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The BC300J-M/Z3 REX 300KVA ISO Transformer is designed for reliable performance in multiple applications. Operating within a voltage range of 600-120/208V, this 3-phase transformer ensures efficient power conversion and distribution. Ideal for industrial settings, it delivers robust output while enhancing electrical safety and stability for your operations.
A 300 KVA, 600–120/208V 3-phase isolation transformer like the Rex BC300J-M/Z3 is commonly used to step down utility-level 600V service to a usable 120/208V distribution voltage for downstream panelboards, motor control centres, lighting systems, and sensitive equipment. The isolation feature also eliminates electrical noise coupling between primary and secondary circuits, improving power quality and safety — especially important in manufacturing, processing, and data-sensitive environments.
The BC300J-M/Z3 is generally configured for indoor, ventilated or enclosed installation typical of Canadian industrial facilities. If your application requires outdoor or harsh-environment installation, additional enclosure ratings (e.g., NEMA 3R or sealed enclosures) may be required. Contact our team with your installation details and we can advise on the appropriate configuration or enclosure options.
To size a transformer correctly, you need to calculate your total connected load in KVA (volts × amps × √3 for 3-phase), then apply a demand factor and allow for future load growth — a common rule of thumb is to size at 70–80% of transformer capacity under normal operating conditions. For a 300 KVA unit at 208V 3-phase, the full-load secondary current is approximately 833A. If you can share your load schedule or panel specs, our team can help verify whether the BC300J-M/Z3 is correctly sized for your project.
