LBFK Switching Control Unit

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Jiangsu Sfere Electric Co., Ltd.

Anhui, China

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The LBFK series low-voltage compound switch is made up of a parallel connection between an SCR and a magnetic latching relay. It uses an internal single chip for control and allows the SCR to perform zero-passing switching, which is the act of turning on when the voltage reaches zero and turning off when the current reaches zero. The SCR's conducting time is very short (it doesn't produce heat), and after that, the magnetic latching relay is connected to begin operating. As a result, it has the benefit of an SCR switch, which prevents inrush current in the event that zero passes, as well as the benefit of maintaining power while the AC contractor operates. Defects such as heating up while the SCR is operating and sparking while the contactor switches are avoided in this scenario. It is a quite perfect switch, in a way. In particular, the magnetic latching relay's mechanical service life of millions of times and electrical apparatus service life that is longer than the design service life may ensure long-term operation because there is no inrush current or spark when the relay is turned on or off.

                                                            Rated voltage
                                                            AC wire voltage 380V±20%
                                                        
                                                            Rated frequency
                                                            50/60Hz
                                                        
                                                            Harmonic distortion
                                                            ≤5.0%
                                                        
                                                            Control voltage
                                                            5~40kvar
                                                        
                                                            Power consumption of the machine
                                                            DC12V±10%/10mA
                                                        
                                                            Consumption
                                                            ≤4VA
                                                        
                                                            Contact resistance
                                                            ≤2mΩ
                                                        
                                                            Environment temperature
                                                            -25~+55℃
                                                        
                                                            Switching times
                                                            1.20 million times
                                                        
                                                            Altitude
                                                            ≤2000m