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Scope of Application

TXB8F-125 Auto Reclosing Circuit Breaker (hereinafter referred to as circuit breaker), suitable for the circuit of AC 50Hz, rated voltage up to 400V, rated current up to 80A, remote control disconnect and close the circuit breaker, can use the automatic signals to control the opening and closing of the circuit breaker at the same time, provide protection of overload and short circuit for circuits, can also be used with no-voltage release to achieve functions of opening after power-off and automatic closing after power-on. At present, TXB8F-125 Auto Reclosing Circuit Breaker is widely used in photovoltaic grid AC distribution box, and the occasions where people are hard to approach, where maintenance personnel can not arrive in time, unattended occasions, occasions with high power supply continuity requirements.
TXB8F-125 Self-Reset Circuit Breaker, is a new type researched and developed independently by TAIXI, which can achieve functions of automatically open the circuit and automatically turn on the circuit, but also achieve the effective protection for the line and terminal equipment, meanwhile feedback the state signal of closing and opening.
Standards of TXB8F-125 Auto Reclosing Circuit Breaker: GB10963.1, IEC60898-1, with the international advanced level.

Model and Meaning

Rated Current 6A,10A,16A,20A,25A,32A,40A,50A,63A,80A,100A,125A
Poles 1P+N,2P+N,3P+N
Rated Voltage Ue AC230V
Thermo - Magnetic Release Characteristic C-Curve (5-10In)
Electrical Life 4000
Mechanical Life 20000
Reference Temperature For Setting Of Thermal Element 30℃
Ambient Temperature -25~+60℃
Adapter Cable 6-63A 1-25mm² 16-3AWG | 80-125A 8-35mm² 16-2AWG

Normal Working and Installation Conditions

Ambient temperature: -25 ℃~+60 ℃;
Altitude: The altitude of the installation site is not more than 2000m;
Installation categories: Ⅱ, Ⅲ;
Installation: TH35-7.5 steel rail for installation.

Main Technical Parameters

Rated current: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A.
Poles (POLE): 1P + N single-phase, 3P + N three-phase.
Form of circuit breaker instantaneous release: C-type (5In~10In)
Electrical life: 4000 times, cos=0.85~0.9;
Mechanical life: 20,000 times
Protection class: IP20
Rated operating voltage Ue: 1P+N/2P 230V AC/50Hz; 3P+N/P 400V AC/50Hz
Automatic reclosing: tc: ≥ 3s
Rated short-circuit breaking capacity: 7500A (6-63A); 4500A (80A)
Control wire connected to external signal: conductor cross-section is 0.6mm², length is 30cm (other lengths can be specially produced) with crimped terminal.
Terminals: Auto Reclosing Circuit Breaker suitable for wire connection of 35mm or less, wiring method is tightening the wiring with screws, torque is 3.5N·m.

Over-current protection characteristic at 30℃~35℃

No. Rated current(A) Test current Initial state Set time Appointed time Remark
1 6~80 1.13In Cold t≥1h ln≤63A
t≥2h ln>63A
Non tripping
2 6~80 1.45In After the last test t<1h ln≤63A
t<2h ln>63A
Tripping The current rise steadily to
a fixed value within 5S
3 ln≤32 2.55In Cold 1s Tripping
ln>32 2.55In Cold 1s Non tripping Close the auxiliary
switch to turn on
the current
4 6~80 5In
Cold t≤0.1s

Non tripping


Characteristics of automatic reclosing-opening

Model Rated control voltage Auto closing time Auto opening time Repeat operation interval
TXB8-125 230V t<10s t<10s 3min

Current correction value used at different ambient temperatures


corrected current value(A)

Rated current(A)

-30 -20 -10 0 10 20 30 40 50 60
10 12.5 12.4 11.9 11.3 10.8 10.4 10 9.7 9.2 8.5
16 20 19.8 18.9 18.1 17.3 16.5 16 15.5 14.6 13.8
20 25 24.8 23.6 22.6 21.1 20.6 20 19.4 18.2 17.2
25 21.25 31 29.5 28.3 27 25.8 25 24.3 22.8 21.3
32 40 39.7 37.8 36.2 34.6 33 32 31 28.8 27.2
40 50 49.6 47.2 45.2 43.2 40.8 40 38.4 37.2 .5.2
50 63.5 62.5 59 56.5 54 51.5 50 48 45.5 43
63 80.01 78.8 74.3 71.2 68 64.9 63 60.5 57.3 54.2
80 101.6 100 94.3 90.4 82.4 82.4 80 76.8 72.8 68.8

Structural Features

TXB8F-125 Auto Reclosing Circuit Breaker(Self-reset Circuit Breaker), has the following characteristics:
◆ All the poles have over-current protection, short circuit protection;
◆ Rated breaking capacity up to 10KA;
Miniature Circuit breaker operating mechanism is trip-free mechanism with the energy storage, contacts are quickly closed and quickly break, overcome the adverse effects of the handle speed driven by circuit breaker in the processes of automatic opening and automatic closing, greatly improve product life; in normal work, the contact can only stay in the closing or breaking position;
◆ Automatic reclosing, openinge device, drive components are made of the SCR, integrated chip, motor, gear;
◆ Case and components are made of plastic with high flame retardant, high temperature resistance, impact resistant.

Tripping Characteristic Curve

C-type tripping characteristic curve

Wiring Requirements

36mm² and below wire connection, wiring method with screws to tighten the wiring, torque is 3.5N · 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
80 25

Application Example

Outline and Installation Dimensions

Keywords: Auto Reclosing Circuit Breaker

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