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Scope of Application

TXC65-63 6KA Circuit Breaker (also called 6KA Household MCB, similar to CHINT NB1-63) is used for the circuit of AC 50Hz, rated voltage of 110V/230/400V, rated current of 1A, 2A, 3A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 60A, 63A to protect overload and short-circuit, as well as use for normal circumstances of the infrequent circuit conversion, also be used as the isolating switch for cut-off circuit to protect circuit and equipment.
6KA Circuit Breaker (6KA Household MCB) are used for industrial, commercial, high-rise and civilian residential and other places.
Meet the standards: GB10963.1, IEC60898-1.

Model and meaning

Technical parameter

■ Rated current: 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
■ Rated working voltage: 110V, 230V ~ (1P, 1P + N), 400V ~ (2 ~ 4P, 3P + N)
■ Isolation
  □ Mechanical contact indication window, realistic cut-off instructions
  □ The window is green and the contact is in the open state. The window is red and the contact is in the closed state
■ Impulse withstand voltage: 4kV
■ Max withstand current: 6kA Circuit Breaker
■ Mechanical life: 20,000 times
■ Electrical life: 10000 times
■ Ambient temperature
  □ Use ambient temperature: -5℃~+40℃
■ Wiring
  □ Tunnel type terminal block
  □ Terminal area: 1 ~ 63A, for the wire of 25mm ² and below
■ Accessories
  □ OF auxiliary contact, SD alarm contact, MX + OF shunt release, MV over-voltage release, MN undervoltage release, MV + MN over-voltage release
■ Tripping characteristics
  □ Type B curve
Protect load of smaller short-circuit current (such as power supply, long cable, electric motorized vehicles, etc.)
Tripping characteristics: instantaneous trip range (3-5) In
  □ Type C curve
Protect conventional load and distribution cables (such as home lighting boxes, power distribution boxes, etc.)
Tripping characteristics: instantaneous trip range (5-10) In
  □ Type D curve
Protect impact load with the large starting current (such as motors, power counters, transformers, etc.)
Tripping characteristics: instantaneous trip range (10-14) In
■ Installation method:
  □ Mounted on the TH35-7.5 steel rail.

MCB Circuit breaker power consumption per pole

Rated current In(A) Maximum power consumption per pole(W)
1~10 2
16~32 3.5
40~63 5

Rated short - circuit breaking capacity

Rated current(A) Tripping curve
B C D
1~40 6KA 6KA 6KA
50,63 6KA 6KA 6KA

Mechanical Electrical Life

Category Time Operating frequency(time/h) Rated current A
Electrical life 10000 240 1~32
120 40~63
Mechanical life 20000 240 1~63

Over-current protection characteristics (reference temperature 30 ℃)

No. Trip type Rated current(A) Initial state DC Set time Prosrective result Remark
a B、C、D 1~63 Cold 1.13In t≤1h Non tripping
b B、C、D 1~63 After the last 1.45In t<1h Tripping The current rise steadily to a fixed value within 5S
c B、C、D In≤32A Cold 2.55In 1s<t<60s Tripping
In>32A 1s<t<120s
d B 1~63 Cold 3In t≤0.1s Non tripping
5In t<0.1s Tripping
C 5In t≤0.1s Non tripping
10In t<0.1s Tripping
D 10In t≤0.1s Non tripping
14In t<0.1s Tripping

Tripping characteristic curve

Temperature(℃)
Corrected current value(A)
Rated current(A)
-35 -30 -20 -10 0 10 20 30 40 50 60 70
1 1.3 1.26 1.23 1.19 1.15 1.11 1.01 1 0.96 0.93 0.88 0.83
2 2.6 2.52 2.46 2.38 2.28 2.2 2.08 2 1.92 1.86 1.76 1.66
3 3.9 3.78 3.69 3.57 3.42 3.3 3.12 3 2.88 2.79 2.64 2.49
4 5.2 5.04 4.92 4.76 4.56 4.4 4.16 4 3.84 3.76 3.52 3.32
6 7.8 7.56 7.38 7.14 6.84 6.6 6.24 6 5.76 5.64 5.28 4.98
10 13.2 12.7 12.5 12 11.5 11.1 10.6 10 9.6 9.3 8.9 8.4
16 21.12 20.48 20 19.2 18.4 17.76 16.96 16 15.36 14.88 14.24 13.44
20 26.4 25.6 25 24 23 22.2 21.2 20 19.2 18.6 17.8 16.8
25 33 32 31.25 30 28.75 27.75 26.5 25 24 23.25 22.25 21
32 42.56 41.28 40 38.72 37.12 35.52 33.92 32 30.72 29.76 28.16 26.88
40 53.2 51.2 50 48 46.4 44.8 42.4 40 38.4 37.2 35.6 33.6
50 67 65.5 63 60.5 58 56 53 50 48 46.5 44 41.5
63 83.79 81.9 80.01 76.86 73.71 70.56 66.78 63 60.48 58.9 55.44 52.29

Current correction factor used at different altitudes

Trip type Rated current(A) Current correction factor Example
≤2000m (2000~3000)m ≥3000m
B、C、D 1、2、3、4、6
10、15、20、25
32、40、50、63
1 0.9 0.8 Rated current used after the
product of rated current of
63A derates capacity in
2500m:0.9x63=56.7A

Wiring installation

Current grade(A) Screw Rated torque(N·m) Ultimate torque(N·m) Standard torque(N·m)
1~63 M5 2.5 4.5 2.0

Wiring:25mm2 and below wire connection, wiring method is screws to tighten the wiring, the torque is 2.5N · m.

Rated current In(A) Copper conductor nominal cross-sectional area(mm²)
1~6 1
10 1.5
16、20 2.5
25 4
32 6
40、50 10
63 16

Structural features

High rated short circuit breaking capacity: TXC65 is 6KA Miniature Circuit Breaker.
Dual wiring function, the outlet terminal can be easily connected with the standard bus and hardwire, the incoming terminal can be connected with the hard line.
With red and green safety instructions, higher security.
The mechanism has a storage operation, fast contact closure, to overcome the adverse effects of manual handle speed, greatly improving product life.
The terminals have a forked tail with a function of preventing erroneous wiring, which improves wiring efficiency and reliability.
TXC65 6KA Household circuit breakers can use a variety of modular accessories, such as S9, V9, XF9, XF9J.
Box and other plastic parts with high flame retardant, high temperature, impact resistance made of plastic.
Applicable working conditions and working environment: Ambient temperature: -35 ℃ ~ +70 ℃. When the ambient temperature is not a reference value of 30 ° C, refer to Table 7 for the modified coefficient current value.

Outline and installation dimensions

Relevant Keywords: 6ka Miniature Circuit Breaker, 6KA MCB, Household Circuit Breaker, CHINT NB1-63,


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