So the relay is activated by 24vac, not controlled by the panel. So the relay has 11 pins, you can have 3 different things going through the relay. Once the relay is activated (by the 270-spo) it flips 3 different switches inside of it. I can put 3 different voltages through it without any others affecting it. I can have the panel go through it (24vdc horns) and another input I have 6vdc for the light.