Standard by-pass switch, no need to cut down power and stop production for repair and maintenance of equipments.
标准旁路开关，定期保养和维护时不用停电待产。
The second control return circuit is composed with a mutually connected weight limit switch, security door by-pass switch and a middle relay.
第二控制回路由互相串联的限重开关、安全门旁行程开关和中间继电器组成。
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