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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
Screw
labeling
Step 3: Move the lock of the closing coil to the “unlocked”
(upper) position, and install the hook foot into the slot as
shown. Slide the spring release device forward to make the
hook foot fully fit into the slot of the mounting panel. Move
the lock down to the “locked” position.
Figure 2. Step 3
Step 4: Re-install the front cover removed in Step 1.
IZM9 low voltage circuit breaker undervoltage
release
WARNING
(1) Only qualified electrical personnel should be permit-
ted to work on the equipment.
(2) Always de-energize primary and secondary circuits
if a circuit breaker cannot be removed to a safe work
location.
(3) Drawout circuit breakers should be levered (racked)
out to the DISCONNECT position.
(4) All circuit breakers should be switched to the OFF
position and mechanism springs discharged.
Failure to follow these steps for all procedures described
in this instruction leaflet could result in death, bodily
injury, or property damage.
Section 1: General information
The undervoltage release (UVR) opens the circuit breaker
when its supply voltage falls to between 35–60% of rated
voltage. If the release is not energized to 85% of its supply
voltage, the circuit breaker cannot be closed electrically or
manually.
Section 2: Installation of undervoltage release
Proceed with the following 5 steps to install the undervolt-
age release:
Step1: Remove the inner hexagonal mounting screws (four
for 3 pole breakers and six for 4 pole breakers) from the
circuit breaker’s front cover using a 10 mm 1/4-inch socket
wrench. Then pull down on the charging handle (by about
45° angle) to remove the front cover.
Step 2: Attach the corresponding label under “Accessories”
on the cover nameplate.
Figure 1. Step 1 and 2
Mounting panel
Hook foot
Slide forward
Closing coil
Closing coil
can only be
installed in the
middle slot
Lock
