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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.

Pollution level

● Level 3

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)

Type / Installation location /
Poles / Accessory name
TXCM1Z-250 TXCM1Z-400 TXCM1Z-630
3P 4P 3P 4P 3P 4P
Nothing - - -
Shunt release
Auxiliary contact
Undervoltage release

Shunt release
Auxiliary contact

Shunt release
Undervoltage release

Two sets of auxiliary contact

Undervoltage release
Auxiliary contact

Auxiliary contact

Alarm contact

Shunt release
Alarm contact

Auxiliary contact
Alarm contact

Undervoltage release
Alarm contact

Shunt release
Auxiliary+Alarm contact

Two sets of auxiliary contact
Alarm contact

Undervoltage release
Auxiliary+Alarm contact

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

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