I don't understand this relay cover.

[kwired]

Probably irrelevant. Class 2 means it has to be under 30V and under 100VA. It just goes to the T-Stat then to the "coil", so if you feed it 240V and get 24V, or you feed it 120V and get 12V, it doesn't matter. That "coil" of the relay is likely a newer "universal" coil that's really a little SMPS that puts out 12VDC for the actual coil, accepting anything from 12-30VAC as the input. That's becoming more and more common now.

Why can't they mark it 120-240 volts then? Marking it 120/240 volts would likely mean you can use either but may need to change a jumper or land on different terminals to change voltage.

 

[hbiss]

That's the same chart as in the Tradeline catalog. I know it's unclear, but what they are saying is that it can control both 120 and 240V loads.

The transformer is always 120V primary.

That "coil" of the relay is likely a newer "universal" coil that's really a little SMPS that puts out 12VDC for the actual coil, accepting anything from 12-30VAC as the input. That's becoming more and more common now.

No. You have to remember that these designs date back to the 40's.

-Hal

 

[kwired]

That's the same chart as in the Tradeline catalog. I know it's unclear, but what they are saying is that it can control both 120 and 240V loads.

The transformer is always 120V primary.



No. You have to remember that these designs date back to the 40's.

-Hal

Back in 40's they maybe would have been marked 110 and or 220 Volts instead of 120 and or 240?

If so they did update that much of the information.