3units! 1-Channel DC 5V Relay Switch Board Module, for Arduino Rberry Pi PIC ARM

3 units! 5V Relay Module with Optocoupler Low Level Trigger Expansion Board for Arduino – Single Channel These relays work great, genuine work horses, with SMD optocoupler isolation, and very stable performance.    It can be used as a microcontroller development board module, or as home appliance control.    Normally open interface and can be set to high or low triggered by jumper.    Maximum load: AC 250V/10A, DC 30V/10A.    Trigger current: 5mA    Fail safe design, even if the control line is broken, the relay will not operate.    Convenient terminal wiring leads, easy to connect and operate    5V relay module    TTL control signal of 5V-12V    Controls DC or AC signal, and controls 110V or 220V AC load.    There is a normally open and a normally closed contact    With power indicator    The control pin has a pull-down circuit to prevent floating relay from malfunctioning      Specs:    ·       Optocoupler isolation, good anti-interference    ·       Low level pull-in, high-level rel