21IZM32 / IN32 low voltage air circuit breaker MN013017EN May 2022 www.eaton.com
Section 3: Circuit breaker description and operation
1
3
5
7
9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48
49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95
50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96
E01 +
OT1B
OT1C
ALMC
OT2C
MODB
N1
+ 24V
ALM2
OT2M
G1
CMM1
ZIN
MODG
CMM3
PTVA
PTVC
ZCOM
MODB
2CMM
E02
-
ARCO
SC
OT1M
2CMM
OT2B
N2
ALM1
ALM3
G2
ARMS
AGND
ZOUT
CMM2
CMM4
PTVB
PTVN
2CMM
2CMM
ARCO
ARCO
C1
B1
C2
C3
B3
C4
C5
B5
C6
C7
B7
C8
C9
B9
C10
C11
B11
C12
LCC
LCB
ST1
SR1
UV1+
A1
B2
A2
A3
B4
A4
A5
B6
A6
A7
B8
A8
A9
B10
A10
A11
B12
A12
LCM
ST2
SR2
-
UV2
-
Frame rating modules installed on series
IZM32 / IN32 air circuit breakers with PXR are perma-
nent and SHOULD NEVER BE REMOVED. The frame
rating module battery cover with printed I
n
rating should
not be changed without proper reprogramming of the
trip unit. The I
n
rating programmed from the factory
is displayed in the lower left hand corner in the LCD
screen whenever power is applied to the trip unit. The
I
n
displayed on the LCD reflects the actual I
n
rating of
the breaker, while the value on the battery cover is for
reference only when the LCD is not powered. The I
n
rat-
ing displayed on the LCD screen and I
n
rating printed on
the frame rating module battery cover MUST ALWAYS
MATCH.
3-4.5 Trip actuator
The low-energy trip actuator is a small electromagnetic
device that provides the necessary mechanical force
to initiate the tripping action of the circuit breaker. The
electronic trip unit provides a pulse to the coil of the
trip actuator, allowing the mechanical tripping action to
take place. The trip actuator is reset by the operating
mechanism.
3-4.6 Fixed high instantaneous non-adjustable
trip
Series IZM32 circuit breakers have a fixed instantaneous
non-adjustable setting. This fixed instantaneous trip will
initiate a trip at a high current peak which depends on the
Figure 3-10 Secondary connector top view
circuit breaker type and rating. This setting is always active,
regardless of the instantaneous setting.
3-4.7 Non-automatic device
Series IZM32 / IN32 is available in a non-automatic
configuration. It is derived from the corresponding IZM32
/ IN32 automatic breaker but does not include the trip
unit, Rogowski coil type current sensors, and the high
instantaneous trip feature. The overall dimensions and
the capability of mounting most accessory items are
maintained. Non-automatic device are tested in keeping
with IEC 60947-2 requirements.
To Next Page
Loading...
Need help?
General
