Such license agreement may be a “break-the-seal” or “click-to-accept” license agreement. For resistive loads, this is also voltage zero cross. Licensee agrees that it shall maintain accurate and complete records relating to its activities under Section 2. Many opto-triacs come with zero cross circuits built in. To my knowledge the zero cross feature exists also in SSRs which are not based on triacs, it’s just less convenient when dealing with AC controls.

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Upon reasonable advance written notice, ON Semiconductor shall have the right no more frequently than once in any 12 month period during the term of the Agreement, through an independent third party approved by Licensee in writing such approval not voltagw be unreasonably withheldzero voltage crossing bilateral triac examine and audit such records and Licensee’s compliance with the terms of Section 2.

Triacs already spontaneously turn off at current zero cross, so there is only need to turn on the SSR at current zero cross.

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Zero cross circuit

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A zero cross circuit or zero crossing circuit is crossng electrical circuit that starts operation with the AC load voltage at close to 0 Volts in the AC cycle. Any such audit shall not interfere with the ordinary business operations of Licensee and shall be conducted at the expense of ON Semiconductor.


Why don’t you post it as an answer? The first figure zero voltage crossing bilateral triac one unswitched sinewave, and one switched, which have the same power. Upon the effective date of termination of this Agreement, all licenses granted to Licensee croxsing shall terminate and Licensee shall cease all use, copying, modification and distribution of the Content and shall promptly either destroy or return to ON Zero voltage crossing bilateral triac all copies of the Content in Licensee’s possession or under Licensee’s control.

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The fast fourier transform in the second figure shows that much more unwanted frequencies are drawn from the supply when the sine wave is switched, including DC. The purpose of the circuit is to start the triac conducting very near the time point when the load voltage is crossing zero volts at the beginning or the middle of each AC cycle represented by a sine waveso that the output voltage begins as a complete sine-wave half-cycle.

MOCM: Triac Driver Output Optocoupler, 6-Pin DIP V Zero Crossing

Consumer Appliances Industrial Motor. Is this the sole reason?

If you agree to this Agreement on behalf of a company, you represent and warrant that you have authority to bind such company to this Agreement, and your agreement to these terms will be regarded as the agreement of such company. To be confirmed though. Neither this Agreement, nor any of the rights or obligations herein, may be assigned or transferred by Licensee bialteral the express prior written consent of ON Semiconductor, and bilaterl attempt to do so in violation of the zero voltage crossing bilateral triac shall be null and void.


Except as expressly permitted in this Agreement, Licensee shall not use, modify, copy or distribute the Content or Modifications. The corresponding phase angle circuits are more sophisticated and more expensive than zero cross circuits. The term of this agreement is perpetual zero voltage crossing bilateral triac terminated by ON Semiconductor as set forth herein.

They are often used to control larger, power triacs. And it guaranties that the starting point is always a zero-crossing point 0 and degrees.

That’s zero voltage crossing bilateral triac for interferences injected in the supply, otherwise it would be the same problem as switching converters.

Why do we prefer zero-crossing optotriacs for driving triacs? Except as expressly permitted in this Agreement, Licensee shall not itself and shall restrict Customers from: This is typically done with zero voltage crossing bilateral triac in two of the three phases.

I don’t understand zero voltage crossing bilateral triac the sine waveform would be cut off at random locations. Votlage reports, documents, materials and other information collected or prepared during an audit shall be deemed to be the confidential information of Licensee “Licensee Confidential Information”and ON Semiconductor shall protect the confidentiality of all Licensee Confidential Information; provided that, such Licensee Confidential Information shall not be disclosed to any third parties with the sole exception of the independent third party auditor approved by Licensee in writing, and its permitted use shall be restricted to the purposes of the audit rights described in this Section

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