Soft start board Class A amplifier power supply delay protection board AC 220V Features: The circuit is an original and new design The relay short-circuits the power resistor after the power-on delay Power resistors use 4 negative temperature coefficient NTC 10D-20 thermistors Ensure the load voltage rises smoothly to the mains Protect the rectifier bridge and water pond capacitor to extend the service life of the appliance Actual test 2000W load no problem With 30A 6600W sealed relay Specification: Power supply:AC 220V input and output (not more than 275V can be used) Circuit working principle Turn on the power supply,delayed energization,NTC series connection in the output load circuit Reduce and control the starting current(time delay circuit control) Short-circuit NTC after start-up is completed,and power is output directly Complete the soft start process(24V relay controls 220V voltage output) Clever circuit design,no need to connect small transformer separately Soft start mainly protects the rectifier bridge,and the big pond capacitor Avoid starting bridge and breakdown capacitor to extend its service life Package includes: 1 PCS*Class A amplifier power delay soft start board Note: Only the above package products are included Specification parameters are manually tested and may have deviation For reference only,please refer to the actual prevail,thank you