BC75J-P/Z3 REX 75KVA 600-480/277V 3PH TRANSFORMER

To verify sizing, total up the connected load (in KVA or KW) on the secondary side, then apply a demand factor and add a safety margin of roughly 20–25%. For example, a mix of 480V motor loads and 277V lighting totalling ~60 KVA of demand would be well within the 75 KVA rating of this transformer. If you're unsure, share your load schedule with our team and we can assist with the calculation.

Yes. The 480/277V secondary indicates a 3-phase, 4-wire wye configuration. This gives you 480V line-to-line (for motors and 3-phase equipment) and 277V line-to-neutral (commonly used for commercial fluorescent/LED lighting circuits) from the same transformer simultaneously — a very common arrangement in Canadian commercial and industrial buildings.

Northern Breaker Group specialises in obsolete and hard-to-find electrical equipment, including legacy Rex transformers. If the BC75J-P/Z3 is no longer in active production, we can help locate new-old-stock units or identify a compatible cross-reference from an active manufacturer. Contact our Calgary, Edmonton, or Vancouver counters for availability and a quote.