
14
IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 2: Receiving, handling, and installation
Breaker
type
Enclosure
clearance
To insulated
surface
To grounded
metal surface
With cell
switch or
locking
facilities
Withdrawable A
B
0
25
0
25
0
25/75
Fixed
A
B
150
30
250
70
-
-
W
Width
Width of ca 75 mm
H
Height
550 mm
D
Depth
450 mm (front control panel bay)
V
Ventilation holes
320 cm² (4000-6300A)
Electrical clearance
The following information about electrical clearance is intend-
ed to provide a guideline for the installation of fixed type or
drawout type circuit breakers in an enclosure. The diagram
and related dimensions can be used for reference.
Electrical clearance dimension (mm)
Recommended safety clearances
Recommended enclosure clearance and ventilation
The typical enclosure drawing and dimension table is intend-
ed as a guideline for designing a circuit breaker enclosure.
The enclosure dimensions and required ventilation openings
should be considered at the designing phase.
Recommended enclosure/ventilation opening dimen-
sions
A
A
B
B
100
Ventilation openings
(do not cover!)
Cell switch
(optional)
Locking facilities
(optional)
D
W
H
V
V
Top or rear vent
Rear or lower vent