Could I use this transformer plugged into a zwave adapter to trigger a standard a 30A alarm siren?

Probably not, alarm sirens are usually 12 volts DC, this transformer is AC. You would probably need a relay and a DC power supply

Is there a way to know which screw is positive and which one is negative

The output is AC (alternating current). There is neither positive nor negative to such a circuit as there is in a DC output.

I am trying to get power to this antenna motor for a diy automatic door opener on my chicken coop. will this work to power this motor radiotronics hd

If it takes 12 volts Ac and not DC and the current draw isn't too much, It should work. I used one for a long time.

Not possible to calculate from the information given. A 'H' is inductance (Henry) and equal to a Weber divided by Amps or a joule divided by amps squared. A 'MH' is one thousanths of a Henry

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MG Electronics Class II Transformer - 12 Volt AC, 40 VA, UL/CSA Approved : MGT-1240

Product ID: 320792197

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Details

Brand
MG Electronics
Power source
Corded
Mounting type
Floor Mount
Specification met
CSA UL
UPC
759377130260

⚡12V AC output

✅UL/CSA safety certified

🔋40 VA power capacity

Description

⚡ Power up with confidence — transform your tech game!

RELIABLE 12 V AC POWER - Delivers consistent voltage for your critical devices
ROBUST 40 VA CAPACITY - Supports a wide range of applications without compromise
PLUG AND PLAY CONVENIENCE - Easy integration for busy professionals who value efficiency
CERTIFIED SAFETY ASSURANCE - UL/CSA approval guarantees peace of mind and compliance
COMPACT EFFICIENT DESIGN - Saves space while maximizing performance in any setup

The MG Electronics Class II Transformer MGT-1240 provides a stable 12 Volt AC output with a 40 VA capacity, backed by UL and CSA safety certifications. Designed for reliable, efficient power delivery in professional and home environments, it ensures compliance and peace of mind for your electrical projects.

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