50 VA transformer (24VAC) comes with a 4" x 4" metal mounting plate.
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Q:On the seconday output (24v) screw termainals does the wiring have to be hooked up in a certain way to each screw terminals(left/right) or are both screw terminals common output (reversable)for wiring hook up?
A:It does not matter which way the wiring is hooked up.
Q:How many actuators and thermostats can this transformer be hooked up to run? Doesn't the transformer need to be balanced for the load?
A:This transformer has a 50 VAC capability. The actuators and thermostats you are looking to use in the application will determine how many the transformer can accommodate. If you are using the Wirsbo thermostats, which draws a 5 VAC, then you would be able to connect 10 of them to this transformer. If you were using the Wirsbo Actuators, at 7 VAC, you would be able to connect 7 of them. The 501S by Wirsbo draws 1 VAC per unit, and the 511/512S draws 3 VAC. You would not be able to exceed 50 VAC with this transformer.