KSD3 Series - Recycling Timer

Littelfuse Recycle Time Delay Relays
The KSD3 Series is a cost effective approach for ON/OFF recycling applications. The on time is equal to the off time. An adjustment of the RT will change the time delays of both on and off times. 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 within 5% of the target time delay. The repeat accuracy, under stable conditions, is 0.5% of the selected time delay. This series is designed for popular AC and DC voltages. Time delays of 0.1 seconds to 1000 minutes are available in 6 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 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 the ON time.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample capableCompare
KSD3120A12VDC-40° to 80°C (-40°F to 176°F)No
KSD3310.1SA24VDC-40° to 85°C (-40°F to 185°F)ON time first: 0.1s fixedNo
KSD3415MA120VAC-40° to 80°C (-40°F to 176°F)ON time first: 5m fixedNo
KSD3432A120VAC-40° to 80°C (-40°F to 176°F)ON time first: 10 - 1 000s onboard adjustableNo