© 2016 Littelfuse Protection Relays & Controls

Time Delay Relays

Dedicated - Interval

www.littelfuse.com/hrdi

Rev: 1-A-062116

HRDI SERIES

Description

The HRDI Series combines an electromechanical relay output

with microcontroller timing circuitry. It offers 12 to 230V

operation in five ranges and factory fixed, external, or onboard

adjustable time delays with a repeat accuracy of ±0.5%. The

output contact rating allows for direct operation of heavy loads,

such as compressors, pumps, blower motors, heaters, etc. This

series is ideal for OEM applications where cost is a factor.

Operation (Interval)

Upon application of input voltage, the time delay begins. The

output relay is energized 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%

Compact, low

cost design

Allows flexiblility for OEM applications

Isolated, 30A, SPDT,

NO output contacts

Allows direct operation of heavy loads:

compressors, pumps, blower moters, heaters.

Encapsulated

Protects against shock, vibration, and humidity.

Accessories

P1004-95, P1004-95-X Versa-Pot

Panel mountable, industrial potentiometer

recommended for remote time delay adjustment.

P1023-6 Mounting bracket

The 90° orientation of mounting slots makes

installation/removal of modules quick and easy.

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.

C103PM (AL) DIN Rail

35 mm aluminum DIN rail available in a 36 in.

(91.4 cm) length.

P1023-20 DIN Rail Adapter

Allows module to be mounted on a 35 mm DIN

type rail with two #10 screws.

L1

N/L2

C = Common,Transfer

Contact

NO = Normally Open

L = Load

NOTE: A knob, or

terminals 4 & 5 are only

included on adjustable

units. RTTis used when

external adjustment is

ordered. Relay contacts

are not isolated.

IntervalTimer

Wiring Diagram

Ordering Information

MODEL

INPUT VOLTAGE

ADJUSTMENT

TIME DELAY

HRDI117S

12VDC

Fixed

7s

HRDI421

120VAC

Onboard

1 - 100s

HRDI422

120VAC

Onboard

10 - 1000s

If you don’t find the part you need, call us for a custom product 800-843-8848