FAQ No. FAQ02083
Question
What is the zero cross function?
Answer
The zero cross function causes the Relay to turn ON when the AC load power
supply approaches 0 V to suppress noise generated when the load current
rises suddenly.
There are two types of noise: noise on power lines and noise emitted into
open spaces. The zero cross function is effective against both types of
noise.
A very large inrush current flows when lamps and similar equipment are
turned ON, but the zero cross function causes the load current to always
flow from a point near zero so that inrush current can be suppressed more
compared to Solid-state Relays (SSRs) that do not have the zero cross
function.
Ideally, the function turns ON near 0 V, but restrictions in the circuit
configuration cause it to operate within the range of 0 V ±20 V. This
voltage is called zero cross voltage.
Other Solid-state Relay
FAQs
 What is a snubber circuit?
Is it abnormal that the SSR is so hot that I can’t continue touching it?
Can the output sides of SSRs be connected in parallel?
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