RC75J-B REX 75KVA 600-208V AUTO TRANSFORMER

To verify sizing, calculate your total connected load in KVA at 208V (Amps × 208V × 1.732 for three-phase, ÷ 1000). Your transformer should be rated at or above that figure, with a safety margin of roughly 20–25% recommended for continuous loads. The RC75J-B at 75 KVA is a common fit for mid-size industrial equipment panels — contact us with your load details and we can help confirm it's the right size.

No — the RC75J-B is an autotransformer, meaning the primary and secondary windings share a common electrical connection. It does not provide galvanic isolation between the 600V supply and the 208V output. If your application requires isolation (e.g., for sensitive electronics, certain medical or data environments, or where electrical separation is specified by code), a separate isolation transformer would be required.

Rex transformers, including the RC series, can be difficult to source as the brand has limited current distribution in Canada. Northern Breaker Group specialises in obsolete and hard-to-find electrical equipment — if the RC75J-B is no longer available new, we can help locate new-old-stock (NOS) or a suitable equivalent replacement. Reach out to our Calgary, Edmonton, or Vancouver counters for availability.