has anyone switched 120 Volts (or more) using a k84?

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has anyone switched 120 Volts (or more) using a k84?

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DaleSchultz		#1 Posted : 25 October 2017 23:23:46(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		I believe that the k84 modules can handle a fair amount of current. I am thinking of switching a strobe light that I have that runs on 120V AC using a K84. Has anyone done this or seen it done? (In terms of switching AC power, not the strobe part) I cant put my hand on the strobe unit I have to see what its current draw is.
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Crazy Harry		#2 Posted : 26 October 2017 01:37:59(UTC) Retweet
Joined: 18/11/2008(UTC) Posts: 477 Location: Oakville, Ontario		I wouldn't trust the k84 at the higher voltage, but would consider using an interposing relay: Where "Your Switch" is the k84. Sorry, but I don't have any suggestions on what relay to use. Harold.


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DaleSchultz		#3 Posted : 26 October 2017 18:03:31(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		yes, using a second relay would be called for if the current exceeds the capacity of the k84 relay
		Dale Intellibox + own software, K-Track My current layout: https://cabin-layout.mixmox.com Arrival and Departure signs: https://remotesign.mixmox.com
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Minok		#4 Posted : 27 October 2017 03:39:33(UTC) Retweet
Joined: 15/10/2006(UTC) Posts: 2,311 Location: Washington, Pacific Northwest		I'd not do it. Looking at the documentation for the K84 it unfortunately isn't clear what sort of relay is in the thing. Marklin only says it can "easily switch the entire output from the model railroad transformer". Nice and useless, though one could say you should not exceed the current or voltage outputs possible on said "model railroad transformers". I'd be fairly confident the internal relays are NOT rated for 120VAC, because that requires much better isolation between the leads in the relay and going in and out (and relative to other internal conductors) than one has to worry about at 30VAC.
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3 users liked this useful post by Minok		DaleSchultz, Danlake, Bigdaddynz
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kiwiAlan		#5 Posted : 27 October 2017 15:56:44(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,109 Location: ENGLAND, Didcot		Originally Posted by: Minok I'd not do it. Looking at the documentation for the K84 it unfortunately isn't clear what sort of relay is in the thing. Marklin only says it can "easily switch the entire output from the model railroad transformer". Nice and useless, though one could say you should not exceed the current or voltage outputs possible on said "model railroad transformers". I'd be fairly confident the internal relays are NOT rated for 120VAC, because that requires much better isolation between the leads in the relay and going in and out (and relative to other internal conductors) than one has to worry about at 30VAC. The only way to do it is to use the k84 really to switch the input of a solid state relay that is suitably rated for the 120VAC. The input on an SSR is an LED, so a suitable DC supply voltage and a resistor to limit the LED current is the only other components required. If doing multiple outputs then only one power supply is required (a suitable wall wart would suit). You may not need the resistor per SSR, as I think a lot of those are designed for 12V operation anyway, so just a suitable power supply.


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