Time Delay Relays
Dedicated - Delay-on-Make
ERDM SERIES
Description
The ERDM Series is a combination of digital electronics and
a reliable electromechanical relay. These devices offer a DPDT
relay output for relay logic circuits, and isolation of input to
output voltages. Cost effective for OEM applications, such as
random starting, sequencing ON, switch de-bouncing, anti-short
cycling, and other common delay-on-make applications.
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 energizes and remains
energized until input voltage is removed.
Reset:
Removing input voltage resets the time delay and output.
Features & Benefits
FEATURES
BENEFITS
Repeat Accuracy + / - 0.5%
Allows control of loads for AC or DC voltages
Protects against shock, vibration, and humidity
Wiring Diagram
L1
N/L2
Digital integrated
circuitry with
electromechanical relay
Isolated 10A, DPDT
output contacts
Encapsulated
V = Voltage
A knob, or terminals 9 & 10
are only included on
adjustable units. Relay
contacts are isolated.
R
T
is used when external
adjustment is ordered.
Accessories
P1004-16, P1004-16-XVersa-Pot
Panel mountable, industrial potentiometer
recommended for remote time delay adjustment.
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.
Ordering Information
MODEL
INPUT VOLTAGE
ADJUSTMENT
TIME DELAY
MODEL
INPUT VOLTAGE
ADJUSTMENT
TIME DELAY
ERDM123
ERDM126
ERDM128
ERDM222
ERDM4130S
ERDM4210
12VDC
12VDC
12VDC
24VAC
120VAC
120VAC
Onboard knob
Onboard knob
Onboard knob
Onboard knob
Fixed
Onboard knob
0.1 - 10s
0.6 - 60s
0.1 - 10m
0.1 - 5s
30s
1 - 100m
ERDM422
ERDM423
ERDM425
ERDM427
ERDM429
120VAC
120VAC
120VAC
120VAC
120VAC
Onboard knob
Onboard knob
Onboard knob
Onboard knob
Onboard knob
0.1 - 5s
0.1 - 10s
0.3 - 30s
0.1 - 5m
0.2 - 15m
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/erdm
Rev: 1-A-062216
Time Delay Relays
Dedicated - Delay-on-Make
ERDM SERIES
Specifications
Time Delay
Type
Range
Digital integrated circuitry
0.1s - 500m in 11 adjustable ranges or
0.1s - 1000m fixed
Fixed, onboard or external adjust
±0.5%
≤ ±10%
≤ 150ms
≤ ±2%
12, 24, or 120VDC; 24, 120, or 230VAC
-15% - 20%
-20% - 10%
50/60 Hz
Isolated relay contacts
DPDT
10A resistive @ 120/240VAC & 28VDC;
1/3 hp @ 120/240VAC
Mechanical - 1 x 10
7
; Full Load - 1 x 10
6
≥1500V RMS input to output
≥100 MΩ
DC units are reverse polarity protected
Surface mount with two #6
(M3.5 x 0.6) screws
H
88.9 mm (3.5”);
W
63.5 mm (2.5”);
D
43.2 mm (1.7”)
0.25 in. (6.35 mm) male quick connect terminals
Selection Guides
Adjustment
Repeat Accuracy
Tolerance
(Factory Calibration)
Recycle Time
Time Delay vs Temp.
& Voltage
Input
Voltage
Tolerance
12VDC & 24VDC/AC
120VAC/DC & 230VAC
AC Line Frequency
Output
Type
Form
Rating
Life
Protection
Isolation Voltage
Insulation Resistance
Polarity
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Weight
Function Diagram
DELAY-ON-MAKE (ON-DELAY)
-40° to 65°C / -40° to 85°C
≅
5.7 oz (162 g)
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/erdm
Rev: 1-A-062216