BA75H-M/Z3 REX 75KVA 480-120/208V 3PH ISO TRANSFORMER

The BA75H-M/Z3 steps down 480V (3-phase primary) to a 120/208V 3-phase, 4-wire secondary — the standard wye configuration used in Canadian commercial and industrial distribution. It can feed panelboards supplying mixed 120V single-phase loads (lighting, receptacles) and 208V loads (motors, HVAC equipment) up to the 75 KVA transformer rating.

As an isolation transformer, the BA75H-M/Z3 provides galvanic isolation between the 480V primary and the 120/208V secondary. This suppresses noise and transients, protects sensitive equipment, and allows the secondary neutral to be independently grounded at the transformer — a requirement under the Canadian Electrical Code (CEC) when establishing a separately derived system. This is particularly valuable in industrial settings with variable-frequency drives, CNC equipment, or sensitive controls.

Rex transformers, including the BA75H-M/Z3 frame, can be difficult to source as the product line has limited current distribution in Canada. Northern Breaker Group specialises in obsolete and hard-to-find electrical equipment. We can check our inventory across our Calgary, Edmonton, and Vancouver locations, and work to source a direct replacement or equivalent 75 KVA 480-120/208V 3-phase isolation transformer if the original is unavailable. Reach out to our team with your full nameplate details for a quote.