Icc = 50 kA
Icc = 50 kA
T5S
XT4S
XT1C
T5S
Total selectivity
Back-up 50 kA
6 SACE Tmax Moulded-case circuit-breakers | ABB ABB | SACE Tmax Moulded-case circuit-breakers 7
1
1
1
1
3
3
T5S 630 PR221DS LS/I 3p
Electronic trip unit PR221DS LS/I for AC applications.
Features a protection L function against overload with
adjustable current, (I
1
= 0.4…1xIn), and timing. Protection
against short-circuit can be delayed (S), with an adjustable,
or instantaneous delay (I). The tripping threshold is adjust-
able in both cases (I
2
, I
3
= 1…10xIn).
XT1 160 TMD 3p with RC Sel
Thermomagnetic trip unit TMD for AC/DC applications. Ther-
mal protection is adjustable I
1
= 0.7…1xIn,
magnetic protection is fixed I
3
=10xIn.
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.
XT4 250 TMA 3p
Thermomagnetic trip unit TMA for AC/DC
applications. Thermal protection is adjustable I
1
= 0.7…1xIn,
magnetic protection is adjustable I
3
= 5…10xIn.
RC SEL is a selective residual current release for assembly
in conjunction with the circuit-breaker. It has adjustable cur-
rent thresholds and 2xI∆n adjustable non-actuating times.
A single family of moulded-case circuit-breakers up to 3200 A
Distribution solutions
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
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
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