© 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

RT 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