The main contact of low-voltage circuit breaker is closed manually or electrically. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply.

当电路发生短路或严重过载时，过电流脱扣器的衔铁吸合，使自由脱扣机构动作，主触点断开主电路。

In case of short circuit or serious overload of the circuit, the armature of the overcurrent release is pulled in to make the free tripping mechanism act, and the main contact disconnects the main circuit.

当电路过载时，热脱扣器的热元件发热使双金属片上弯曲，推动自由脱扣机构动作，主触点断开主电路。

When the circuit is overloaded, the thermal element of the thermal release generates heat, bends the bimetallic sheet, pushes the free release mechanism to act, and the main contact disconnects the main circuit.

当电路欠电压时，欠电压脱扣器的衔铁释放，也使自由脱扣机构动作，主触点断开主电路。

When the circuit is under voltage, the armature of the under voltage release releases, which also makes the free release mechanism act, and the main contact disconnects the main circuit.

（1）当按下分励脱扣按钮时，分励脱扣器衔铁吸合，使自由脱扣机构动作，主触点断开主电路⑴额定电压断路器铭牌上的额定电压是指断路器主触头的额定电压，是保证接触器触头长期正常工作的电压值。

(1) When the shunt release button is pressed, the armature of the shunt release is pulled in to make the free release mechanism act, and the main contact disconnects the main circuit ⑴ rated voltage the rated voltage on the nameplate of the circuit breaker refers to the rated voltage of the main contact of the circuit breaker, which is the voltage value to ensure the long-term normal operation of the contactor contact.

（2）额定电流接触器铭牌上的额定电流是指路器主触头的额定电流，是保证接触器触头长期正常工作的电流值。

(2) The rated current on the nameplate of the rated current contactor refers to the rated current of the main contact of the circuit breaker and is the current value to ensure the long-term normal operation of the contactor contact.

⑶脱扣电流脱扣电流是使过电流脱扣器动作的电流设定值，当电路短路或负载严重超载，负载电流大于脱扣电流时，断路器主触头分断。

(3) tripping current tripping current is the current setting value that causes the overcurrent release to act. When the circuit is short circuited or the load is seriously overloaded and the load current is greater than the tripping current, the main contact of the circuit breaker will be disconnected.

⑷过载保护电流、时间曲线过载保护电流、时间曲线，为反时限特性曲线，过载电流越大，热脱扣器动作的时间就越短。

(4) overload protection current and time curve. Overload protection current and time curve are inverse time characteristic curves. The greater the overload current, the shorter the action time of the thermal release.

⑸欠电压脱扣器线圈的额定电压欠电压脱扣器线圈的额定电压一定要等于线路额定电压。

(5) rated voltage of under voltage release coil the rated voltage of under voltage release coil must be equal to the line rated voltage.

⑹分励脱扣器线圈的额定电压分励脱扣器线圈的额定电压一定要等于控制控制电源电压。

(6) the rated voltage of the shunt release coil must be equal to the control power supply voltage.

⑺额定极限短路分断能力

(7) rated limit short circuit breaking capacity

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