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由于电网电压波动幅度大、断缺相、过载严重等主客观原因经常造成电动机特别是三相交流电动机损坏乃至烧毁,更有甚者酿成大灾、人员伤亡等不少重大事故,给生产和生命安全带来难以预测的潜在威胁。据此,上海仪表电子技术发展中心开发了 SJDB 型系列三相交流电动机多功能保护器。该产品对电源电压营高、过低、三相严重不平衡,断相及载荷过重等异常情况,均能在一秒钟内立即切断电动机电源。用户只需选择适当规格的该种保护器,接入原电动机电路,即能对1.5kW～4.5kW 中任何功率的三种交流电动机给予保护。与机电式电动机保护器相比,SJDB 型保护器具有动作可靠、反应快,无触点吸合噪声和
Substantial fluctuations in the grid voltage, lack of phase, serious overload and other subjective and objective causes often cause motor, especially three-phase AC motor damage and even burn, and even worse lead to major disasters, casualties and other major accidents, to the production and Life safety brings unpredictable potential threats. Accordingly, Shanghai Instrument Electronics Technology Development Center developed a series of SJDB series three-phase AC motor multi-function protector. The product of the mains voltage camp high, too low, three-phase serious imbalance, phase failure and overload and other anomalies, can be immediately within one second cut off the motor power. Users simply select the appropriate specifications of the kind of protection, access to the original motor circuit, that is, 1.5kW ~ 4.5kW any power of the three AC motors to protect. Compared with electromechanical motor protector, SJDB protector with reliable action, fast response, non-contact pull-in noise and