Description: 100% Brand New and High Quality Features: 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. This board does not need auxiliary power supply, only two terminals, one connected to the power input (before you can connect a switch control), an output load, the use of very convenient. Working principle: Turn on the power supply early, through the negative temperature coefficient of the thermistor to the load power supply, with the thermistor temperature increases, the resistance decreases, the voltage rises slowly, thus effectively suppress the surge current on the impact of the line and other electrical Impact. About 5 seconds after the relay pull, short-circuit thermistor, the power supply through the relay contacts directly to the load power supply, load into the normal working condition. Specifications: Name: High Power Power Soft Start Circuit Board Relay: RGL high-power super-current 100A pure copper feet relay Scope: suitable for high-end audio power input, or other large start current machine applications. Use power suitable for within 4000W Power supply: AC 150V to 280V Size: approx. 6.2x6.1cm/2.44x2.4" Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Includes: 1 x High Power Soft Start Circuit Board 1 Set x Moungting Accessories