I have three switches by my kitchen sink. One for the dish washer, one for the sink disposal, and one for the light above the sink. Three separate circuits. I purchased a Leviton 3 toggle switch with one pole on one side and three poles on the other. The sales person said to tie all of the hot wires together to the single pole and the other three wires to the three pole side. When I tied two of the hots together and turned the breaker back on it was like the 4th of July !!! I used a volt meter to isolate the hots from the nots. So I know I followed the advise. The instructions on the box show the hot side going to the single pole but don't mention multiple hot feeds to the single pole. Is the issue that you can't tie different circuit hot sides together ? Is this switch just made to feed three different devices from one circuit ?
Thanks to everyone that replied to my question. Yes.. in retrospect I created a 240v circuit by putting the two 120v circuits together. Should have known better, but the resident expert at my local big box home improvement store told me that was what I needed to do. I realized the switch was probably meant for one single circuit after the sparks. Just wanted verification. Thank you all for your advice.