© 2016 Littelfuse Protection Relays & Controls

Time Delay Relays

Dedicated - Recycle

www.littelfuse.com/esdr

Rev: 1-A-061016

ESDR SERIES

Ordering Information

MODEL

INPUT VOLTAGE

ADJUSTMENT

T1 ON TIME

FIRST DELAY

T2 OFF TIME

SWITCHING MODE

ESDR120A0P

12VDC

Onboard

0.1 - 10s

On time

0.1 - 10s

Positive

ESDR120B3P

12VDC

Onboard

0.1 - 10s

Off time

0.1 - 10m

Positive

ESDR123B4P

12VDC

Onboard

0.1 - 10m

Off time

1 - 100m

Positive

ESDR125A5P

12VDC

Onboard

10 - 1000m

On time

10 - 1000m

Positive

ESDR221A2

24VAC

Onboard

1 - 100s

On time

10 - 1000s

n/a

ESDR320A0P

24VDC

Onboard

0.1 - 10s

On time

0.1 - 10s

Postitive

ESDR320A3P

24VDC

Onboard

0.1 - 10s

On time

0.1 - 10m

Positive

ESDR420A0

120VAC

Onboard

0.1 - 10s

On time

0.1 - 10s

n/a

ESDR420A1

120VAC

Onboard

0.1 - 10s

On time

1 - 100s

n/a

ESDR420A4

120VAC

Onboard

0.1 - 10s

On time

1 - 100m

n/a

ESDR420B1

120VAC

Onboard

0.1 - 10s

Off time

1 - 100s

n/a

ESDR420B4

120VAC

Onboard

0.1 - 10s

Off time

1 - 100m

n/a

ESDR421A1

120VAC

Onboard

1 - 100s

On time

1 - 100s

n/a

ESDR421A4

120VAC

Onboard

1 - 100s

On time

1 - 100m

n/a

ESDR423A3

120VAC

Onboard

0.1 - 10m

On time

0.1 - 10m

n/a

ESDR423A4

120VAC

Onboard

0.1 - 10m

On time

1 - 100m

n/a

ESDR424A1

120VAC

Onboard

1 - 100m

On time

1 - 100s

n/a

ESDR450A1

120VAC

External

0.1 - 10s

On time

1 - 100s

n/a

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

External Resistance vs.Time Delay

This chart applies to externally adjustable part numbers.

The time delay is adjustable over the time delay range selected by varying

the resistance across the RT terminals; as the resistance increases the tie

delay increases.

When selecting an external RT, add the tolerances of the timer and the RT

for the full time range adjustment.

Examples: 1 to 50 S adjustable time delay, select time delay range 1 and

a 50 K ohn RT. For 1 to 100 S use a 100 K ohm RT.

Function Diagrams

RECYCLING (ON FIRST)

V = Voltage

NO = Normally

Open Contact

NC = Normally

Closed Contact

TD1,TD2 =Time Delay

R = Reset

RECYCLE (OFFTIME FIRST)

V = Voltage

NO = Normally

Open Contact

NC = Normally

Closed Contact

TD1,TD2 =Time Delay

R = Reset

V = Voltage

NO = Normally Open

Contact

NC = Normally Closed

Contact

TD1,TD2 =Time Delay

R = Reset