120v to 240v Switch Contactor

[radllc]

Any reason not to use this contactor for a simple 120 to 240v element control switch within my 220v PID based controller? Plan is to switch the coil a1/2 with a 10amp rated 22mm selector switch. The In-bound neutral would be tied to R1 and the in-bound non-ssr hot leg of 240v would be tied to 1. R2 and 2 would be tied together as a COM going to the element. In a non-energized coil state (default) it would operate at 120v and 240v in an energized coil state.

The reason I like this option is that it would mount right to the din rail in my controller. Alternatively, I could use a 30amp rated relay with 120v coil, but I prefer this all-in-one option. Thanks.

https://www.amazon.com/gp/product/B0CDFRX6JL/ref=ox_sc_act_title_1?smid=A3HMB6GLG0WJ17&psc=1

 

[doug293cz]

To make it easier for others to follow this discussion, here is the wiring diagram for the contactor linked above:

Your solution to this design requirement is excellent. I have used this relay for the same purpose in some of my designs, but it is not DIN rail mounted.

Brew on

 

[radllc]

To make it easier for others to follow this discussion, here is the wiring diagram for the contactor linked above:

View attachment 859462

Your solution to this design requirement is excellent. I have used this relay for the same purpose in some of my designs, but it is not DIN rail mounted.

Brew on

Appreciate the response, thank you!

 

[Climb]

Since you will be connecting terminals R2 and 2 together, you need to be sure the connection between R1 and R2 opens before the connection between terminals 1 and 2 close; i.e. break before make. Does this contactor do that?

 

[radllc]

Tha

Since you will be connecting terminals R2 and 2 together, you need to be sure the connection between R1 and R2 opens before the connection between terminals 1 and 2 close; i.e. break before make. Does this contactor do that?

That is a great question. I am not sure of the order of operation or if it is simultaneous; but I get your point. I probably should just use a three position switch and two separate contactors - one contactor for 120v, one for 240v, and an off state.

 

[doug293cz]

Most double throw switches, relays and contactors operate as "Break before Make." Any "Make before Break" device would explicitly state that mode of operation.

If you want to test the device, tie 2 & R2 together, connect the hot wire to R1 and connect 1 to a 1A (or less) fast blow fuse, and connect the other end of the fuse to neutral. Activate the contactor, and if the fuse survives, the contactor is Break before Make.

Brew on