Marke: SainSmart

[discontinued] 4-channel 5V USB Relay Module

SKU: 101-70-118
  • 4 SPDT relays SRD-5VDC-SL-C
  • Relay specification: 10A 250VAC/10A 125VAC/10A 30VDC /10A 28VDC
  • Power Supply - 5 VDC
  • Current consumption - 200 mA
  • FT245RL. Datasheet  (
  • Led for each relay output
  • Power Led
  • USb led
  • Size - 101*40*16mm
  • PCB parameters: FR4 / 1.5mm / two layers / metalized holes / HAL / white stamp / solder mask
  • Extra PCB openings for better voltage isolation
  • Doubled high current tracks

Supply Characteristics:

Type     SRD-5VDC-SL-C
Recommend voltage   VDC 5
Voltage limits Including ripple VDC 4...7
Nominal input current Voltage 5VDC mA 300
Power dissipated When all relays are ON W 3.6
Protection Against reverse polarity   None

 Relay output:

Type     12V-T73-USB
Relay type     T73
Relay outputs count     4
Contact type     NO, NC
Current consumption 5VDC mA 30
Switching parameters
125 VAC / 28 VDC
250 VAC



  • When the board is connected to the PC and the PC is restarted, the relays will be toggled several times. This is because of the structure of the FTDI chip.
  • The device must be supplied with 5 VDC or order to work.
  • There is no protection against reversed voltage! If the VCC(+5V) and GND are reversed the board will be damaged!
  • The board can not work without computer

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