4 Zone Dry Contact Input Module

The HDL-MSD04.40 is Bus enabled, used for automation, to connect to any door window sensor, PIR, saves energy, supports 4 zones, security, safety, and it can be used for converting basic manual switches into BUS use. Built-in intelligence and delay functions - small in size, which can easily fit behind switch.


  • 4 channels dry contact input
  • 4 channels state indicator output
  • Dimming function
  • Tamper-proof
  • Security warning function (when used with the security module)
  • Switch type: Mechanical switch, Single-On, Single-Off, Single-On/Off, Combination-On, Combination-Off, Combinations, Multi-functional, Parallel switch
  • Control target type: scenes, sequences, universal switches, single channel adjustment, broadcast scene, broadcast channel, curtain control, panel control, GPRS function, fire alarm control and music play functions
  • Bus online upgrade supported


  • Power supply: DC12-30V
  • Bus power consumption: 20mA/DC24V
  • Working temperature: 0°C ~ +36°C
  • Working relative humidity: 20%~90%
  • Storage temperature: -40°C - +55°C
  • Storage relative humidity: 10%~93%
  • Installation: Screw fix installation


45 x 45 x 12 (mm)