Modules And Accessories
3.71
Switching Inductive AC Loads
Figure 3. 42 -AC Loads Switching
TRIAC Zero Crossing Switching
1/2 Cycle
Figure 3. 43 - Zero Crossing TRIAC Switching
The Triac output switches the load On or Off only when the AC cycle crosses zero to ensure that
there are no surges or noise due to switching of inductive loads. Therefore there may always be a
delay of up to 1/2-cycle in switching waiting for the zero crossing.
Triacs need a minimum current to remain on. For very low power lamps a shunt may be needed.
10B
2B
N
L
Figure 3. 44 – Lamp Switching
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