Contactor that doesn't hum?

[jaggedben]

Looking for advice...

I have a residential application with a 20A contactor that hums when it's energized/closed. This particular client is very sensitive to the hum and I'm hoping to find a replacement. The contactor is an Eaton C25BNB220T. I need to use 24V for the coil voltage.

Any advice regarding different brands or types of contactors that would not hum would be appreciated.

 

[Besoeker3]

Looking for advice...

I have a residential application with a 20A contactor that hums when it's energized/closed. This particular client is very sensitive to the hum and I'm hoping to find a replacement. The contactor is an Eaton C25BNB220T. I need to use 24V for the coil voltage.

Any advice regarding different brands or types of contactors that would not hum would be appreciated.

One way would be using a DC coil.

 

[petersonra]

Looking for advice...

I have a residential application with a 20A contactor that hums when it's energized/closed. This particular client is very sensitive to the hum and I'm hoping to find a replacement. The contactor is an Eaton C25BNB220T. I need to use 24V for the coil voltage.

Any advice regarding different brands or types of contactors that would not hum would be appreciated.

Have you tried a different one of the same style? We use tens of thousands of Siemens IEC contactors and I've never heard any of them hum.

 

[infinity]

Use a latching relay.

 

[Terminator5047]

Looking for advice...

I have a residential application with a 20A contactor that hums when it's energized/closed. This particular client is very sensitive to the hum and I'm hoping to find a replacement. The contactor is an Eaton C25BNB220T. I need to use 24V for the coil voltage.

Any advice regarding different brands or types of contactors that would not hum would be appreciated.

Use a RIB

 

[jaggedben]

One way would be using a DC coil.

Hmm, that might be an option.

 

[jaggedben]

Use a RIB

What's that?

 

[Besoeker3]

Hmm, that might be an option.

I've done it a fair few times.

 

[jaggedben]

Use a latching relay.

I think I need some education on this. I only have one control circuit and when that circuit is opened I need the contactor to open. I see latching relays with 'latch' and 'unlatch' on the wiring diagrams. I cannot be dependent on a second circuit to unlatch the relay, but is there a type that unlatches itself? What terminology should I be using to filter google results?

 

[jaggedben]

I've done it a fair few times.

I understand how it's doable. It would mean adding or changing out more components so it's not exactly my first choice.

 

[don_resqcapt19]

Is this a brand new contactor? If not, see if there is rust or dirt on the mating faces of the laminations.

 

[Terminator5047]

What's that?

Relay in a box they are small made by functional devices in many different amperages and configurations

 

[Besoeker3]

I understand how it's doable. It would mean adding or changing out more components so it's not exactly my first choice.

That's fair enough.

There's more than one way to skin a cat

 

[jaggedben]

Is this a brand new contactor? If not, see if there is rust or dirt on the mating faces of the laminations.

Yes, brand new and multiple instances of same making the same hum. Just this one client so far for whom it's an issue.

 

[augie47]

I can't recall the details, but I have installed latching contactors that can be wired to operate on a two wire control.

Edit: see here:

https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/c30cn-mechanically-held-lighting-contactors/2-and-3-wire-control-for-c30cnm-mechanically-held-30a-lighting-contractors-AP03702001E.pdf

 

[hillbilly1]

I can't recall the details, but I have installed latching contactors that can be wired to operate on a two wire control.

Edit: see here:

https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/c30cn-mechanically-held-lighting-contactors/2-and-3-wire-control-for-c30cnm-mechanically-held-30a-lighting-contractors-AP03702001E.pdf

GE has one too, but requires a 24 hour hot for the control to work.

 

[hillbilly1]

Is this a brand new contactor? If not, see if there is rust or dirt on the mating faces of the laminations.

I agree, usually contaminated by sheet rock or concrete dust from drilling through the enclosure without removing the contactor or not marking and drilling like it should have been done.

 

[infinity]

I can't recall the details, but I have installed latching contactors that can be wired to operate on a two wire control.

Edit: see here:

https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/c30cn-mechanically-held-lighting-contactors/2-and-3-wire-control-for-c30cnm-mechanically-held-30a-lighting-contractors-AP03702001E.pdf

Exactly. ASCO also has an accessory (#47) for their mechanical latching contactors that allow for 2-wire control.

 

[hillbilly1]

Everybody puts their name on that contactor, Eaton, GE, Square D, I believe Asco is the actual manufacturer. The nice thing about them, is the contacts are field convertible from N/O to N/C by simply moving the contact block. The only other manufacturer I know of, that can do the same is Square D’s LX series, but theirs is a lot harder to configure.

 

[LarryFine]

You guys like to work too hard. Just use an HVAC solid-state relay.