Time Delay Relays
Dedicated - Delay-on-Make
HRDM SERIES
Delay-on-Make Timer
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
Microcontroller based
BENEFITS
Repeat Accuracy + / - 0.5%
Allows flexiblility for OEM applications
Allows direct operation of heavy loads:
compressors, pumps, blower moters, heaters.
Protects against shock, vibration, and humidity
Wiring Diagram
L1
N/L2
Compact, low
cost design
Isolated, 30A, SPDT,
NO output contacts
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.
Encapsulated
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.
Ordering Information
MODEL
INPUT VOLTAGE
ADJUSTMENT
TIME DELAY
HRDM120
HRDM3112S
HRDM413M
HRDM415M
12VDC
24VDC
120VAC
120VAC
Onboard
Fixed
Fixed
Fixed
0.1 - 10s
12s
3m
5m
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.
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/hrdm
Rev: 1-A-062116
Time Delay Relays
Dedicated - Delay-on-Make
HRDM SERIES
External Resistance vs. Time Delay
Specifications
Time Delay
Type
Microcontroller circuitry
Range
0.1s - 100m in 5 adjustable ranges or fixed
Repeat Accuracy
±0.5% or 20 ms, whichever is greater
Tolerance
(Factory Calibration)
±1%, ±5%
Reset Time
≤ 150ms
Time Delay vs Temp.
& Voltage
±2%
Input
Voltage
12 or 24VDC; 24, 120, or 230VAC
Tolerance
12VDC & 24VDC
-15% - 20%
24 to 230VAC
-20% - 10%
AC Line Frequency
50/60 Hz
Power Consumption
AC ≤ 4VA; DC ≤ 2W
Output
Type
Electromechanical relay
Form
Non-isolated, SPDT
Ratings
SPDT-NO
SPDT-NC
General Purpose 125/240VAC
30A
15A
Resistive
125/240VAC
30A
15A
28VDC
20A
10A
Motor Load
125VAC
1 hp*
1/4 hp**
240VAC
2 hp**
1 hp**
6
Life
Mechanical - 1 x 10 ;
Electrical - 1 x 10
5
, *3 x 10
4
, **6,000
Protection
Surge
IEEE C62.41-1991 Level A
Circuitry
Encapsulated
Dielectric Breakdown
≥ 2000V RMS terminals to mounting surface
Insulation Resistance
≥ 100 MΩ
Polarity
DC units are reverse polarity protected
Mechanical
Mounting
Surface mount with one #10 (M5 x 0.8) screw
Dimensions
3 x 2 x 1.5 in. (76.7 x 51.3 x 38.1mm)
Termination
0.25 in. (6.35 mm) male quick connect terminals
Environmental
Operating/Storage
Temperature
-40° to 60°C / -40° to 85°C
Humidity
95% relative, non-condensing
Weight
≅
3.9 oz (111 g)
Function Diagram
DELAY-ON-MAKE (ON-DELAY)
V = Voltage
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
R = Reset
= Undefined
Time
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/hrdm
Rev: 1-A-062116
