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© 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062016 Flashers and T ower Lighting Controls Flashers www.littelfuse.com/fs491 FS491
Description
The FS491 is a low leakage AC flasher designed to control LED, or resistive loads. This product offers a solid-state output and may be ordered with an input voltage of 24V to 240VAC, in two ranges. It offers a factory fixed flash rate of 75 FPM or may be ordered with a fixed, custom flash rate ranging from 45 to 150 FPM. The FS491 is the perfect solution for LED lamp flashing. Operation Upon 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. Features & Benefits FEATURES BENEFITS T otally solid state No moving parts to arc and wear out, up to 100 million operations under typical conditions Fully encapsulated Protects circuitry from shock, vibration and humidity Extremely low leakage current Ideal for use in LED lighting applications Specifications Technical Data Operation ON/OFF solid-state flasher (continuous duty) Flash Rate Fixed at 75 FPM ±20% Custom Flash Rates 45 - 150 FPM ±20% ON/OFF Ratio ≅ 50% Input Voltage 24, or 120 - 240VAC Tolerance ± 15% AC Line Frequency 50/60Hz Output Load Type LED or resistive Output Bridge Rectifier & FET Maximum Load Rating 120VAC to 240VAC 0.5A steady state; 5A inrush Max. Load Leakage Current 250µA Voltage Drop 2V typical Mechanical Mounting Surface mount with one #8 (M4 x 0.7) screw Protection Surge IEEE C62.41 - 1991 Level A Circuitry Encapsulated Environmental Operating/Storage Temperature -20° to 60°C / -40° to 85°C Humidity 95% relative, non-condensing Weight ≅ 1.1 oz (31 g) L1 N/L2 V = Voltage L = Load R = Red Wire B = Black Wire W = White Wire Wiring Diagram Function Diagram FLASHER (ON FIRST) ON time plus OFF time equals one complete flash. V = Voltage R = Reset L = Load T1 = ON Time T2 = OFF Time T1 ≅ T2