1. IZMX trip unit, settings, tripping curves
Ralf Nikolic/ PM ACB (air circuit breaker)
December, 15th 2011

2. 1. Overview around trip units

3. Trip unit
Common trip units for IZMX16 and IZMX40

4. Trip units – basic offer
A-Type
520 LI
V-Type
520 LSI(G)
U-Type
520M LSI(G)
P-Type
1150 LSI(G/A)
Sample: IZMX40H3-A32W
Professional protection
Basic functions and optional functions
Universal protection
Selective protection
Distribution protection

5. Catalog - overview
Page 6

6. Catalog - overview
Page 7

7. Catalog - excerp: Further trip unit options
Page 39

8. Digitrip - trip units Pictures of variants
Digitrip Typ A / V
Digitrip 520M - Typ U
Digitrip 1150i - Typ P

9. Pictures: IZMX..A, V (Digitrip 520)
Variants with options V
V with Earthfault protection G A

10. Pictures: IZMX..U (Digitrip 520M)
Variants with options

11. Pictures: IZMX.. U with ARMS (Digitrip 520M)
Variants with options
V with ARMS
V with ARMS and Earthfault protection G
V with ARMS and Earthfault alarm G

12. IZMX16 and IZMX40 circuit breaker Digitrip trip units
2. Overview trip units
top -> down

13. IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Sealable transparent frontcover:
Standard
NEW
Sealing the mounting screw prevent removing the transparent front cover.
=> settings can not be changed

14. IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Reset-Button:
• indicates that the trip unit switched OFF (triped) the breaker
• Safety: Must be reset before the breaker can be switched ON after a fault.
• Optional:
- Automatic RESET
- Remote RESET (magn. Coil with different voltages)
NEU

15. IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Test socket:
connecting test devices:
IZM-TEST-KIT or
IZM-SIM-KIT
Test devices for series IZMX and IZM26 aplicable.

16. All adjustments are based on the rated current In!
IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Rating Plug
• independent from internal current transformer
exchangeable / easy plug in and safe by screw
• Responsible for rated current of the IZM
• Currents for In: 200A-4000A
For all trip units as:
A - Distribution protection
V – Selective protection
- U - Universal protection
- P – Professional protection
NEU
In cases of field installation:
The rated current of the rating plug has to be lower (or same) than the rated current of the breaker. (Safety: Coding of the white screw protect against wrong combinations)
Take into account:
All adjustments are based on the rated current In!

17. IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Differentiated trip indication
Indication of the trip cause with LED.
Indication:
- Overload
- Short circuit (delayed)
- Short circuit (un-delayed)
- Earthfault
With pushing of „Reste“ Button the LED-indication will be cleared.

18. IZMX16 and IZMX40 circuit breaker Digitrip trip units
NEW
For all trip units A, V, U same function:
STATUS LED
Off - no power to the trip unit
On Green – no aux power and not at power up level
Flashing Green – Good, microprocessor is running
Red then Orange flashing – Trip actuator is not plugged in, ROM or RAM error, calibration error, Making Current Release switch not indicating state correctly.
INST LED
Flashing Red - Instantaneous fault trip, Making Current Release trip, Maintenance mode trip
Flashing Orange – Rating plug bad or missing
LONG LED
Flashing Red - Long Time trip
Flashing Orange – Over temperature trip
SHORT LED
Flashing Red – Short Time trip
Flashing Orange – Improper Breaker Position indication
GROUND LED
Flashing Red – Ground fault trip
GROUND ALARM LED
Flashing Red – Ground fault pickup level exceeded
HIGH LOAD ALARM LED
Flashing Red – Phase Current at 85% of Long Time Pick up
or or

19. IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units same function:
Battery = Powered the LED for the trip cause request
LED for the Battery Test
Battery Test or Reset of the trip cause LED

20. 3. Setting of the protection parameters
IZMX16 and IZMX40 circuit breaker Digitrip trip units
For all trip units A,V, U same function
3. Setting of the protection parameters

21. Digitrip trip units „overview“ – setting of the protection parameters
Short circuit protection delayed (S)
all current settings
Short circuit protection un-delayed (I)
all time settings
Overload protection (L)
LED‘s for tripping cause
For all trip units A,V, U same function

22. Digitrip trip units „overview“ – setting of the protection parameters
time (t) L
Ir=0,5-1 xIn
In=4000A
2-24s
2-10 xIn S ms
2-12 xIn und OFF I
Example,Ir=0,5: 1xIr (=2000A)
(=12000A)
6xIr
current (I)

23. Time Current Curves – Long and Short
Ir = LD x In
= 1.0 x 1000A
= 1000A
Ir = Max Continuous Current Rating
In = rated current 20 10
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

24. Time Current Curves – Long and Short
Ir = 0.5 x 1000A = 500A
Ir = 1.0 x 1000A = 1000A
Ir = 0.9 x 1000A = 900A 20 10
LD = 1.0
LDT = 4 s
SD = 4
SD = Flat
SDT = 0.3s
INST = Off
LD = 0.5
LDT = 4 s
SD = 4
SD = Flat
SDT = 0.3s
INST = Off
LD = 0.9
LDT = 4 s
SD = 4
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

25. Time Current Curves – Long and Short
Ir = 1.0 x 1000A = 1000A
Ir = 1.0 x 1600A = 1600A 20 10
1600A
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off
LD = 1.0x
LDT = 10 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

26. Time Current Curves – Long and Short
Ir = 1.0 x 1000A = 1000A 20 10
LD = 1.0x
LDT = 4 s
SD = 10x
SD = Flat
SDT = 0.3s
INST = Off
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

27. Time Current Curves – Long and Short
Ir = 1.0 x 1000A = 1000A 20 10
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.5s
INST = Off
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

28. Time Current Curves – Long and Short
Ir = 1.0 x 1000A = 1000A 20 10
LD = 1.0x
LDT = 4 s
SD = 4x
SD = I2t
SDT = 0.3s
INST = Off
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

29. Time Current Curves – Instantaneous
Ir = 1.0 x 1000A = 1000A
Can not show this on this curve!
Long/Short curve is in multiples of Ir
Instantaneous is in multiples of In 20 10
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.5s
INST = Off
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.3s
INST = Off
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.5s
INST = 10x 4
TIME IN SECONDS 3 2 1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 1 4 6 10
Current in multiples of Ir

30. Time Current Curves – Instantaneous
2.0
1.0
LD = 1.0x
LDT = 4 s
SD = 4x
SD = Flat
SDT = 0.5s
INST = 10x
0.5
0.4
TIME IN SECONDS
0.3
0.2
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01 1 4 6 10
Current in multiples of In

31. Catalog Main optional trip unit functions
4. Catalog Options
(G) Earth fault protection
(A) Earth fault alarm
(M) ARMS
(Z) ZSI (Zone selective interlocking)

32. Catalog (G) Earth fault protection Power System Grounding

33. Ground Current Protection
1. Source ground: Earth fault metering at the earthed Starpoint
2. TU adds the vectors (lengths and direction) of all currents.
Load
3 Phasen + Neutral Grit
4. Accidental ground
3. Zero Sequence metering

34. Type 2. (3pole breaker) External current transformer for the N-conductor
Required:
External Transformer – wired on auxiliary terminals no. 15 and 16
External currrent transformer for IZMX40 (Article: IZMX-CT40-N)
CT with copper termination
External currrent transformer for IZMX16 (Article: IZMX-CT16-N)

35. Type 1. Source ground or Type 3. Zero Sequence metering
Type 1. Source ground: Earth fault metering at the earthed Starpoint or 3. Zero Sequence metering
1. For IZMX16 and IZMX40
Article: IZMX-EFS
3. For IZMX16 only
Required:
External current transformer – to be wired on the auxiliary terminals 17 and 18. and a jumper on Terminal 19 and 20.

36. Catalog (A) Earthfault - Alarm
An auxiliary contact close when an earth fault occur.
Comparable to earth fault protection – but without tripping.

37. Katalog (M) ARMS ARMS = Arc Reduction Maintenance System
Patent of EATON

38. IZMX16 and IZMX40 circuit breaker Digitrip trip units
without ARMS
with ARMS
Additional protection in cases of maintanance
ARMS In cases of an arc fault the tripping of the trip unit speeds up. The released energies are reduced as: Radiation, Temperature, Pressure, Forces of magnetic fields.

39. ARMS Arc Reduction Maintenance System
ARMS can be enabled manually at the trip unit or automatically / remotely by a contact before maintenance in the field begins Remote: External contact on 33, 34
An LED die displays ARMS active or an external signal lamp on terminal 11, 12.
ARMS is faster than the un-delayed short circuit protection.
A control voltage of 24 VDC (+, -10%) at the terminals 21, 22 is required.
IZMX16 / IZMX40

40. Catalog (Z) ZSI = Zone Selectiv Interlocking
ZSI is described in the Technical Report IEC/TR Low voltage switchgear and controlgear – Overcurrent protective devices – Part 2: Selectivity under overcurrent conditions.
The term zone selective interlocking is used to describe a method of controlling circuit breakers to provide selectivity with very short interruption times for the breaker closest to the fault.

41. Zone Selective Interlocking
There are different levels (zones) of protection that isolate the fault in the distribution system.
ZSI may be applied for faults between phases or earth-faults or both.
ZSI is applied to the short time faults where time selectivity can be achieved with the breakers between the zones.
Each breaker should have a ZSI unit for selectivity.
See next picture ->

42. Zone Selective Interlocking Example
CB1
tsd = 300ms
ZSI
Zone 1 1
CB2
tsd =200ms
CB3
tsd = 200ms
ZSI
ZSI 2
Zone 2 M
CB4
tsd = 100ms
CB5
tsd =100ms
ZSI
ZSI
Zone 3 3

43. IZMX16 and IZMX40 circuit breaker Digitrip trip units
5. Further information

44. Thermal Memory
Thermal Memory electronically simulates the thermal condition of the electrical load to prevent overheating caused by repeated overload conditions.
Thermal Memory function will cause faster trip times in sequential testing of breaker poles!
The electronic trip unit Thermal Memory function replicates the bi-metal function of a mechanical trip unit.

45. Thermal Memory Thermal Memory Jumper on Digitrip 520 / 520M
Program setting on Digitrip 1150

46. Thermal Memory
For all trip units same function:
A, V, U- trip unit Thermal Memory is active when the jumper is removed
P- trip unit Program setting

47. Upgrade (exchange) of trip units in the field
The trip units are now easier and saver exchangeable. Re-wiring of the important current transformers are no more risk.
Sockel
The socket contains the „acknowledge“ of the breaker IZMX16 and IZMX40:
Breakig capacity Icu / Ics
Rated short circuit withstand Icw,
max. rated current,
Max. making current
…and belongs / remains in the breaker.
The socket informs the exchangeable trip unit about this breaker data
Unmistakeable exchange of trip unit and via coding even for the rating plug
Toolless exchange (plug and work)
Socket contains the Battery, (storage of tripping causes)
Battery Test- and Reset-Button. -> The Intensity of the Battery-LED informs about the Battery condition. Longer actuation resets the tripping cause information.

48. Rogowski-sensor
The advantage of the Rogowski-sensors are the ferritless core. This results in no saturation an the CT can be uses in a wider range of current under linear and precise measuring.
The CT has an additional coil to provide the power supply for the trip unit.
IZMX40
Sensor
4000A
IZMX16
Sensor
1600A

49. – IZMX.. U with Display (Digitrip 520M)
PH1, 2, 3 = current (A) of phases L1, 2, 3
PH4 = N – neutral-current
H5 = G – earthfault-current
HI = highest phase-current
OL = Current that let to the overload trip (first in first out)
Scroll Button to display memory
HL = Phase-currrent at 85% of overload setting (Ir).
HELP = trip unit not calibrated.
9999 = highest value to display = 4 digits.

50. P-trip unit (Digitrip1150)
NEW
6. The new high end trip unit P (Professional)
„All known functions available and easy setting“
„easy adjustment for the needs and application at the trip unit…. or with the communication bus function remotely“

51. P-trip unit (Digitrip1150)
With high definition , modular…
..color grafic display

52. P-trip unit (Digitrip 1150i) further technical information
New Hardware Platform —
Digital Signal Processor – 120MHz (today 4MHz)
A minimum of 64 samples per line for each line cycle on each phase for current and voltage
New analog sensing circuit focused on higher accuracy (testing in the laboratory so far is yielding < 2% on pick-up and trip times.)
Metering accuracy will be 1% of READING
Color Graphic Display
Voltage, line to neutral readings.
Flexible communication design

53. Value of Improved Metering Capability
Example:
1% of full load (rated current) = +/- 40A
1% of READING = +/- 1A
4000A Breaker
Input of 100A
Market Standard for Breakers
60A
140A
Meter
Special Bus Bar
CT’s
IZMX with P trip unit
99A
101A
Extra Wiring
Revenue Grade Metering (PMX)
Improved metering can reduce the use of using additional metering equipment and can reduce panel assembly time
99.9A
100.1A

54. P-trip unit (Digitrip 1150i) Setting at front face1. 2.
„All known functions available and easy setting“ 1. 2.

55. P-trip unit (Digitrip 1150i) Setting at front face
„easy adjustment for the needs and application at the trip unit…. or with the communication bus function remotely“

56. External power supply for P-trip unit
IZMX16 (NF)
One PT module supplies 16 breaker
Rate to 690Vac,
One PT Module for 16 breaker
Switches integrated,
Compact housing,
DIN rail mounting on back

57. Protective Relay Features
To be highlighted:
Relay Protection package
User enable/disable with Time Delay
Adjustable under/over voltage release (trip or alarm)
Adjustable under/over frequency release (trip or alarm)
Voltage unbalance (trip or alarm)
Reverse power (trip)
Phase Rotation (alarm)
Future functionality of the 1150 will add a relay protection package. This functionality will be available at the end of 1999.
This will replace externally mounted relay protective devices, this improves the reliability of the protection scheme because it reduces the discrete wiring of these devices.

58. Digitrip 1150 Slope Selection

59. Digitrip 1150 Slope Selection
IEC A (Normal Inverse)
IEC B (Very Inverse)
IEC C (Extremely Inverse)

60. Communication „Interfaces“ IZM PROFIBUS-DP V0 Slave ModbusRTU ECAM
PCAM
MCAM
Ethernet
ModbusTCP i.V.
SMTP Mail
http(s) WebServer
IZM
ICAM
IncomBUS (USA)
IZMX 16/40

61. IZMX Communication Modules
Flexible Communication Platform —
Modbus RTU
PROFIBUS DP
Ethernet
INCOM
Module / address stays with cassette
Communications “Open” and “Close” via module not through trip unit
+24 Volt DC control power
Use with U- und P-trip units

62. Communications Open / Close via bus - Wiring
The Communication modul contains change over contacts for ON and OFF coils
Spring release SR and Ashunt trip ST in the breaker

63. IZMX Communication module installation

64. IZMX16 and IZMX40 Switch disconnector (without trip unit)
Switch disconnector INX…
Without trip unit
without internal current transformer
With making current release (MCR)