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New generation IZM97, 99 low voltage air circuit breaker instruction manual
MN013010EN February 2020 www.eaton.com.cn
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
OT1
C
ALM
C
OT2
C
MODB
N1
+ 24V
ALM
2
OT2M
G1
C
MM
1
ZI
N
MODG
C
MM
3
PTVA
PTV
C
ZC
OM
MODB
2C
MM
E02
-
AR
C
O
S
C
OT1M
2C
MM
OT2B
N2
ALM
1
ALM
3
G2
AR
MS
AGND
ZOUT
C
MM
2
C
MM
4
PTVB
PTVN
2C
MM
2C
MM
AR
C
O
AR
C
O
C
1
B1
C
2
C
3
B3
C
4
C
5
B5
C
6
C
7
B7
C
8
C9
B
9
C
10
C
11
B11
C
12
LCC
LC
B
ST1
SR
1
UV1+
A1
B2
A2
A3
B4
A4
A5
B6
A6
A7
B8
A8
A
9
B10
A10
A11
B12
A12
LC
M
ST2
SR
2
-
UV2
-
Frame rating modules installed on series IZM97, 99 air
circuit breakers with PXR are permanent and SHOULD
NEVER BE REMOVED. The frame rating module battery
cover with printed I
n
rating should not be changed with-
out proper reprogramming of the trip unit. The I
n
rating
programmed from the factory is displayed in the lower
left hand corner of 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
rating displayed on the LCD
screen and I
n
rating printed on the frame rating module
battery cover MUST ALWAYS AGREE.
3-4.5 Trip actuator
The low-energy trip actuator is a small electromagnetic
device that provides the necessary mechanical force to ini-
tiate 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 IZM97, 99 circuit breakers have a fixed instantaneous
non-adjustable setting. This fixed instantaneous trip will initi-
ate a trip at a high current peak which depends on the circuit
breaker type and rating. This setting is always active, regard-
less of the instantaneous setting.
Figure 3-10 Secondary connector top view
3-4.7 Non-automatic device
Series IZM97,99 is available in a non-automatic configuration.
It is derived from the corresponding IZM97,99 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.
3-5 Secondary contacts and connection diagrams
A maximum of 96 secondary wiring connection points are
available on the standard frame circuit breaker each dedicat-
ed to a specific function. The wiring points are finger safe
with no more than two wires per terminal.
