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Working voltage: DC 6-24V;Working current (12V): 1 relay 37mA, 2 relays 73MA;3 relays 110MA;4 relays 146MA;Standby current (12V): 2mA;Load current: 250V/10A AC, 30V/10A DC Module interface: 1.VCC: Positive power supply (VCC) 2. GND: Negative Power Supply (GND) 3. T: low pulse trigger; relay outputs: 1.NO: normal open relay interface 2. COM: common interface relays 3. NC: normally closed relay interface USE 1: By default, the relay is released, press the trigger, pull the relay, press again, release the relay, press the third button, pull the relay and so on. USE 2: By default, the relay is released, the MCU output low (0.3-1 seconds), the relay pull, again low, the relay trigger, the third low, the relay pull, etc. Typical applications: automotive electronics, motor, LED, smart home, emergency lighting, MCU development board