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New generation IZM97, 99 low voltage air circuit breaker instruction manual
MN013010EN February 2020 www.eaton.com.cn
Section 4: Accessory devices
Mounting panel (J)
M6 hexagon screw
(A) and self-locking
washer (C)
M6 tapping screw
(M) and self-locking
washer (L)
Interlock
assembly (G)
Cable bracket (K)
M6 square nut (F) –
plane facing out
M6 spacer
washer (I)
M6x20 hexagon
screw (D) and
self-locking
washer (C)
M6x12 hexagon
screw (A) and
self-locking
washer (C)
M6 square screw
located at the rear of
the support bracket
Upper control lever
Remove screw and
grounding wire
Tripper
bar
Drive
arm
Grounding
wire
Step 5: Install the interlock assembly from Step 4 to the right
side of the circuit breaker. First remove the M6 hexagon screws,
nuts, self-locking washers and ground wires installed in the lower
front corner of the support bracket. Finally, re-install these screws
through the adapter panel.
Install M6 square nuts (F) into the slot on the upper rear of the
housing, with the plane facing out. The nut must be fit well in the
slot. Combine M6 * 20 hexagon screws (D), self-locking washers
(C), spacer washers (I) and square nuts. Install another driven
square nut into the slot in the upper parts of the housing to facil-
itate the installation of the square nut. Connect another M6 * 20
hex screw, self-locking washer, spacer washer to this driven square
nut. Make sure that the spacer washer fits perfectly onto the hous-
ing, and the self-locking washer fits fully into the screw head. This
will provide a sliding space for the slot on the top support panel.
Now insert the screw to the mounting bracket slot and rotate the
bracket down to fit on the side of the circuit breaker. It is necessary
to ensure that the drive arm slides into the back of the tripper bar
and the driven part slides into the rear of the drive arm connecting
shaft.
Re-install the screws previously removed and ensure good ground-
ing. Tighten the upper screws to ensure stability. Now pass a M6
* 12 hexagon screw and M6 self-locking washer through the back
panel and support bracket, and interlock with the square nut to fas-
ten the back panel onto the support bracket. Torque to 7-9Nm.
Figure 6. Step 4
Figure 7. Step 5
Step 6: Re-install the front cover removed in Step 1
Step 7: This step describes cable routing. Make sure that all cables
move freely in their cable housings before installation. When con-
necting a circuit breaker to another circuit breaker, make sure that
the cable housings have no sharp bends and the total number of
bends is minimized. The minimum cable bend radius is 102mm.
After installing and adjusting the cable, it is necessary to attach
cable housings to a proper number of bends along the cable. Use
plastic clamps and harnesses to minimize cable entanglement.
Check again to ensure cables move freely after installed.
Step 8: This step describes how to attach a cable to its interlock
mechanism. The drive long rod is shown below. Unscrew the nut
and spacer sleeve from the end of the long rod. Slide the rubber
boot towards the tip of the long rod. Unthread the spacer nut and
slide the nut and self-locking washer together towards the bottom.
Insert the threaded end of the long rod into the swivel ring, and
slide the smaller diameter portion of the long rod into support panel
slot. Raise the cable assembly until the threaded portion of the
drive rod enters the slotted hole, then lock the spacer washer and
nut. Adjust the two spacer nuts to have the long rod approximately
centered on the cable support bracket and hand tighten the screw.
Slide the rubber boot back into place over the end of the drive rod.
Place the sleeve and upper nut on top of the long rod. The lower
nut should be shouldered against end of thread and upper nut
tightened against the sleeve. Torque to 3.3-4.5Nm for lower nut.
Repeat the above steps to install other cable ends on the interlock-
ing mechanism of other circuit breakers. The only difference is that
a compression spring is placed between the swivel ring and exter-
nal nut for the drive rod (short version). Remove the spring before
installation and replace it when installing the rod top nut.
Figure 8. Step 7
