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原装罗克韦尔A-B接触器 等全系列西北总代理 欢迎来电！
v 陕西欣鸿然自动化设备有限公司
v 联系人:宁辉
v 热 线：029-83338940
v 手 机：18049484083
v Q Q:271968858 Q Q:1067802570
v 传真:029-83561013
进口系列低压真空交流接触器广泛适用于，煤矿，电力，冶金，纺织。高层建筑等各种行业部门。
低压真空交流接触器适用于交流：50HZ.额定电压：1140V,额定电流63至630A的馈电网络，供远距离接通和分断电路，以及频繁起动和停止交流电动机之用。特别适宜与各种保护装置配合组装成隔爆型电磁起动器。
一种高压真空接触器
真空接触器主要由真空灭弧室和操作机构组成。真空灭弧室具有通过正常工作电流和频繁切断工作电流时可靠灭弧两个作用。但不能切断过负荷电流和短路电流。操作机构是由带铁芯的吸持线圈和衔铁构成。线圈通电，吸引衔铁，接触器闭合；线圈失电，接触器断开。吸持线圈一般有直流和交流两种形式。
真空灭弧室的外壳用玻璃或陶瓷绝缘材料制成，内部的真空度通常在0.01Pa以上。由于壳内的空气少，触头开距可以做得很小，电弧也较容易被熄灭。触头材料一般用铜、锑、锇等合金制成。灭弧室内屏蔽罩的作用是，当分断电流时，凝结触头间隙中扩散出来的金属蒸汽，有助于熄弧，还可以防止金属蒸汽溅落到绝缘外壳上降低其绝缘强度。动触头与外壳下端用波纹管连接，动触头可以上下运动又不会漏气。
真空接触器通常由绝缘隔电框架、金属底座、传动拐臂、电磁系统、辅助开关和真空开关管等部件组成。当电磁线圈通过控制电压时，衔铁带动拐臂转动，使真空开关管内主触头接通，电磁线圈断电后，由于分闸弹簧作用，使主触头分断。
真空开关管是以上封盖、下封盖、金属波纹管和陶瓷管等组成，该真空开关管，外壳采用95瓷绝缘材料制成波纹式的瓷管，它具有爬电距离大、机械强度高、耐热和耐冲击的特点。真空开关管内封装一对动静触头，触头材料采用耐磨且低截流值的Cu－W－Wc，这样在满足开断性能的条件下，减小开断过程中由于截流引起的过电压，提高了真空开关管的使用电寿命。当金属波纹管轴向运动时带动动触头做分合闸动作。
电磁系统考虑实际吸力特性和反力特性良好配合，以及发挥接触器运行时噪音低、节电的优点，采用滞留双线圈由起动和维持两绕组组成，通过辅助开关切换，为了便于用户进行交流电源操作，接触器带有桥式整流装置。
机械锁扣：当闭合线圈通电时，接触器吸合，机械锁扣锁住：当脱扣线圈通电时，机械锁扣脱扣，接触器释放，脱扣线圈在热态时，其电压在Us85%－110%范围内使接触器可靠释放。
真空接触器熄弧能力强，耐压性能好，操作频率较高，寿命长，无电弧外喷，体
真空接触器线路图
积小、重量轻、维修周期较长。真空接触器的真空灭弧室制造时工艺要求很高，如果工艺不良，灭弧室的真空容易下降。触头材料材质不好，在分断电流时会出现 "截流过电压"现象，即在分断电流时，由于真空灭弧室的熄弧能力很强，电弧电流不是自然过零时切断，而是从电流的某一值突然降到零，由此而出现高的过电压。截流电压会危及电气设备的安全运行。
· ≮本公司将期待您的来电咨询≯
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