BC45H-M/Z3 REX 45KVA 480-120/208V 3PH ISO TRANSFORMER

To confirm sizing, total up your connected load in VA or watts on the 120/208V secondary side and apply a demand factor per your applicable code (Canadian Electrical Code, Part I). A 45 KVA transformer at 208V 3-phase yields approximately 125A of available secondary current. If your calculated demand load exceeds ~80% of that (approx. 100A continuous), you may want to step up to a larger unit. Send us your load schedule and we can advise.

An isolation transformer provides galvanic separation between the primary (480V) and secondary (120/208V) windings. This eliminates a direct electrical path between the two voltage systems, reducing noise, improving safety, and providing a clean derived neutral on the secondary. It is commonly specified for sensitive equipment, data environments, or where the CEC or your engineer requires an isolated derived system. If you are unsure whether isolation is required for your application, consult your engineer or contact our team.

Rex transformers are among the legacy and hard-to-find brands we specialize in at Northern Breaker Group. Whether you need the original BC45H-M/Z3 or a compatible equivalent 45 KVA 480-120/208V 3-phase isolation transformer from a current manufacturer, we can help. Contact our Calgary, Edmonton, or Vancouver counters or submit a quote request and our team will locate the right unit for your project.