© 2016 Littelfuse Protection Relays & Controls
Time Delay Relays
Dedicated - Interval
www.littelfuse.com/thd2
Rev: 1-A-061016
THD2 SERIES
Description
The THD2 Series combines accurate timing circuitry with high
power solid-state switching. It can switch motors, lamps,
and heaters directly without a contactor. You can reduce labor,
component cost, and increase reliability with these small,
easy-to-use, Digi-Power timers.
Operation (Interval)
Upon application of input voltage, the time delay begins. The
output energizes during the time delay. At the end of the time
delay, the output de-energizes and remains de-energized until
input voltage is removed.
Reset: Removing input voltage resets the time delay and
the output.
Features & Benefits
FEATURES BENEFITS
Microcontroller based
Repeat Accuracy + / - 0.5%,
Factory calibration + / - 1%
High load currents up
to 20A, 200A inrush
Allows direct control of motors, lamps and heaters
without a contactor
Totally solid state
and encapsulated
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Metalized
mounting surface
Facilitates heat transfer in high current applications
Compact, low
cost design
Allows flexibility for OEM applications and reduces
labor and components costs
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.
Wiring Diagram
L1 N/L2
V = Voltage
L = Load
S1 = Optional Low Current
Initiate Switch
R
T
is used when external
adjustment is ordered.
Ordering Information
MODEL
OUTPUT
RATING
INPUT
VOLTAGE
ADJUSTMENT TIME DELAY
THD2C420 20A 120VAC External 0.1 - 10s
THD2C423 20A 120VAC External 0.1 - 10m
THD2C433 20A 120VAC Onboard 0.1 - 10m
THD2C620 20A 230VAC External 0.1 - 10s
THD2C633 20A 230VAC Onboard 0.1 - 10m
If you don’t find the part you need, call us for a custom product 800-843-8848
