It is unlikely that actuators would be the only load since smoke detectors and other life safety may be on the same breaker. It is wise to leave spare power available. Always use the run draw. See local codes for allowable loading.

The equation is VA = Volts X Amps.

Wire runs must be large enough gauge or short enough that there is no voltage rop on way to actuators.

**FSLF:** From the data sheets the 24 VAC draws 5.0 VA. It is wise to load a transformer only 75% to ensure good voltage and a longer life.

For a 40VA transformer, 75% = 30VA. Then 30VA/ 5VA = 6 actuators.

For a 100VA transformer, 75VA load = 75VA / 5VA = 15 actuators.

The 120 VAC draws 18 VA according to data sheet.

Using VA = volts X amps, 18 = 120 X amps, or the FSLF120 draws 18/120 = .15A.

Then given a 20A breaker and an allowable load of 75% = 15A, 15A / .15A = 100.

100 actuators could be placed on a 20A breaker.

**FSNF:** From the data sheet, both draw 27VA or the 120V amp draw is .23A. A 20A breaker loaded to 15A can carry 15 / .23 = 65 actuators.

**FSAF:** From the data sheet, the 24V is 10VA and the 120V draw is .1A. So 3 actuators can go onto a 40VA transformer and 150 actuators can go onto a 20A breaker.

**What? How can these numbers be true given the higher draws competitors show?**

Yes, the numbers above are true. At 120V on a 20A breaker:

- FSLF is 100
- FSNF is 65
- FSAF is 150

**Why are there some differences between 24V and 120V among the actuators above?**

The transformer losses vary and are optimized for different voltages. The FSAF is a slower actuator and thus draws a lot less due to gear ratio.