VA (Volt-Amperes) measures a transformer’s apparent power capacity. It tells you how much electrical load a transformer can safely supply.

VA = Volts X Amps

For example, a 24V transformer rated at 100VA can supply approximately 4.17A at 24V.

Choosing the correct VA rating is essential when powering BMS and HVAC equipment, including controllers, actuators, relays and sensors.

• Calculate the total connected load.
• Allow suitable spare capacity.
• Check transformer ratings and manufacturer specifications.
• Avoid overloading your transformer.

At BMS Parts, we help you choose the right components for your building management and HVAC control systems.

🌐 www.bmsparts.co.uk

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