© 2016 Littelfuse Protection Relays & Controls

Time Delay Relays

Dedicated - Delay-on-Make

www.littelfuse.com/hrdm

Rev: 1-A-062116

HRDM SERIES

L1

N/L2

Delay-on-MakeTimer

Wiring Diagram

NO = Normally Open

L = Load

C = Common,Transfer Contact

NOTE: A knob, or terminals

4 & 5 are only included on

adjustable units. RT is used

when external adjustment is

ordered. Relay contacts are

not isolated.

Ordering Information

MODEL

INPUT VOLTAGE

ADJUSTMENT

TIME DELAY

HRDM120

12VDC

Onboard

0.1 - 10s

HRDM3112S

24VDC

Fixed

12s

HRDM413M

120VAC

Fixed

3m

HRDM415M

120VAC

Fixed

5m

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

Description

The HRDM Series combines an electromechanical relay output

with microcontroller timing circuitry. It offers 12 to 230V

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

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 (Delay-on-Make)

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

output is de-energized before and during the time delay. At the

end of the time delay, the output relay energizes and remains

energized until input voltage is removed.

Reset: Removing input voltage resets the time delay and 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.