MASSO Documentation

MASSO Relay Module

MASSO 6 relay module provides optical isolation to high voltage/current signals from MASSO controller.


  • Multi color LED's for each relay helps easily troubleshoot issues.
  • Green color LED indicates that a signal is received to switch on the relay and the relay has been switched on.
  • Red color LED indicates that a signal to switch on the relay has been received but the relay has failed and not working. 
  • Each relay can be used to control 5 Amp 28VDC or 5 Amp 240VAC load.
  • Works with a single 24VDC power supply.
  • Board dimensions: 95mm (3.74 inch) x 25mm (0.98 inch)


CAUTION: Connecting the power polarity in reverse will damage the relay module.


INFORMATION: Ordering MASSO relay module CLICK HERE







Green LED indicating relay ON




Red LED indicating relay failed


Wiring example



Mounting and Mechanical Data