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FAQ02083 of Solid-state Relays FAQ

FAQ No. FAQ02083

Primary Contents

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 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.

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