Immersion & General Purpose Timeswitches

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NTTHDS 20A 24 Hour/7 Day Compact Digital Heavy Duty Timeswitch

Timeguards heavy-duty timer range allows for a higher standard of flexibility with your installation. From supporting heavier loads of lighting, heating and other electrical appliances. Our heavy-duty models now include a loop function, allowing for continuous ON/OFF schedules for the supply to be fed to your appliance, regulating how long mains should be supplied, before disconnecting the load for a predetermined amount of time and repeating this action indefinitely. This feature is great for pumps providing routine circulation without fear of overheating, charging cycles for appliances utilising a battery backup power supply to save energy and simply for allowing intervals on your circuit. The NTTHD series is available in surface, patress and OEM module form factors to support a no-compromise "fit for purpose" installation.

  • Voltage free change over contacts.
  • Programme suspension, loop and override to next programme function.
  • 8 ON/8 OFF easy-set programmes per day. 56 ON, 56 OFF per week.
  • Automatic Summer/ Winter changeover.
  • Extra large “Easy View” backlit display with protective cover).
  • Backup battery power reserve.
  • Self cancelling override & boost options.
  • Red LED “Mains ON” & Green LED “Output” indicators for easy viewing.


Operating Voltage 230V AC
Frequency 50Hz
Earth Class Rating Class I
Operating Temperature 0°C to 40°C
Voltage Free Contacts Normally Open, Normally Closed (Changeover)
Mounting Hole Centres (mm) 95
Standby Consumption <1W
Dimensions Height 120mm, Width 74mm, Depth 53mm
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