SSR303 is a three-ampere Z-Wave relay switch designed to fit on an industry standard 6-pin wall plate, and is an ideal replacement for traditional wired heating controls.  It is a single-channel switching unit that is well matched for use with combi boilers.

SSR303 is easy to integrate with other devices using the interoperable Z-Wave standard, and is suitable for applications that require low-power remote switching. It has three LEDs that give a clear indication of the switch and network status. Buttons on the front fascia provide local control, with tactile feedback.



  • Boiler switching

    SSR303 is ideal for boiler control when used together with a SRT321 room thermostat. Manual on and off buttons on the front panel provide local override functionality.

  • Key Feature

    • Mains-powered boiler switch
    • Acts a Z-Wave® repeater, to extend range and signal coverage
    • 3-ampere rated
    • Switched live or switched circuit operation
    • Switch status indication
    • Manual on/off operation
    • Specification
    • Electrical

      Control type

      Micro-disconnection, volt-free


      230 V, 50 Hz

      Contact rating

      3(1) A, 230 V


      Case material

      Flame-retardant thermoplastic

      Dimensions (W x H x D)

      86 mm x 86 mm x 36 mm


      Enclosure protection


      Impulse voltage rating

      Cat I 1500 V

      Insulation type

      Double insulated

      Pollution degree


      Operating temperature range

      0 ˚C to +40 ˚C