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SeRiusRod

Member
Joined
Jul 4, 2020
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55
So today I made a visit someone nearby that supposedly was selling industrial wiring channels, but then hebrought out a lot more things.
He had boxes of things I couldn't identify or know if they where useful for my project. Solar setup & powerwalls.
I took some pictures:


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A 24v contactor


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230v contactor


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Electric motor protection, he said


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I can't remember


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He also had plenty of breakers, wire fittings/connectors (??).... but what took my attentions where those four electrical cabinets. I've already prepared one for pickup and I'll put the inverter+regulators+breaker panels in there.
Does those pictures mean anything to you. It would be nice to rebuild my implementation of "washing+drying machines/kitchen/dishwasher only live when needed" for that I would need 3-4 contactors.

And also he had some switches that I don't know if they would do as battery disconnectors.

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They all seem to me step motor breakers and contactors and don't know if can be used for normal home AC.
 

Korishan

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Jan 7, 2017
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6,835
Contactors are always nice to have. You can still use the 24V ones, just need a buck converter to run them, unless they are 24VAC, then use a 24VAC tranformer.
 

daromer

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Oct 8, 2016
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5,662
Alot of nice stuff. If you get it for free :D

You can basically find such gear on the scrap nowadays but they are for sure gold for those needing it.

beware of and look at the ratings before using!
 

SeRiusRod

Member
Joined
Jul 4, 2020
Messages
55
But is it safe to run step motor contactors as household kitchen contactors, for example?
I'm reading the specs, but I don't see it clear. Always talking of high voltages and HPs. 3Kw is the bigger I've read in those stickers. And for an oven I would run something bigger, like 5kw min.

I found the switches to else be step motor switches. One on every battery bank would have been nice.:cry:

Free... nah! he wants 5-10 ea.
 

Korishan

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Jan 7, 2017
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A contactor is a contactor, regardless if it's for AC appliances, or was used for a motor. AC is AC as far as that is concerned. So even if these were used to control a motor, they'd be fine for your application, or at least chunks of it.

These would possibly be great for making an ATS, similar to how daromer did his (he has videos on it) and power is auto switched from mains to inverter and back when needed (ie, like when batteries get low you auto switch to grid).
 

SeRiusRod

Member
Joined
Jul 4, 2020
Messages
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Interesting. What is an ATS? :)


Ah, I see, an automatic transfer switch. But I don't know if it's really needed.
I have a victron unit waiting. It's an ups unit on steroids and it has a relay port for switching a generator. There I would have to wire the contactor for the company supply.
What I don't like on the victron is charging from the grid. I want to eliminate this.
 

Korishan

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Then for 'this' particular application, you don't need the ATS function. However, you could still use the contactors for emergency disconnect of the DC side. Nevermind, those contactors are AC only, not DC rated. They are designed for disconnected AC under heavy amp loads safely.
 

SeRiusRod

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Jul 4, 2020
Messages
55
Ummm... Those are three phase contactors rated at 9amps read anywhere.
Question: if I was to only switch phase, and wire the the same phase to all three ports... That would increase the rated amps and make it work as 20A?

:D :D :D


Have you seen those gauges? They are slick. If only they weren't rated at those huge values I would be tempted to put some on that box door
 

Korishan

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Jan 7, 2017
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Well, take a regular relay and try tripping it on/off with 9A load on it. See how long it lasts ;)

400V @ 9A = 3600W


Yeah, I "think" you can parallel the input with the same phase.
 

Jim Jr.

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Joined
Jun 3, 2018
Messages
65
Using a 3 phase contactor will work for a while, but each leg , with rest of the connections on the inside are rated for 9 amps each.

If one of the contact points fails, the other two will over heat and possible melt the plastic housing , leading to catastrophic failure of

contactor . I would only use one and have two spares connections


JimJr.
 
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