| 低压断路器的主触点是靠手动操作或电动合闸的 |
| 添加时间：2018/12/15 16:29:23 浏览次数： |
| 低压断路器的主触点是靠手动操作或电动合闸的。主触点闭合后，自由脱扣机构将主触点锁在合闸位置上。过电流脱扣器的线圈和热脱扣器的热元件与主电路串联，欠电压脱扣器的线圈和电源并联。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。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。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。分励脱扣器则作为远距离控制用，在正常工作时，其线圈是断电的，在需要距离控制时，按下起动按钮，使线圈通电。 The main contacts of low-voltage circuit breakers are operated manually or electrically. After the main contact is closed, the free release mechanism locks the main contact at the closing position. The coil of the overcurrent release and the thermal element of the thermal release are in series with the main circuit, and the coil and the power supply of the undervoltage release are in parallel. When the circuit is short-circuited or seriously overloaded, the armature of the over-current tripper is sucked, which makes the free tripping mechanism act and the main contact disconnects the main circuit. When the circuit is overloaded, the heat element of the thermal release makes the bimetal sheet bend and pushes the free release mechanism to move. When the circuit is under-voltage, the armature of under-voltage release device is released. It also makes the free release mechanism move. Excitation tripper is used as long-distance control. In normal operation, its coil is cut off. When distance control is needed, the start button is pressed to make the coil energized. |
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