© 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