsubishi Electric C Series Handling And Maintenance page 64

(b) Mounting
(i) Front-connection/Rear-connection (Other than the U-series).
(i)-1 Sequential order for mounting the electrical operation type MCCB
a) Detach the four cover mount screws (A) to remove the cover.
b) Fix the electric operation type MCCB on the panel using four MCCB
mount screws (B).
c) Connect the electric operation unit to the terminal of operational circuit.
d) Fasten the cover with four cover mount screws (A).
(i)-2 Maintenance and inspection of electrical operation unit (Removal
of this unit only)
a) Detach the four cover mount screws (A) to remove the cover.
b) Remove the four frame mount screws (C).
c) Slide the electric operation unit slightly toward the power supply
side to remove the frame from hook pin.
❈ When mounting the unit on the MCCB, thread the handle between
the rollers of the bracket beforehand. The electric operation unit
has been so designed that it may be supported temporarily by the
hook pin in case of setting with screws.
❈ Mount the electric operation unit so that the end of the trip lever
matches with the position of the trip button of MCCB.
❈ The end of the trip lever projects from the plane F of the frame.
Take care not to allow the trip lever to be deformed.
(ii) Flush plate type (Other than the U-series)
a) Mounting the electric operation type MCCB
Fix the MCCB on the panel or the like using the attaching (mount)
screws (E) for flash plate.
❈ NF1600-SEW/SDW shall be mounted with the mount angle of
MCCB.
b) Maintenance and inspection of electrical operation unit (Removal
of this unit only) Same as for front connection/rear connection types.
Note. When mounting 800 AF and subsequents, the smaller slider
out of the two sorts of sliders (insulating plates) between
the bracket and cover shall be incorporated into the upper
plane, and the notched portion of the larger one into the
lower left corner.
(iii) Mounting the front-connection and rear-connection (U-series)
(iii)-1 NF400-SEW (3P)
a) Detach the electrical operation unit from the circuit-breaker.
Step 1 Detach the four cover mount screws (A) to remove the
cover.
Step 2 Remove the four frame mount screws (C).
Step 3 Slide the electric operation unit slightly toward the power
supply side to remove the frame from hook pin to remove
the electric operation unit from the circuit-breaker.
Precaution to be taken:
The end of the trip lever projects from the plane F of the frame.
Take care not to allow the trip lever to be deformed.
b) Mount the circuit-breaker on the board using four circuit-breaker
mount screws (B). The mounting onto the board is the same as
that of the circuit-breaker both for front connection and rear con-
nection types.
c) Mount the electric operation unit in the sequential order reverse to a).
Note 1. When mounting on the circuit-breaker, thread the handle
between the rollers of the bracket beforehand.
Note 2. The electric operation unit has been so designed that it
may be supported temporarily by the hook pin in case of
setting with screws.
Note 3. Before mounting the cover, connect electric operation unit
to the terminal of the operational circuit.
(A)
Frame
Cover
Trip
lever
(B)
(C)
Plane
MCCB
F
(D)
Trip
button
Mount panel
Fig. 3
Cover
(A)
Frame
Flash
(C)
plate
(D)
Plane
F
(E)
Spacer
Fig. 4
(A)
Frame
Cover
(C)
Trip
lever
Plane
F
Handle
(D)
(B)
Trip
button
Fig. 3
MCCB
NFB
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