The Single Relay Board can be used to turn lights, fans and other devices on/off while keeping them isolated from your microcontroller. You can control high-power devices (up to 10A) via the on-board relay. Control of the relay is provided via a 3-pin header — friendly with servo cables and convenient to connect to many development boards. You cannot use the 5V from the USB to power up the transistor and the LOAD because the USB port usually delivers only 100mA, and this is not enough to switch the relay and the LOAD. That is why you must use an external power supply (Vcc) that is between 7 to 12 volts to power up the Arduino board and the transistor + relay. HRS4(H) Relay 1.COIL DA TA 1-1.Nominal V oltage 1-2.Coil Resistance 1-3.Operate V oltage 1-4.Release V oltage 1-5.Nominal Power Consumption 3 to 48VDC

JQC-3F(T73) 5V PCB Relay - Ciseco PLC. Jqc-3f t73 relay datasheet application note - Datasheet Archive. JQC-3FC Datasheet(PDF) - DB Lectro Inc - ALLDATASHEET.ES. JQC-3F - Datasheet Catalog. Relay only works if coil pin is connected directly to the Arduino. JQC-3FC/T73 model 12VDC PCB MOUNTED SUGAR CUBE RELAY. JQC-3FC/ T73 12VDC. 5V – 12 V TTL control signal Maximum AC current and voltage : 10A 250VAC Maximum DC current and voltage : 10A 30VDC The control signal DC or AC, 220V AC load can be controlled There is a normally open and one normally closed contact To make the coil of relay energized you must need to have an input of 1 in the signal pin.