Description of product


A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.

The module is triggered, high trigger current less than 5mA, part of the 51 single-chip IO port output capability is weak, pull or increase the drive capability of the circuit.


  • 5V relay
  • can be used as a microcontroller development board module can be used as a home appliance control
  • 5 V-5v TTL control signals
  • control DC or AC signal can control the 220V AC load.
  • a normally open and one normally closed contact
  • a power indicator
  • control light, bright pull, disconnect does not shine
  • the increase in transistor drive a relay coil, control pins high impedance.
  • the control pins with pull-down circuit, prevent floating relay malfunction
  • high quality, pin colors (black, yellow) were shipped.
  • blue KF301 terminal control measure and easy to wire
  • 4 positioning screw hole diameter 3mm center hole spacing of 20mm x 40mm
  • compact circuit board