The purpose of Zero Crossing is to switch the relay precisely when the voltage is at zero volts.
What is Zero Crossing?
The mains supply is alternating current, from +230 to -230 VAC. The swing from +230 to -230 VAC occurs at a frequency of 50 Hz, i.e. in 20 ms, passing through 0 volts.
Zero crossing delays switching on the load by a few milliseconds (< 10 ms) so that the module’s relay switches exactly when the amplitude of the power supply passes through 0 volts. This has no visible effect on switch-on for the user.
This process helps to limit the formation of electric arcs. This preserves the relay contacts, protecting them from premature wear.
NodOn and Zero Crossing
NodOn has observed the market’s shift towards low-energy lighting.
There are real differences between the products offered by the major brands and so-called “budget” products.
Low-cost, low-energy lighting draws high inrush currents when switched on, generating more electric arcs. This affects the lifespan of the home automation products used to control the lighting.
With this in mind, NodOn is developing its Zigbee range with built-in zero crossing, in order to extend the life of its products and ensure that installations stand the test of time.
Zigbee Lighting Module
As this module is dedicated to lighting, it features Zero Crossing on each of its 2 outputs.
Zigbee Multifunction Module
This module can also be used to control lighting, so it too features Zero Crossing on its output.
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