Scope of Application
TXCM1Z Molded Case Circuit Breaker (16A~250A, 225A~400 amp or 400 amp~ 630A DC Circuit Breaker, PV DC MCCB) is used for low-voltage power generation, transmission and distribution lines of rated voltage of DC500V, 750V and 1000V, rated current of 16A~250A, 225A~400 amp or 400 amp~ 630A to provide isolation, overload and short circuit protection, DC MCCB can also be used for infrequent making and breaking of circuits under normal circumstances.
The DC MCCB are widely used in photovoltaic power generation systems, wind power generation systems, roof building power generation systems, rail transit power distribution systems and infrastructure construction and other low-voltage DC generation, transmission and distribution application occasions.
Two release methods
Two release methods
Protection function |
Frame size |
Rated current In (A)
|
Short-circuit protection
current setting Ir (A)
|
Operation time
|
Short circuit protection
|
TXCM1Z-250
|
16-250
|
10In |
Instantaneous operation
|
TXCM1Z-400
|
225-400
|
10ln
|
TXCM1Z-630
|
400-630
|
10ln
|
Operating tolerance
|
±20% |
Thermal + electromagnetic release
Protection function |
Frame size |
Rated current In (A)
|
Short-circuit protection
current setting Ir (A)
|
Operation time
|
Short circuit protection
|
TXCM1Z-250
|
16-250
|
10In |
Instantaneous operation
|
TXCM1Z-400
|
225-400
|
10ln
|
TXCM1Z-630
|
400-630
|
10ln
|
Operating tolerance
|
±20% |
Protection function
|
Frame size
|
Rated current In (A)
|
Operating characteristics
|
Overload protection |
All series |
16~630 |
According to I²t operation
1.05In (Cold), no operation within 1h (In≤63A)
1.3In (Hot), ≤1h operation (In≤63A)
1.05In (Cold), no operation within 2h (In>63A)
1.3In (Hot), ≤2h operation (In>63A)
|
Altitude
● Altitude of TXCM1Z DC MCCB installation place in normal work is not more than 2000m.
● If you need to install it at an altitude of more than 2000m, which can be used according to the altitude factor derating table.
Derating factor of altitude corresponds to the circuit breaker
Altitude (m) |
2000 |
3000 |
4000 |
5000 |
Rated frequency withstand voltage |
U |
U |
U |
U |
Max operating voltage |
Ue |
Ue |
Ue |
Ue |
Rated operating current |
In |
0.97In |
0.93In |
0.89In |
Temperature
● Can be used in the lowest temperature of -25℃, the highest temperature of +40℃.
● If they need to work at less than -25℃ or higher than +40℃, you can use them according to temperature compensation factor table.
● Consult with the manufacturer when using at less than -25℃ or more than +40℃.
Ambient temperature changes in the temperature compensation factor table
Ambient temperature
Coefficient
Model
|
+40℃
|
+45℃
|
+50℃
|
+55℃
|
+60℃
|
Derating factor |
Derating factor |
Derating factor |
Derating factor |
Derating factor |
-250 |
1In |
0.96In |
0.91In |
0.87In |
0.82In |
-400 |
1In |
0.94In |
0.87In |
0.81In |
0.73In |
-630 |
1In |
0.93In |
0.88In |
0.83In |
0.76In |
Note: The above derating factors are measured at current value equal to the frame rated current
Humidity
● In the ambient air temperature of +40℃, atmospheric relative humidity can not exceed 50%, if the temperature is low, you can use it under high humidity conditions.
● The monthly average relative humidity of the wettest month is 90%, and the effect of condensation on the product surface should be considered.
Standards and certification
International standard |
|
National standard |
Product standard |
G |
|
IEC 60947-1 (General rules)
|
G |
B 14048.l
|
IEC 60947-2 (Circuit breaker) |
G |
B 14048.2 |
IEC 60947-3(Switch, Isolation) |
G |
B 14048.3 |
Extreme environmental test standard |
|
|
IEC 60068-2-1
|
G |
B/T 2423.l
|
IEC 60068-2-2 |
G |
B/T 2423.2 |
IEC 60068-2-11 |
G |
B/T 2423.17 |
IEC 60068-2-30 |
G |
B/T 2423.4 |
Main technical parameters
Model of circuit breaker |
TXCM1Z-250 |
TXCM1Z-400 |
TXCM1Z-630 |
Frame rated current (A) |
250 |
400 |
630 |
Electrical performance |
Pole (P) |
3 |
4 |
3 |
4 |
3 |
4 |
Rated current In (A) |
16/20/25/32/40/ SOI
63/80/100/125/140/
160/180/200/2251250
|
225/250/315/350/400
|
400/500/630
|
Rated insulation voltage Ui (V) |
1000 |
1000 |
1000 |
Rated impulse voltage Uimp (V) |
8000 |
8000 |
8000 |
Rated operating voltage Ue (V) |
DC500 |
DC750 |
DC500 |
DC750 |
DC500 |
DC750 |
DC750 |
DC1000 |
DC750 |
DC1000 |
DC750 |
DC1000 |
Arcing distance (mm) |
≤50 |
≤100 |
≤100 |
Rated ultimate short-circuit
breaking capacity Icu (kA)
|
DC500V |
65 |
- |
65 |
- |
65 |
- |
DC750V |
40 |
50 |
40 |
50 |
40 |
50 |
DC1000V |
- |
40 |
- |
40 |
- |
40 |
Rated operating short-circuit
breaking capacity Icu (kA)
|
DC500V |
100%Icu
|
- |
100%Icu |
- |
100%Icu |
- |
DC750V |
50%Icu |
100%Icu |
50%Icu |
100%Icu |
50%Icu |
100%Icu |
DC1000V |
- |
50%Icu |
- |
50%Icu |
- |
50%Icu |
Rated short-circuit making
capacity Icm (kA)
|
100%Icu |
100%Icu |
100%Icu |
Use category |
A |
A |
A |
Electrical life (times) |
5000 |
1000 |
1000 |
Mechanical life (times) |
Maintenance-free |
10000 |
5000 |
5000 |
Have maintenance |
20000 |
10000 |
10000 |
Connection and installation |
Outline dimensions (mm) |
Width (3P/4P) |
107/142 |
150/198 |
182/240 |
Length |
165 |
257 |
270 |
Height |
104.5 |
104.5 |
108.5 |
Time / current characteristic curve
Time / current characteristic curve of TXCM1Z-250

Time / current characteristic curve of TXCM1Z-400(including 400 amp DC Circuit Breaker)

Time / current characteristic curve of TXCM1Z-630(including 400 amp DC Circuit Breaker)

Wiring mode
Wiring mode of circuit breaker in different voltage and different DC system

Different power system / load wiring mode
Rated operating voltage |
Power / load wiring mode |
Ungrounded system |
Negative grounded system |
Neutral point grounded system |
DC500V |
E |
- |
- |
- |
E |
- |
- |
- |
- |
DC750V |
E |
- |
- |
- |
- |
- |
- |
- |
H |
DC1000V |
- |
- |
- |
H |
- |
- |
- |
- |
H |
Note: (1) In the negative grounded system, the wiring must be according to the above table.
(2) In the ungrounded system and the neutral point grounded system, use the wiring on the table. User page
can exchange the positive and negative based on the actual situation, but also can exchange wiring position
of the power supply and load.
DC system applications
Choosing circuit breakers in a DC system need to mainly consider the following aspects:
● Rated operating voltage, consider the breaking poles in series
● Rated current, consider the load power
● Breaking capacity, consider the max short-circuit current at the installation point
System type |
Grounding system |
Ungrounded system |
Negative grounding |
neutral grounding |
Various fault types |
|
|
|
Fault effect |
Fault 1 |
Produce max
short-circuit current,
contact connecting to
the positivepole of
the power supplyis off
|
U/2 voltage produces
the nearest max
short-circuit current,
contact connecting to the
positive pole of the
power supply is off
|
No effect |
Fault 2 |
Produce max
short-circuit current,
but the contacts in
series are broken
|
Produce max
short-circuit current,
but the contacts
in series are broken
|
Produce max
short-circuit current,
but the contacts in
series are broken
|
Fault 3 |
No effect |
The same as the fault I,
but only for contacts
connecting to the
negative pole of
the power supply
|
No effect |
The worst situation |
Fault I |
Fault I and II |
Fault II |
Breaking poles situation |
Can be connected
to the positive
pole in series,
carry out the
breaking together
|
For every pole,
carry out the breaking
of the maximum short-circuit
current at U/2
|
The poles carry out
the breaking together
|
Outline and installation dimension
Front plate wiring of TXCM1Z-250 3-pole (mm)

Front plate wiring of TXCM1Z-250 4-pole (mm)

Front plate wiring of TXCM1Z-400 3-pole (mm)

Front plate wiring of TXCM1Z-400 4-pole (mm)

Front plate wiring of TXCM1Z-630 3-pole (mm)

Front plate wiring of TXCM1Z-630 4-pole (mm)


Quick sizing
The cross-sectional area of the TXCM1Z connecting wire and the corresponding rated current
Rated current (A) |
10 |
16
20
|
25 |
32 |
40
50
|
63 |
80 |
100 |
125
140
|
160 |
180
200,225
|
250
|
315
350
|
400 |
Wire sectional area (mm²) |
1.5 |
2.5 |
4 |
6 |
10 |
16 |
25 |
35 |
50 |
70 |
95 |
120 |
185 |
240 |
Rated current (A) |
Cable |
Copper bar |
Sectional area (mm²) |
Quantity |
Size mmxmm |
Quantity |
500 |
150 |
2 |
30x5 |
2 |
630,700 |
185 |
2 |
40x5 |
2 |
800 |
200 |
2 |
40x5 |
2 |
TXCM1Z 250 H P 3R 300

Keywords: DC MCCB,400 amp dc Circuit Breaker