KRD3 Series - Recycling Timer

Littelfuse Recycle Time Delay Relays
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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)
Max. Output
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample CapableCompare
KRD3420A120VACSPDT250VAC-40° to 85°C (-40°F to 185°F)0.1 - 10s onboard adjustableNo
KRD3421A120VACSPDT250VAC-40° to 85°C (-40°F to 185°F)1 - 100s onboard adjustableNo
KRD3424A120VACSPDT250VAC-40° to 85°C (-40°F to 185°F)1 - 100m onboard adjustableNo