转动点火钥匙，弹簧的压力使“开启”位置变为“启动”位置，起动接触器闭合，使得起动电机线圈或磁性开关与电池接通。
When the ignition key is turned against spring pressure past the on position to start, the starting contacts close. This connects the cranking-motor solenoid or magnetic switch to the Battery.
把任一个控制手柄拨到工作位置上，再按“起动”按钮，总接触器应不动作，则说明零位保护已发挥作用。
Put any control handle to the working position, press the "start" button, the total contactor should not move, then explain the zero position protection has played a role.
柜内还装有电流表、电压表、自动空气开关、指示灯、交流接触器、工频变频转换开关及起动、停止按钮等。
Inside is arranged ammeter, voltmeter, air circuit breaker, indicator, ac contactor, conversion switch, and buttons for starting or stopping.
介绍三相异步电动机起动时，通常按照一定的时序接通或关断2到3台接触器来实现电动机的起动。
When start up a 3-phase asynchronous motor, it is generally realized by energizing or de-energizing 2 to 3 contactors in a certain time order.
提供了各国的接触器或起动器与熔断器成功地协调配合的实例和技术数据。
The successful coordination examples and technique data of contactor or starter and fuses in various countries are given.
④将所有操作手柄拨在中位，按动“起动”按钮，查看总接触器的动作情况，再按“停止”按钮，总接触器应跳开。
Put any control handle to the working position, press the "start" button, the total contactor should not move, then explain the zero position protection has played a role.
问题：3RW40软起动器是否需要设计外置旁路接触器？如加外置旁路接触器会有何影响？
Question: Is it necessary to add external bypass contactor for 3RW40 softstarter? What's the result when adding external bypass contactor for 3RW40 softstarter?
问题：3RW40软起动器是否需要设计外置旁路接触器？如加外置旁路接触器会有何影响？
Question: Is it necessary to add external bypass contactor for 3RW40 softstarter? What's the result when adding external bypass contactor for 3RW40 softstarter?
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