Recycling Timer Series - Recycling Timer

Series: Recycling Timer
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The ESDR Series offers independent time adjustment of both delay periods. Adjustment options include fixed, onboard or external adjust. The ESDR is recommended for air drying, automatic oiling, life testing, chemical metering and automatic duty cycling. This series is designed for general purpose commercial and industrial applications where a small, cost effective, reliable, solid-state timer is required. The factory calibration for fixed time delays is <±5%. The repeat accuracy, under stable conditions, is 0.1% of the selected time delay. This series is designed for input voltages of 12VDC to 230VAC in five ranges. Time delays of 0.1 seconds to 1000 minutes are available in six ranges. The output is rated 1A steady and 10A inrush. The modules are totally solid state and encapsulated to protect the electronic circuitry.


Operation (Recycling - ON Time First)
Upon application of input voltage, the output energizes and the T1, ON time begins. At the end of the ON time, the output de-energizes and the T2, OFF time begins. At the end of the OFF time, the output energizes and the cycle repeats as long as input voltage is applied.
Reset: Removing input voltage resets the output and time delays, and returns the sequence to the first delay.


Operation (Recycling - OFF Time First)
Upon application of input voltage, the T2 OFF time begins. At the end of the OFF time, the output energizes and the T1 ON time begins. At the end of the ON time, the output de-energizes and the cycle repeats as long as input voltage is applied.
Reset: Removing input voltage resets the output and time delays, and returns the sequence to the first delay.

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Storage Temperature (F/C)Time Delay RangeDimensionsStockSamplesCompare
ESDR120A0P12 V dc-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 0.1 - 10 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR120B3P12 V dc-40° to 85°C (-40° to 185°F)ON: 0.1 - 10 s onboard adjustable; OFF time first: 0.1 - 10 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR123B4P12 V dc-40° to 85°C (-40° to 185°F)ON: 0.1 - 10 m onboard adjustable; OFF time first: 1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR125A5P12 V dc-40° to 85°C (-40° to 185°F)ON time first: 10 - 1000 m onboard adjustable; OFF: 10 - 1000 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR221A224 V ac-40° to 85°C (-40° to 185°F)ON time first: 1 - 100 s onboard adjustable; OFF: 10 - 1000 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR320A0P24 V dc-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 0.1 - 10 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR320A3P24 V dc-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 0.1 - 10 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR420A0120 V ac-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 0.1 - 10 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR420A1120 V ac-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR420A4120 V ac-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 s onboard adjustable; OFF: 1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR420B1120 V ac-40° to 85°C (-40° to 185°F)ON: 0.1 - 10 s onboard adjustable; OFF time first: 1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR420B4120 V ac-40° to 85°C (-40° to 185°F)ON: 0.1 - 10 s onboard adjustable; OFF time first: 1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR421A1120 V ac-40° to 85°C (-40° to 185°F)ON time first: 1 - 100 s onboard adjustable; OFF: 1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR421A4120 V ac-40° to 85°C (-40° to 185°F)ON time first: 1 - 100 s onboard adjustable; OFF: 1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR423A3120 V ac-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 m onboard adjustable; OFF: 0.1 - 10 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR423A4120 V ac-40° to 85°C (-40° to 185°F)ON time first: 0.1 - 10 m onboard adjustable; OFF: 1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR424A1120 V ac-40° to 85°C (-40° to 185°F)ON time first: 1 - 100 m onboard adjustable; OFF: 1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
ESDR450A1120 V ac-40° to 85°C (-40° to 185°F)ON time first: 1 - 100 m onboard adjustable; OFF: 1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)CheckOrder
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