SSAC Relays, PTHF Series
Toggle Nav

Sign in to see your recent orders, quotes and account activity.

Sign in


SSAC Relays, PTHF Series
In stock
Item Number
MFG Item Number

Order by 5:00 PM ET and your package will ship the same day.
Product Details


Relays, PTHF Series
Item #

PTHF Series Information

  • ON/OFF Recycling Percentage Control
  • Controls Loads up to 20A, 200A Inrush
  • Fixed Cycle Period 10s‑1000m
  • ±0.5% Repeat Accuracy
  • ±5% Factory Calibration
The PTHF Series can be used for a variety of applications from chemical metering, to temperature regulating, to energy management. The infinite adjustability from 1 to 99% provides accurate percentage on control over a wide factory fixed cycle period. When mounted on a metal surface, it can be used to drive solenoids, contactors, relays, or lamps, up to 20A steady, 200A inrush. PTHF is the suggested replacement for the PT Series.

Operation (Percentage): Upon application of input voltage, the output energizes and the T1 ON time begins. At the end of the ON time, the output de‑energizes and the T2 OFF time begins. At the end of the OFF time, the output energizes and the cycle repeats as long as input voltage is applied. Increasing the ON time decreases the OFF time. The total cycle period is equal to the ON time plus the OFF time. The total cycle period is factory fixed. ON time range is 1 to 99 percent of cycle period. Reset: Removing input voltage resets the output and time delays, and returns the sequence to the T1 ON time.

  • Totally Solid State & Encapsulated
  • Onboard or External Adjustment 1‑99% ON


Manufacturer Part NumberPTHF420A-SSAC
Item NumberPTHF420A
Product SeriesPTHF
Family SeriesSSAC Relays, PTHF Series
Mode of OperationPercentage Repeat Cycle
ContactsSolid State
Mounting TypeSurface
Time Range AdjustmentRemote
Timing Range20
Max Time20 s
Time Tolerance5 %
Time Range (Seconds)0-1, 0-2, 0-3, 0-5, 0-10, 0-15
Coil Voltage120 VAC
Nominal Coil Voltage120 VAC
Contact Rating (A)6 A
Termination0.250 in Flat Blade
ApprovalsCE, CSA, cULus, UL
Net Weight0.2438 lbs
Gross Weight0 lbs
© Copyright 2023 Galco Industrial Electronics, All Rights Reserved