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[BoyntonStu]

I need to be able to remotely control a SPST NC switch to OPEN and that will remain  OPEN until it is manually reset.

IOW An OFF pulse switch position will not be reversed if an ON pulse is received.

A mouse trap comes to mind.

Suggestions please.

[Brian H]

Can you use a appliance module. A 120 volt AC relay and a manual reset button or do you want an all in one thing?

You could use an applance module to supply power to a 120 volt AC relay but wire one side of the coil through a set of the relays normally open contacts. The the normally open Reset push button also across the same relay contacts.
If the appliance module is On. 120 volts is available to power the relay but it will not turn On until the reset push button is pushed.
After the relay is On. It stays On through the now closed set of contacts of the relay.
If you turn Off the appliance module the AC is removed and the relay turns Off.
Turning the appliance module back On does not pull in the relay until you again push the reset button.

A second set of relay contacts could be used for anything you want.

[BoyntonStu]

Can you use a appliance module. A 120 volt AC relay and a manual reset button or do you want an all in one thing?

You could use an applance module to supply power to a 120 volt AC relay but wire one side of the coil through a set of the relays normally open contacts. The the normally open Reset push button also across the same relay contacts.
If the appliance module is On. 120 volts is available to power the relay but it will not turn On until the reset push button is pushed.
After the relay is On. It stays On through the now closed set of contacts of the relay.
If you turn Off the appliance module the AC is removed and the relay turns Off.
Turning the appliance module back On does not pull in the relay until you again push the reset button.

A second set of relay contacts could be used for anything you want.

Brian,

Sounds logical and a possible solution.

First, let me modify the requirement:  24 VAC max and low current.

Here's another possibility:

Use a NC magnetic security switch at the bottom of a cylinder with the 24 VAC load current passing through it.

Suspend a magnet over the cylinder with a 24 VAC electromagnet holding it in place.

When you send a signal,  the 24 VAC and the electromagnet are both de-energized and the magnet is released to fall onto the switch.

If another X10 ON signal comes along, the 24 VAC transformer will energize but the load will not have power.

The magnet must be manually lifted away from the magnetic switch to reset the system.

http://www.coolmagnetman.com/magacem.htm

[Brian H]

That could work and an added thing would be. If there was a power loss. It would stay off until reset.

The only thing you may have to think about. Is the magnet. I don't think an AC coil will hold a magnet directly or if it does it could buzz.

[Tuicemen]

BoyntonStu
As I posted in your other thread, it may be worth looking into a portable GFCI.
Some reset to off with a power disruption!
You'll need a 3 prong appliance module to plug it into!
 

[BoyntonStu]

Brian,

 If there was a power loss. It would stay off until reset.  Good point.

OK Here's another way that avoids this problem.

The magnet sits on a trap door on a level shelf.

When a motion activator/solenoid  pushes or pulls the  trap door beneath the magnet, it falls.

Thus, only a positive ON command will activate the magnetic switch OFF state, and it will remain OFF until manually reset.




The only thing you may have to think about. Is the magnet. I don't think an AC coil will hold a magnet directly or if it does it could buzz.


AFAIK All sprinkler coils are 24 VAC and they don't buzz.

Did you visit this magnet link? 

It discusses ac magnets.


http://www.coolmagnetman.com/magacem.htm

[Brian H]

A sprinkler actuator is not holding a magnet. It is pulling a plunger.

Now if you are thinking a 24 Volt AC Solenoid with an integral plunger.
That is different as the plunger is not a magnet but magnetized by the AC through the coil.

A regular magnet will be attracted when the AC is flowing in one direction and repelled when the AC reverses.

In your link. The steal bolt is not magnetic until the AC is applied.

You maybe able to use a 24 volt solenoid to move the trap door holding the magnet.

[BoyntonStu]

Brian,

Good thinking.

Here's another idea:

Place a 1 Amp Buss buss in a holder in series with the load.

Connect a wire to each side of the fuse, add another fuse in series with one wire and plug it into the Appliance Module.

Make sure that no wire is 'hot'.

When the AM is activated, both fuses will (hopefully?) burn out.

[JeffVolp]

It wasn't X10, but I remember a little box with a switch on top.  When you turned it on, the lid oppened, and a little hand popped out to turn the switch back off.

Jeff

[HA Dave]

It wasn't X10, but I remember a little box with a switch on top.  When you turned it on, the lid oppened, and a little hand popped out to turn the switch back off.
Jeff

http://www.grand-illusions.com/toycollection/little_black_box/

Instead of a mechanical switch using magnets and such... might it not be simpler to use a macro. Using AHP and a CM15A create a macro where A1 ON triggers a macro that turns B1 ON. A1 OFF... wouldn't trigger anything. The CM15A would not be set to transceive "B". It would require a user to log-on the PC to "reset" the B1 module... which could control/be an appliance module [powering a 24V transformer].

If triggering the macro requires a "NC magnetic security switch" connect it to a PowerFlash Module. And allow/cause the PowerFlash Module to trigger the macro.

If the purpose of the setup is to tell if someone has passed through a doorway.... a DS7000 could do that. As the DS7000 flashs lights when triggered... it also leaves the lights ON.. until manually (X10 manual) turned OFF.

[Knightrider]

Your local fine woodworking tool shop (rockler) sells magnetic switches that shut down when the power is removed and have to be manually re-set.  They're used as a safety on table saws and the like so a power interruption won't result in a major kick back.

Put one of those in behind an appliance module and create a macro that makes an "on" into an "off".

[dave w]

I need to be able to remotely control a SPST NC switch to OPEN and that will remain  OPEN until it is manually reset.

Can't you just use a DPDT (or 4PDT) relay wired as a latching relay to accomplish this? Or am I missing something here?

[Brian H]

I suggested a 120 volt variation. No reason a 24 volt AC could not be done.

[dave w]

I suggested a 120 volt variation. No reason a 24 volt AC could not be done.

Yep, I see it now. Sorry. So Stu needs to control 24V with a manual reset(?).

[Brian H]

I don't believe the end goal was given yet.