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 KRD3 Series measures only 2 in. (50.8 mm) square. Its solid-state timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRD3 Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.


Operation (Recycling Flasher - 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 T1 ON time.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Max. Output
Voltage (V)
Storage Temperature (F/C)Time Delay RangeDimensionsStockCompare
KRD3420A120VACSPDT250VAC-40° to 85°C (-40°F to 185°F)0.1 - 10s onboard adjustable2.00 x 2.00 x 1.21 in. (50.8 x 50.8 x 30.7mm)
KRD3421A120 V acSPDT250-40° to 85°C (-40° to 185°F)1 - 100 s onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)Check
KRD3424A120 V acSPDT250-40° to 85°C (-40° to 185°F)1 - 100 m onboard adjustable2 H x 2 W in. (50.8 x 50.8 mm)Check
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