At this quick video, I want to talk about a heat sequencer stack, sequencer, whatever you want to call it and how it works, because somebody asked me about it and in the past I may have described it in a way that gave them an idea, because I've Described this between these points, this acts kind of like the coil, would on a contactor between here and here. So you took 24 volts to one side, usually from W, and then you took common to the other side and when that energizes this here, then that opens and closes the contacts up top what's good and pull it apart. So we can actually see what this looks. Like inside and I think, it'll answer a few questions about exactly what I'm talking about here time delay is the time it takes for this bimetallic disc, to snap, open or close and we'll call it a snap action.

Thermodisc or you know, bimetallic disc whatever, but it's actually two different dissimilar metals and the heat at different speeds and that's what allows that action to occur. But you can see that without the pressure from the pins coming from that bimetallic disc, these switches actually go closed. And if you look here, I can just kind of demonstrate that so this is the pen. That's the shorter pen.

This is the bottom contact when that disc applies, that force normally that keeps it open and then, when it snaps it releases and allows the spring to return it, so it's actually a fairly finely rated contact. It's you know you can. You can tell just by looking at the contact paths the points on these, but they're pretty. You know pretty heavy-duty in comparison to what you'd see on a small relay like a 93 48 93 80, or something like that, and that's why a sequencer can handle more current than a typical relay.

Would it's designed for that heat strip current and because of the heater, because it's a heater, not an electromagnet, there's a time delay and that time delay comes in handy tins, drive the contacts. I don't think it's gon na live another day. Alright, thanks for watching alright! So I missed this initially, but this isn't actually the thermo discs and then this sits inside there and that's the disc that actually pushes on the rods that then initially keeps them open. And then, when that heats up that snaps in so it kind of deflects, Bowes inward and then that allows the contacts to close its heat.

Does it not magnetism? So it's resistive, not inductive. You can see the bow in that thing. That's what snaps in and out as it heats up and cools down.