Taiss Universal Changeover Switch 20A 550V 4 Position 8 Terminal Ratchet Rotary Cam Selector Switch + SV2-4s Blue Connection Terminal LW26-20 0-4/2

Important to Note: Terminals 2 & 4 are tied together, internally, and Term's 6 & 8 are tied together, internally. The diagram shows this as "1 Phase" and "2 Phase". These connections cannot be removed. There is also a supplied (removable) jumper, installed between Term's 4 & 6, which effectively ties all the even-numbered terminals together. If using a "common" supply (e.g., one input, with four selectable outputs), then leave the jumper in (between 4 & 6) and supply any one of the EVEN side terminals with your "common" supply power. Then the ODD numbered terminals will be switched ON in sequence, as the switch is rotated, as follows: Position 0 (zero) everything is OFF. Position 1: turns on terminal #1 only. Position 2: turns on Term. #3 only, #1 goes OFF. Position 3: turns on Term. #5 only, #3 goes OFF. Position 4: turns on Term. #7 only, #5 goes OFF. In addition, all of the contacts are "Break before Make", so there is "overlap" of the outputs (one turns OFF before the next turns ON). This is a decent rotary switch. It rotates easily without much force, but has good, firm detents in each position. The handle/knob is decently sized, and is easy to operate. I used the 4-position/8-contact unit, along with the small "Baomain" matching enclosure (sold separately, also on Amazon) as the selector switch for a remote, multi-port RF amplifier selector box. It operates remote relays that switch between 1 of 4 different radio amplifiers, using a 12-volts DC supply. Works very well.

If you really need to switch 4 pairs of contacts, this isn't for you. The switch I received has 4 of the contacts common, and simply switches continuity to each of the other 4 contacts individually one at a time (or to none at all, at 0). This works fine for me, and saves me the step of jumpering all the commons (I'm switching one common line among 4 potential outputs). The other issue is that the screw that holds the knob to the selector shaft is comically short. In a piece of notebook paper it might get enough purchase to hold, but in an 1/8" panel it barely bites and mounted in a piece of 1/4" ABS it can't even feel the female threads of the shaft. So I'm going to have to order this tiny silly metric screw from McMaster. Other than those issues, it seems well made and is working fine so far.

Good quality work great

I used to build a fan from my air conditioner air handler fan and motor. Worked great.

The instructions are a little confusing, but other reviewers had already figured it out and were able to point me in the right direction. Out of the box it has a jumper between 4 & 6, this effectively ties 2, 4, 6, & 8 together. I connected the "Hot" to just one of those terminals. Then connected the 4 speed wires coming from the motor to 1 (low), 3 (medium low), 5 (medium high), and 7 (high). Neutral goes to the white wire on my motor. The switch itself seems to be fairly robust. Switching between stops has a nice positive click and turns very smoothly and easily.