FLASHERS
Type of Load
Variable vs. Exact:
• Variable load flashers will handle a range of lamps as needed up to the total specified.
• Exact load flashers will flash only the number of lamps for which it is rated. These are typically for OEM
replacement applications.
Lamp Capacity
The total number of lamps energized in the circuit.
Terminal Count
Two or three terminals — always match the terminal configuration being replaced.
Design
Thermal vs. Electronic:
• Thermal (Bi-Metal) flashers are a mechanical device that operate through the heating and cooling of a
bi-metal strip, opening and closing the contacts, causing the lamps to “flash”.
• Electronic flashers are comprised of an electro-mechanical relay with an opposing A and B coil. A
capacitor prevents one coil from pulling in relay contacts until it is fully charged. The charging and dis-
charging of the capacitor along with a resistor determine the flash rate and set duty cycle (on/off time).
In some cases you can replace a Thermal Flasher with an Electronic Flasher but never replace an
Electronic Flasher with a Thermal Flasher.
THERMAL FLASHERS
Universal Variable For Domestic Cars
• Universal design replaces most popular part numbers 536 and 552.
• Replaces 12-volt, two terminal flashers.
• Capacity
– Turn Signals: Flashes two to three 32 C.P. standard or long-life lamps.
– Hazard Warning: Flashes two to six lamps.
• Features durable, heavy duty thermal flashing mechanism for increased reliability.
• Quality construction ensures continued operation even under harsh temperature and
humidity environmental factors.
18 FLASHERS
Littelfuse Flashers meet D.O.T., S.A.E. and all applicable state and federal requirements.
Bulk
Part No.
FLR 536/552
US
Carded No.
FLR 536/552 BP
Canadian
Carded No.
FLR 536/552 CABP
Volts
12
Terminals
2
Lamps
2–6
Variable For Import Cars/Domestic Trucks
• Replaces most 12 volt, three terminal flashers.
• Capacity
– Turn Signals: Flashes two to three 32 C.P. standard or long-life lamps.
– Hazard Warning: Flashes two to six lamps.
• Separate pilot circuit and durable, heavy duty thermal flashing mechanism for
increased reliability.
• Quality construction ensures continued operation even under harsh temperature
and humidity environmental factors.
Bulk
Part No.
FLR 550
US
Carded No.
FLR 550 BP
Canadian
Carded No.
FLR 550 CABP
Volts
12
Terminals
3
Lamps
2–6
Variable For Cars and Light Trucks
• Replaces 12 volt, three terminal flashers.
• Capacity
– Turn Signals: Flashes two to three 32 C.P. standard or long-life lamps.
– Hazard Warning: Flashes two to six lamps.
• Features durable, heavy duty thermal flashing mechanism for increased reliability.
• Quality construction ensures continued operation even under harsh temperature and
humidity environmental factors.
Bulk
Part No.
FLR 569
US
Carded No.
FLR 569 BP
Canadian
Carded No.
FLR 569 CABP
Volts
12
Terminals
3
Lamps
2–6
Pin Configuration Key
-
+
X = Battery L = Lamp P = Pilot Light
