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Product Overview: Voltage disturbances are primarily caused by external power grids and faults within the system. Such disturbances are often accompanied by voltage sags; voltage sags lasting more than 80 milliseconds can cause high- and low-voltage frequency converters to trigger alarms and shut down, as well as lead to the loss of control in secondary control circuits, resulting in the shutdown of production systems and potentially serious production accidents. There are generally two ideal ways to address voltage sags. One is to install low-voltage ride-through devices, with different low-voltage ride-through solutions tailored for various load configurations; the MSpower Boost series of such devices is designed primarily for frequency converters, while the MSpower DVR series is intended for direct-drive motors ； One method is to switch to a safe power supply using a rapid switching device; this requires the safe power supply to have sufficient capacity, the switching process to be fast enough so that sensitive devices do not notice it, thereby achieving a seamless transition with no disruptions. It also requires high reliability, enabling accurate detection of faults both within and outside the area; there are composite criteria for detecting PT wire breaks. During system voltage dips, the disturbance-free quick switching device can accurately record the voltage and current waveforms of each circuit. The FSC series of medium and low voltage disturbance-free switching cabinets are primarily composed of the DCM635 disturbance-free rapid switching device, PBG series phase-controlled high-speed circuit breakers, GMP711 microcomputer-based integrated line protection devices, as well as various transformers. They represent a new generation of integrated medium and low voltage switching cabinets. The integrated package ensures a more perfect coordination between the control unit (DCM635 disturbance-free rapid switching device), the actuation unit (PBG phase-controlled high-speed circuit breaker), and the protection unit (GMP711 microcomputer-based comprehensive line protection device), thereby enabling faster and safer switching of plant power supply. The following provides a brief introduction to the main components of the disturbance-free rapid switching cabinet. DCM635 Disturbance-Free Rapid Switching Device. The DCM-635 series of disturbance-free rapid switching devices is an upgraded version of the DCM633 series; it is widely used for ensuring disturbance-free power supply switching in continuous production facilities such as those in the petrochemical, steel metallurgy, and semiconductor industries. When there is a voltage dip in the system’s power supply, the integrated quick-switching device promptly disconnects the source with the voltage dip and quickly and safely connects the backup power supply, ensuring that the equipment remains powered without any interruptions or shocks during the rapid power switchover, thus allowing the system to operate continuously over the long term. PBG series phase-controlled high-speed vacuum circuit breakers: These high-speed circuit breakers are permanent-magnet high-speed vacuum circuit breakers featuring unique technology. They are equipped with three independent high-speed magnetic operating mechanisms, ensuring precise response for each phase; the vacuum arc extinguishing contacts move smoothly, without any occurrences of failure to close or open, or incorrect closing or opening. The timing of closing and opening across the three phases is accurate, and these circuit breakers offer excellent performance in suppressing overvoltage and inrush currents in transmission lines, transformers, capacitors, and reactors. The GMP711 microcomputer-based line protection device is a microcomputer-based unit for line protection and monitoring that enables rapid detection of faults within the system. It works in conjunction with the DCM635 to quickly isolate such faults. The device is equipped with overcurrent protection featuring three-stage directional locking, inverse-time overcurrent protection, charging protection, and overload alarm functions. Main product features ☆ Seamless switching: One-click seamless switching during normal switching operations ； When a voltage dip occurs in the power grid, it is possible to switch quickly and without disruption to the backup feed, ensuring that high- and low-voltage frequency converters, direct-start motors, soft-start motors, etc., continue to operate without stopping; the control circuits remain active; there is no overvoltage on the load bus; and no switching inrush currents occur. The switching time is less than 15 ms, enabling a truly seamless transition. ☆ Optoelectronic integrated control utilizes advanced technologies for the deep integration of optoelectronic components at both primary and secondary levels. It features an integrated design that combines quick-switching devices with high-speed switches under direct optical control; optical coding is used to precisely control the opening and closing of these high-speed switches, with a control delay of less than 200 us. This approach offers significant advantages such as fewer components, high reliability, short delay times, strong resistance to interference, and corrosion resistance. ☆ The intelligent protection FSC medium and low voltage disturbance-free switching cabinet is equipped with an independent microcomputer-based comprehensive protection device. The disturbance-free switching control system and the relay protection system are completely separate from each other, which **improves the reliability of the cabinet, enables rapid identification of faults within and outside the circuit area, and provides protection for the circuit breaker itself as well as alerts for temperature and humidity levels inside the cabinet. ☆ Disturbance recording: Automatic start of recording in the event of bus voltage disturbances; switching-based automatic recording is also available. Full documentation of voltage, current, and circuit breaker positions is provided, and it is possible to print the recorded information locally or transmit the data remotely. This facilitates monitoring of grid disturbances, inversion of switching processes, and analysis of switching-related disturbances. ☆ Remote maintenance: The cabinet is equipped with standard dual RS485 communication interfaces and dual 100M Ethernet communication interfaces, supporting common communication protocols. A 4G communication module can be installed as per the user’s requirements, enabling remote maintenance via mobile devices and waveform viewing through an encrypted gateway. Product appearance schematic Product selection table