Electrical help needed

[WoodMangler]

Is there such a thing as an '*OR*' mains relay ? I need a relay which will make the output 'live' when either one of two inputs is live.

 

[dzj]

Inputs connected in parallel might work.

 

[WoodMangler]

Inputs connected in parallel might work.

Wouldn't that mean that either input going live would make the other one live as well ? Not what I need, I have to keep them isolated from each other.

 

[dzj]

To what degree isolated? Wouldn't you need 2 separate control circuits for that?

What are you putting together? That might shed some light on the matter.

 

[porker]

No idea what the application is but can you simply use two relays and put the switching contacts in parallel for your load?

 

[flh801978]

There are specialized relays ( pilz) but they are going to be 10-15 times more expensive than 2 single relays

Ian

 

[WoodMangler]

No idea what the application is but can you simply use two relays and put the switching contacts in parallel for your load?

Yes that would do it, I just wondered if there was a device like I describe, really.

 

[mindthatwhatouch]

What sort of switching load and voltage on the relay?
What sort of voltage on the inputs? both same voltage?
Speed/frequency of use, many ways of doing such things.
more info needed.
Take your pick depending on application, electronic controls/transistors, solid state relays, twin coil relays, or use two relays as suggested above.

 

[WoodMangler]

What sort of switching load and voltage on the relay?

250 V - don't know wattage, but a 5A fuse is specified.

What sort of voltage on the inputs? both same voltage?

Both 250 V.

Speed/frequency of use, many ways of doing such things.

Switches<10 times a day. Duration varies with weather/demand for bread

more info needed.

It's a Stanley oil-burner oven. I need to make sure it only turns on when either the controller says it should, or an override switch is operated (for baking) - so it sits across the supply to the Stanley in 'normally off' mode unless one of those inputs is 'on'

Take your pick depending on application, electronic controls/transistors, solid state relays, twin coil relays, or use two relays as suggested above.

Relays make most sense, I just wondered if there was a single twin-solenoid relay which would do the job.

BobU

 

[mindthatwhatouch]

Assuming the original controller etc is operational.

Then this will sort it....

Enjoy the toast :lol:

 

[WoodMangler]

Assuming the original controller etc is operational.
Then this will sort it....

Enjoy the toast :lol:

The existing wiring is considerably more complicated than that - various sensors and solenoids re-routing water all over the place, and there are already two relays in there, not sure what they're doing though. I think I'm going to have to bite the bullet, get my meter out, and produce a proper wiring diagram of what's actually there now before I go any further.