SCB (surge circuit breaker)-SSD ( Specific SPD Disconnector)
In the low-voltage power distribution system, the SSD ( SPD Specific Disconnector) is an external disconnection device applied in series with the surge protector, suitable for TT, TN and other power supply systems in the range of AC 50/60Hz and 230V-440V.
Features Of scb breakers-SSD (Specific SPD Disconnector)
1. The SSD ( SPD Specific Disconnecotor) is special designed for SPD according to the requirements of IEC 61643-12: Low Voltage Surge Protective Device – Part 12: Surge Protective Device Connected to Low-voltage System – Selection and Application Principles (Edition 3.0 2020-05) , to solve the problem that when the SPD has power frequency leakage current or working freaueucy follow current due to deterioration or power frequency overvoltage, The SSD acts quickly to disconnect the SPD from the power frequency distribution system but does not act when the SPD discharges the lightning electromagnetic pulse current; it effectively solves the possibility of serious accidents such as burning and explosion in the application of the SPD, At the same time, it effectively solves the problem of protection dead zone when using a fuse or a circuit breaker as external disconnecting device. In low-voltage power distribution systems, it is an ideal companion device for voltage-switching SPDs and voltage-limiting SPDs.
2. With a special design, it can accurately distinguish and identify the power frequency current and the lightning electromagnetic pulse current, and automatically make the correct action.
3. It has the functions of large current flow, low residual voltage, small power frequency tripping current and short circuit protection tripping.
Note: It is forbidden to connect other loads at the end of the SSD(SCB).
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