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    • BA45H-M/Z3 REX 45KVA 480-120/208V 3PH ISO TRANSFORMER

    The BA45H-M/Z3 REX 45KVA 480-120/208V 3PH ISO TRANSFORMER is designed for efficient voltage conversion and isolation in three-phase applications. With robust construction, it offers reliability and enhanced safety for various electrical setups. Ideal for industrial and commercial use, this transformer ensures optimum performance across your operations.

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    SKU REXBA45HMZ3 Categories , ,
    Specifications
    BrandRex
    Voltage480-120/208V
    Frame / SeriesBA45H-M/Z3
    Catalogue #REXBA45HMZ3
    Sizing & Application

    The Rex BA45H-M/Z3 is a 45 kVA three-phase isolation transformer rated for 480V primary / 120–208V secondary, making it well-suited for stepping down facility distribution voltage to standard 120/208V three-phase, four-wire power for commercial and industrial loads. At 45 kVA, it supports a full secondary load of approximately 125A at 208V (3-phase), covering lighting panels, receptacle circuits, HVAC controls, and light machinery.

    • Isolation class: Provides galvanic isolation — ideal for noise-sensitive equipment, medical/lab environments, or where ground fault isolation is required.
    • Typical installation: Mounted upstream of a 120/208V sub-panel or distribution board; ensure enclosure ventilation meets the transformer's ventilation/clearance requirements and CSA/CEC installation rules.
    • Overcurrent protection: Size primary and secondary fusing or breakers per CEC Section 26 transformer protection rules (typically 125% of rated current on the primary).

    Not sure if 45 kVA is the right size for your load, or need to confirm dimensional/mounting details? Send us your project specs and we'll help you confirm suitability.

    At 45 kVA and 208V three-phase, the transformer delivers approximately 125A on the secondary (45,000 ÷ (208 × √3) ≈ 124.9A). This determines the rating of the downstream sub-panel and secondary overcurrent protection you'll need.

    Yes — Rex BA-series isolation transformers are dry-type (no oil/coolant), which makes them suitable for indoor commercial and industrial installations. For Canadian projects, confirm the unit carries CSA or cCSAus certification on its nameplate, as required under the Canadian Electrical Code for permanently installed transformers.

    In many cases, yes — provided the kVA rating, voltage configuration (480V primary, 120/208V secondary), impedance, and physical dimensions are compatible with your existing installation. Because mounting footprints and impedance values can vary between manufacturers, we recommend sending us the nameplate details of the unit you're replacing and we'll confirm cross-compatibility.

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    Experience the advantage of working with Canada's fastest growing electrical supply network—where local expertise meets national capabilities.
    Whether you’re a contractor needing same-day pickup in Calgary, an facility manager sourcing obsolete parts in Edmonton, or a Vancouver electrician requiring marine-rated components, Northern Breaker Group is your trusted electrical supply partner.

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