© 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062216
Time Delay Relays
Dedicated - Delay-on-Make
www.littelfuse.com/erdm
ERDM SERIES
L1 N/L2
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.
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
Digital integrated
circuitry with
electromechanical relay
Repeat Accuracy + / - 0.5%
Isolated 10A, DPDT
output contacts
Allows control of loads for AC or DC voltages
Encapsulated Protects against shock, vibration, and humidity
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.
Wiring Diagram
Ordering Information
MODEL INPUT VOLTAGE ADJUSTMENT TIME DELAY MODEL INPUT VOLTAGE ADJUSTMENT TIME DELAY
ERDM123 12VDC Onboard knob 0.1 - 10s ERDM422 120VAC Onboard knob 0.1 - 5s
ERDM126 12VDC Onboard knob 0.6 - 60s ERDM423 120VAC Onboard knob 0.1 - 10s
ERDM128 12VDC Onboard knob 0.1 - 10m ERDM425 120VAC Onboard knob 0.3 - 30s
ERDM222 24VAC Onboard knob 0.1 - 5s ERDM427 120VAC Onboard knob 0.1 - 5m
ERDM4130S 120VAC Fixed 30s ERDM429 120VAC Onboard knob 0.2 - 15m
ERDM4210 120VAC Onboard knob 1 - 100m
If you don’t find the part you need, call us for a custom product 800-843-8848
