Time Delay Relays
Dedicated - Percentage
PTHF4900DK
Description
The PTHF4900DK 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. The PTHF4900DK 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.
Wiring Diagram
L1
N/L2
Features & Benefits
FEATURES
Microcontroller based
V = Voltage
L = Load
S1 = Optional
Low Current
Initiate Switch
T1 = ON Time
T2 = OFF Time
R
T
= 100 KΩ
R
T
is used when external
adjustment is ordered.
BENEFITS
Repeat accuracy + / -0.5%,
Factory calibration + / - 5%
Accurate control over a wide factory fixed
cycle period
Allows flexiblility for OEM applications and reduces
component and labor costs
Allows direct operation of motors, lamps, and
heaters without a contactor
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Facilitates heat transfer in high current applications
ON/OFF recycling
percentange control
1 to 99%
Compact, low
cost design
High load currents up
to 20A, 200A inrush
Totally solid state
and encapsulated
Metalized
mounting surface
Accessories
P1004-95, P1004-95-X Versa-Pot
Panel mountable, industrial potentiometer
recommended for remote time delay adjustment.
P0700-7 Versa-Knob
Designed for 0.25 in (6.35 mm) shaft of
Versa-Pot. Semi-gloss industrial black finish.
P1015-13
(AWG 10/12),
P1015-64
(AWG 14/16)
Female Quick Connect
These 0.25 in. (6.35 mm) female terminals are
constructed with an insulator barrel to provide
strain relief.
P1015-18 Quick Connect to Screw Adapter
Screw adapter terminal designed for use with
all modules with 0.25 in. (6.35 mm) male quick
connect terminals.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/pthf4900dk
Rev: 1-A-062216
Time Delay Relays
Dedicated - Percentage
PTHF4900DK
Specifications
Time Delay
Type
Range/External
Adjustment Resistance
Cycle Period
Repeat Accuracy
Cycle Period Tolerance
(Factory Calibration)
Reset Time
Time Delay vs Temp.
& Voltage
Input
Voltage
Tolerance
AC Line Frequency
Power Consumption
Output
Type
Maximum Load Currents
Voltage Drop
OFF State Leakage Current
Protection
Circuitry
Dielectric Breakdown
Insulation Resistance
External or onboard knob
Adjustable from 1 - 99% / R T = 100 KΩ
Fixed from 10s - 1000m
±0.5% or 20ms, whichever is greater
≤ ± 5%
≤ 150ms
≤ ±10%
120 or 230VAC
±20%
50/60 Hz
≤ 2VA
Solid state
Steady State
Inrush*
1A
10A
≅
2.5V at rated current
≅
5mA @ 230VAC
Encapsulated
≥ 2000V RMS terminals to mounting surface
≥ 100 MΩ
Mechanical
Mounting *
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Humidity
Surface mount with one #10 (M5 x 0.8) screw
H
50.8 mm (2”);
W
50.8 mm (2”);
D
38.4 mm (1.51”)
0.25 in. (6.35 mm) male quick connect terminals
-40° to 60°C / -40° to 85°C
95% relative, non-condensing
6, 10, 20A units:
≅
3.9 oz (111 g)
*Units rated ≥ 6A must be bolted to a metal surface using the included heat sink compound. The
maximum mounting surface temperature is 90°C. Inrush: Non-repetitive for 16ms.
Function Diagram
PERCENTAGE
CP
L
CP
CP
V = Input Voltage
CP = Cycle Period
L = Load
T1 = ON Time
T2 = OFF Time
R = Reset
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/pthf4900dk
Rev: 1-A-062216
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