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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | SSAC / Littelfuse |
| Manufacturer Product Number | FS491 |
| Description | Flasher; 75 FPM; 120...240V AC; 0.5A; Bridge rectifier and FET; LED and resistive; ON first |
| Datasheet | Download Datasheet |
The Littelfuse SSAC FS491 is a solid-state flasher for 120-240 V AC, with a 0.5 A bridge rectifier and FET output (5 A inrush). It flashes at a fixed 75 flashes per minute (±20%), the standard factory rate. It flashes LED and resistive loads.
Upon application of input voltage the output energizes and the ON time begins; at the end of it the output de-energizes for the OFF time, and the cycle repeats as long as input voltage is applied. Removing input voltage resets the output and the sequence. Low-leakage output for flashing LED lamps.
Sequence: ON first, ≈ 50% on. Supply tolerance: ±15%; 50/60 Hz. Off-state leakage: 250 µA. Voltage drop: 2 V. Surge: IEEE C62.41-1991 Level A. Other fixed rates: 45 to 150 FPM ±20%, to order.
It is surface mounted with one #8 (M4) screw and has wire leads. Dimensions: 0.94" dia. x 1.5" D (23.9 x 38.1 mm). It operates from -20 to +60 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | SSAC / Littelfuse |
| Flash Rate | 75 FPM ±20% |
| Flash Rate Adjustment | Fixed, factory set |
| Flash Sequence | ON first |
| ON/OFF Ratio | ≈ 50% |
| Custom Flash Rates | 45...150 FPM ±20%, to order |
| Input Voltage | 120...240V AC |
| Input Operating Range | ±15%; 50/60 Hz |
| Output Technology | Solid State |
| Output Type | Bridge rectifier and FET |
| Contact Configuration | 1A SPST-NO |
| Load Type | LED and resistive |
| Load Current (A) | 0.5 |
| Maximum Peak Current (A) | 5 |
| Off-State Leakage Current | 250 µA |
| On-State Voltage Drop (V) | 2 |
| Mounting Type | Surface Mount - one #8 (M4) screw |
| Termination Style | Wire leads |
| Dimensions | 0.94" dia. x 1.5" D (23.9 x 38.1 mm) |
| Operating Temperature | -20...+60 °C (-40...+85 °C) |