FS491 - Flasher and Tower Lighting Controls Series

Series: FS400
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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 FS400 Series is a low leakage AC flasher designed to control LED, or resistive loads. This series offers a solid state output and may be ordered with an input voltage of 24 V to 240 V AC, in two ranges. It offers a factory fixed flash rate of 75 flashes per minute or may be ordered with a fixed custom flash rate ranging from 45 to 150 flashes per minute. The FS400 is the perfect solution for LED lamp flashing.OperationUpon application of input voltage, the output energizes and the ON time begins. At the end of the ON time, the output de-energizes and the 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 the flash sequence.
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Product Literature


Property (Mouseover for details) Value
Input Voltage (V) 120 - 240 V ac
Input Tolerance (%) ±15%
Input AC Line Frequency (Hz) 50/60
Humidity 95% relative non-condensing
Output Voltage Drop (V) 2
Output Load Type LED or resistive
Output Form Bridge rectifier – FET
Output Load Rating (VA) 0.5 A maximum load rating steady state
Flash Rate (fpm) Fixed at 75 ±20%
On/Off Ratio (%) ≌50%
Circuitry Encapsulated
Inush 5
Open State Leakage Current (A) 250
Surge Protection IEEE C62.41 - 1991 Level A
Operating Temperature -20° to 60°C (-4° to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40° to 185°F)
Mounting Method Surface mount with one #10 (M5 x 0.8) screw
Dimensions 1.5 H x 0.94 W in. (38.1 x 23.9 mm)
Weight (lbs/g) 0 Kg
To request product environmental information, please complete the Product Environmental Information Request Form.