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1 channel active low relay board with 5V relays capable of being switched on-off by an opto-isolated digital input The relay is controlled by a microcontroller connected to the output pin and require a minimum 1.5V to switch the inputs ON The module can be controlled directly by a microcontroller and are suitable for 5V applications. Maximum switching voltage: 250VAC / 30VDC, Maximum switching current: 10A Dimensions: 50 x 26 x 19mm (Length x Width x Height)