Thanks for using EUPB0205. This product is mainly used to amplify the power when the load capacity of TRIAC knob or dimming device isn＊t enough. For example, a brand dimmer C output 4 channel leading edge or trailing edge, and the maximum current is 1A/ch.If load current of one channel is larger than 1A, you need to increase the purchase of C or greater power product to meet the requirements, this will increase the cost a lot, you can choose the combination of C+ EUPB0205 to amplify the power, which can significantly reduce the cost and facilitate clients to stock up.