SSAC Relays, THD7 Series
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SSAC Relays, THD7 Series
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Product Details


Relays, THD7 Series
Item #
Time Delay Relay

THD7 Series Information

  • Solid‑State Relay and Timer Combined
  • Two Terminal Series Connection to Load
  • Up to 20A Steady State, 200A Inrush
  • Fixed or Adjustable Delays from 1s‑1000m
  • ±0.5% Repeat Accuracy
The THD7 utilizes only two terminals connected in series with the load. Interval timing mode is achieved by using a small portion of the AC sine wave allowing sufficient voltage for circuit operation. The THD7 can be used for interval or delay‑on‑break timing. It is designed to operate large loads directly, such as motors, heater elements, and motor starters.

Operation (Interval): Upon application of input voltage, the output energizes and the time delay begins. The output remains energized throughout the time delay. At the end of the time delay the output de‑energizes and remains de‑energized until power is removed. Reset: Removing input voltage resets the time delay an the output.

Operation (Delay‑on‑Break): Upon closure of SW1, the load energizes and the timer is reset (zero voltage across its input terminals). Opening SW1 re‑applies input voltage to the timer, the load remains energized and the time delay begins. At the end of the time delay the output de‑energizes. If SW1 is open when power is applied, the load will energize for the time delay then de‑energize. Reset: Reclosing SW1 resets the timer.


Manufacturer Part NumberTHD7624A
Item NumberTHD7624A
Product SeriesTHD7
Family SeriesSSAC Relays, THD7 Series
Mode of OperationInterval, Off Delay
Mounting TypeSurface
Time Range AdjustmentRemote
Timing Range1
Max Time100 Min
Time Tolerance10 %
Time Range (Minutes)0-2, 0-3, 0-5, 0-10, 0-15, 0-30, 0-60, 0-100
Time Range (Hours)0-1
Coil Voltage230 VAC
Nominal Coil Voltage240 VAC
Contact Rating (A)6 A
Termination0.250 in Flat Blade
ApprovalsCE, CSA, UL
Net Weight0.2438 lbs
Gross Weight0 lbs
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