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Check the listing for details. 1PCS 5000W 100A High-Power Soft Start Circuit Power Board for Class A Amplifier. Condition: New. Listed at 10.96 USD. Use power suitable for within 5000W. The soft-start board function is to reduce the instantaneous impact current to reduce the machine's impact on the grid and extend the life of the switch. This board uses ultra-high current (100A) pure copper foot relay and oversized thermistor NTC 20D-20, which effectively protects the machine from excessive startup current.