Ac Solid State Relay Circuit Diagram. In this post we learn how to construct a simple solid state relay or an ssr circuit using a triac bjts a zero crossing opto coupler. This relay is placed in between one of the 115 220v ac wires even though it s typical practice to leave the neutral wire the way it is and switch the phase or hot wire.
When a process controller has an ac output or a system generates an ac signal of above 100v ac to signal the load to turn on this device can be used. A bta40 600 and moc3041 are used in this. Only one relay is shown wired.
The ac supply which could be up to grid mains level and the load are connected in series across the two drains of the mosfets.
Your system may come with one or more relays. In this example a two relay box is used as an illustration. Triac is used at the place of coil relay to switch on and off. This diagram shows how to wire the ac solid state relay to your system.
