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9 Moulded Case Breakers 0115
ABB Low Voltage
Icc = 50 kA
XT1C
ABB |
SACE Tmax Moulded-case circuit-breakers 7
Selectivity
As can be seen from the selectivity tables, there is total selectivity (T), equal to 50 A, between a Tmax
XT4S TM and T5S EL.
Advantages:
- Continuity of service
- Rapid identification of the fault zone
Tmax moulded-case circuit-breakers are the ideal solution for all distribution levels, from the main low
voltage switchboard to the subswitchboards in the installation. They feature high peak current and
specific let-through energy-limiting characteristics that allow the circuits and equipment on the load
side to be sized in an optimum way.
The SACE Tmax family of moulded-case circuit-breakers is available with:
n
thermomagnetic trip units for protecting direct and alternate current networks. These trip units
use the physical properties of a bimetal and an electromagnet to detect the overloads and short-
circuits;
n
electronic trip units for protecting alternate current networks. These trip units use microprocessor
technology to obtain protection functions that make the operations extremely reliable and accu-
rate.
Due to dedicated devices, the SACE Tmax family of moulded-case circuit-breakers allows the insula-
tion state of the installation to be monitored and ensures that people are protected against direct and
indirect contacts, in accordance with the reference standards.
Selectivity and back-up
Selective coordination
can be used among various protection devices in an installation when it
is necessary to minimize the problems associated with faults and abnormal service conditions.
If selective coordination is not a requirement, back-up protection can be used. This method
implies that the supply side device provides protection during a short-circuit, allowing the use
of a lower breaking capacity device on the load side.
Sup. side
T5
Version
S
Relay
EL
Model
400
400
630
Load side
I
n
[A]
320
400
630
XT4
S
TM 250
200
T
T
T
225
T
T
T
250
T
T
T
Back-up
As can be seen from the back-up tables, the back-up value between a Tmax XT1C and a T5S is 50 kA.
Advantages:
- Financial savings
Supply side
XT1 XT2 XT3 XT4
T5
T6 T7
Version
S
Load side Version I
cu
[kA]
50
XT1
C
25
50
50
50 40
2
2
2
2
Circuit-breakers for distribution
Trip unit
Frame [A]
160 250 400 500 630 800 1000 1600 2500 3200
TMD (Adjustable Thermal, Fixed Magnetic)
Tmax XT1-XT3
TMA (Adjustable Thermal, Adjustable Magnetic)
Tmax XT2-XT4-T5-T6
LS/I (Electronic trip unit)
Tmax XT2-XT4-T4-T5-T6-T7-T8
Residual Current Devices
Frame [A]
160 250 400 500 630 800 1000 1600 2500 3200
RC Instantaneous
Tmax XT1-XT3
RC Selective
Tmax XT2-XT4-T4-T5
Integrated RC Protection in release
Tmax T7-T8
RC on outside of switchboard (RCQ)
Tmax XT1-XT2-XT3-XT4-T4-T5-T6-T7
Tmax moulded-case circuit-breakers are the ideal solution for all distribution levels, from the main low
voltage switchboard to the subswitchboards in the installation. They feature high peak current and
specific let-through energy-limiting characteristics that allow the circuits and equipment on the load
side to be sized in an ptimum way.
The SACE Tmax family of moulded-case circuit-breakers is available with:
thermomagnetic trip units for protecting direct and alternate current networks. These trip units
use the physical properties of a bimetal and an electromagnet to detect the overloads and shortcircuits;
elec ronic trip units for protecting alternate current networks. These trip units use microprocessor
technology to obtain protection functions that make the operations extremely reliable and accurate.
Due to dedicated devices, the SACE Tmax family of moulded-case circuit-breakers allows the insulation
state of the installation to be monitored and ensures that people are protected against direct and
indirect contacts, in accordance with the reference standards.
Selectivity a d back-up
Selective coordination can be used among various protection devices in an installation when it
is necessary to minimize the problems associated with faults and abnormal service conditions.
If elective coordination is not a requirement, back-up protection can be used. This method
implies that the supply side device provides protection during a short-circuit, allowing the use
of a lower breaking capacity device on the load side.
Selectivity
As can be seen from the selectivity tables, there is total selectivity (T), equal to 50 A, between a Tmax
XT4S TM and T5S EL.
Advantages
:
- Continuity of service
- Rapid identification of the fault zone
Back-up
- As can be seen from the back-up tables, the back-up value between a Tmax XT1C and a T5S is 50 kA.
Advantages
- Financial savings
. i
Version
Relay
odel
i e
I
n
[ ]
Supply side XT1 XT2 XT3 XT4 T5 T6 T7
TM
S
Load side Version
I
cu
[kA]
50
XT1
C
25
50 50 50 40
Trip unit
Frame [A]
160 250 400 500 630 800 1000 1600 2500 3200
TMD (Adjustable Thermal, Fixed Magnetic)
Tmax XT1-XT3
TMA (Adjustable Thermal, Adjustable Magnetic)
Tmax XT2-XT4-T5-T6
Tmax XT2-XT4-T4-T5-T6-T7-T8
Residual Current Devices
Frame [A]
160 250 400 500 630 800 1000 1600 2500 3200
RC Instantaneous
Tmax XT1-XT3
RC Selective
Tmax XT2-XT4-T4-T5
Integrated RC Pr tection in release
Tmax T7-T8
on outsid of switchboard (RCQ)
1-XT2-X 4-T5-T6-T7-T8
Circuit-breakers for distribution
2
2