Is the blue or brown wire common on 24v side

There is no "common" on the 24 vac side. The 24 vac side (secondary) is electrically isolated from the input side (primary).

Can this be used for 18 volts AC and no more than 1.5 amps

Yes, but not easily. The safe & easy way would be to use a variable transformer: https://www.amazon.com/Mophorn-Variable-Transformer-Voltage-Converter/dp/B07XKXQXWL/ref=sr_1_6?dchild=1&keywords=variable+transformer&qid=1594088888&s=electronics&sr=1-6

Can this be hooked up to both a relay and the c/r for thermostat? If so how?

If you're wanting to energize a relay along with the contactor then that shouldn't be a problem. Make sure the coil of the contactor and relay combined are below the transformer VA capacity and that the relay has a 24vac coil. With that you should be able to connect the relay coil in parallel with the contactor coil.

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Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson

Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson

Product ID: 138876120

Details

Brand
Endurance Pro
Color
Black
Controller Type
touch
Special Feature
Low Voltage

⚡24V Power

🔌Corded Electric

🛠️Easy Installation

Description

🔧 Transform Your Control Game!

RISK FREE PURCHASE - Comes with a 1-year warranty for peace of mind.
DURABLE CONSTRUCTION - Built for industrial applications, ensuring longevity and reliability.
POWERFUL PERFORMANCE - Designed for 24V AC control systems, ensuring reliable operation.
USER FRIENDLY DESIGN - Color-coded leads simplify installation for a hassle-free setup.
VERSATILE COMPATIBILITY - Replaces various transformers with equal or smaller VA ratings.

The Endurance Pro 90-T40F3 Class 2 Transformers Thermostat is a robust and versatile solution for your HVAC needs, designed to operate seamlessly in 24V AC control systems. With easy installation features and a 1-year warranty, it’s the perfect choice for professionals seeking reliability and efficiency.

Specifications

ASIN	B07RS5C41J
Additional Features	Low Voltage
Best Sellers Rank	#855,383 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #711 in Home Thermostat Accessories
Brand Name	Endurance Pro
Color	Black
Connectivity Protocol	BACnet MS/TP
Connectivity Technology	Wired
Control Method	Touch
Control Type	Voice Control
Controller Type	touch
Customer Reviews	4.4 4.4 out of 5 stars (466)
Display Type	touchscreen
Included Components	Foot Mount, Transistor, Diode, Capacitor
Item Weight	1.3 pounds
Manufacturer	Endurance Pro
Manufacturer Part Number	6080-110: 90-T40F3, 40301F
Model Name	Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson
Model Number	90-T40F3, 40301F, 90T40F3
Mounting Type	Foot Mount
Number of Items	1
Power Source	Corded Electric
Product Style	Industrial
Specific Uses For Product	Air Conditioning Circuits, Thermostats, Gas Valves, Relays
Temperature Control Type	Manual
UPC	816325013409
Unit Count	1 Count
Voltage	24 volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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